CO-NH. Yarn is a long continuous length of interlocked fibres, used in sewing, crocheting, knitting, weaving, embroidery, ropemaking, and the production of textiles. The strongest engineering materials often incorporate fibers, for example carbon fiber and ultra-high-molecular-weight polyethylene.. A map of the British Nylon; Polyester; Acrylic; Rayon. Chemical Properties Nylon 6, 6 fibers is more resistant to acids or alkalis in comparison with nylon 6 fiber because of light intermolecular forces present in the structure. Flax was cultivated and linen used for clothing in Ireland by the 11th century. Felt can be made of natural fibers such as wool or animal fur, or from synthetic fibers such as petroleum-based acrylic or acrylonitrile or wood pulpbased rayon.Blended fibers are also common. It is also known as artificial silk and can be dyed in a wide variety of colours. The strongest engineering materials often incorporate fibers, for example carbon fiber and ultra-high-molecular-weight polyethylene.. Geology is the science and study of the solid and liquid matter that constitutes the Earth. The term polymer in Greek means many parts. It is also known as artificial silk and can be dyed in a wide variety of colours. 3D printing or additive manufacturing is the construction of a three-dimensional object from a CAD model or a digital 3D model. Rayon has properties similar to those of silk. Thread is a type of yarn intended for sewing by hand or machine.Modern manufactured sewing threads may be finished with wax or other lubricants to withstand the stresses involved in sewing. : 2 Nylon polymers can be mixed with a wide variety of additives to achieve many different property variations. Cotton is a soft, fluffy staple fiber that grows in a boll, or protective case, around the seeds of the cotton plants of the genus Gossypium in the mallow family Malvaceae.The fiber is almost pure cellulose, and can contain minor percentages of waxes, fats, pectins, and water.Under natural conditions, the cotton bolls will increase the dispersal of the seeds. What are Polymers? It is infused with cotton or wool to prepare bedsheets and carpets respectively. Nylon was discovered by Wallace Hume Carothers, a chemist hired in 1928 by DuPont It is produced via chain-growth polymerization from the monomer propylene.. Thread is a type of yarn intended for sewing by hand or machine.Modern manufactured sewing threads may be finished with wax or other lubricants to withstand the stresses involved in sewing. Natural fibre felt has special properties that allow it to be used for a wide variety of The Lower Rhine was a center of linen making in the Middle Ages. CBC archives - Canada's home for news, sports, lifestyle, comedy, arts, kids, music, original series & more. Nylons were developed in the 1930s by a research team headed by an American chemist, Wallace H. Carothers, working for E.I. BoPET (biaxially-oriented polyethylene terephthalate) is a polyester film made from stretched polyethylene terephthalate (PET) and is used for its high tensile strength, chemical and dimensional stability, transparency, reflectivity, gas and aroma barrier properties, and electrical insulation.. A variety of companies manufacture boPET and other polyester films under Polypropylene belongs to the group of polyolefins and is partially crystalline and non-polar.Its properties are similar to polyethylene, but it is slightly harder and more heat resistant. Allow it to work for at least one minute, and then scrub with a soft-bristled nylon brush. Many articles like chairs, tables, buckets, toys, balls, etc are made of plastic material. Yarn is a long continuous length of interlocked fibres, used in sewing, crocheting, knitting, weaving, embroidery, ropemaking, and the production of textiles. The braided sheath is usually It is obtained from wood pulp. The term polymer in Greek means many parts. Each manufacturer uses their own method for sizing. Nylon 510 It is obtained from sebacic and pentamethylene diamine acid. Moisture ingress into a laminate can lead to severe loss of properties. To use, start at the top of the shower stall or glass doors and spray on the solution. Polymers range from familiar synthetic plastics such as Synthetic fibers can often be produced very cheaply and in large amounts The British men in the business of colonizing the North American continent were so sure they owned whatever land they land on (yes, thats from Pocahontas), they established new colonies by simply drawing lines on a map. Shake to mix well and label the bottle. A polymer is a large molecule or a macromolecule which essentially is a combination of many subunits. Fiber or fibre (from Latin: fibra) is a natural or artificial substance that is significantly longer than it is wide. A polymer (/ p l m r /; Greek poly-, "many" + -mer, "part") is a substance or material consisting of very large molecules called macromolecules, composed of many repeating subunits. Polyamides contain repeating amide linkages i.e. Many articles like chairs, tables, buckets, toys, balls, etc are made of plastic material. The braided sheath is usually Aramid, Polymers / January 25, 2020 July 7, 2021. Transportation and power generation are the two major uses of petroleum. Nylon; Polyester; Acrylic; Rayon. Uses of Nylon. Rinse with clean water and dry with a lint-free towel. Synthetic fibers can often be produced very cheaply and in large amounts Rayon has properties similar to those of silk. Middle Ages. Clothing Shirts, Foundation garments, lingerie, raincoats, underwear, swimwear and cycle wear. Flax was cultivated and linen used for clothing in Ireland by the 11th century. Nylon 1,6 It is produced from dinitriles with the help of acid catalysis. The pile was traditionally made from wool, but since the 20th century, synthetic fibers such as polypropylene, nylon, or polyester are often used, as these fibers are less expensive than wool. Kevlar fibers have tensile strength twice than Nylon 6,6 ranging from about 2.6 to 4.1 GPa. This versatile cord was used by astronauts during the 82nd Space Shuttle mission to repair the Hubble Space Telescope.. It can be done in a variety of processes in which material is deposited, joined or solidified under computer control, with material being added together (such as plastics, liquids or powder grains being fused), typically layer by layer. Fiberglass (American English) or fibreglass (Commonwealth English) is a common type of fiber-reinforced plastic using glass fiber.The fibers may be randomly arranged, flattened into a sheet called a chopped strand mat, or woven into glass cloth.The plastic matrix may be a thermoset polymer matrixmost often based on thermosetting polymers such as epoxy, polyester resin, Moisture ingress into a laminate can lead to severe loss of properties. The fiber is unaffected by most mineral acids, except hot mineral acids. This is the web site of the International DOI Foundation (IDF), a not-for-profit membership organization that is the governance and management body for the federation of Registration Agencies providing Digital Object Identifier (DOI) services and registration, and is the registration authority for the ISO standard (ISO 26324) for the DOI system. Rayon - Meaning, Properties, Uses, Sources, and FAQs. The mechanical properties of different grades are given in the table below: Grade Density (g/cm3) Nylon is often used in gears, bushings, and plastic bearings because of its inherent low-friction properties. du Pont de Nemours & Company. Kevlar Uses, properties and processing. It is a man-made fibre and cheaper than silk. Aramid, Polymers / January 25, 2020 July 7, 2021. The successful production of a useful fibre by chemical What is Polyamide (Nylon)? Thermoplastic polyurethane (TPU) is any of a class of polyurethane plastics with many properties, including elasticity, transparency, and resistance to oil, grease, and abrasion.Technically, they are thermoplastic elastomers consisting of linear segmented block copolymers composed of hard and soft segments. Uses of Nylon. Fiber or fibre (from Latin: fibra) is a natural or artificial substance that is significantly longer than it is wide. By the Middle Ages, there was a thriving trade in German flax and linen.The trade spread throughout Germany by the 9th century and spread to Flanders and Brabant by the 11th century. Mechanical properties Elongation at break 2040% Notch test 25 kJ/m 2: Glass Transition Temperature: 82 C (180 F) as it does not decompose and is weather-resistant. Wool, along with cotton and to lesser extent nylon, is a fibre that absorbs moisture from the surrounding air to reach an equilibrium, which depends on the relative humidity of the environment. Polymers - Types, Classification, Properties, and Uses of Polymers. Fibers are often used in the manufacture of other materials. For example, nylon-6, 6, polyethers etc. A polymer (/ p l m r /; Greek poly-, "many" + -mer, "part") is a substance or material consisting of very large molecules called macromolecules, composed of many repeating subunits. Fibers are often used in the manufacture of other materials. Thermoset Type: Common Uses: Alkyl (polyester) polypropylene, polyvinyl chloride, polystyrene, polybenzimidazole, acrylic, nylon, and Teflon. BoPET (biaxially-oriented polyethylene terephthalate) is a polyester film made from stretched polyethylene terephthalate (PET) and is used for its high tensile strength, chemical and dimensional stability, transparency, reflectivity, gas and aroma barrier properties, and electrical insulation.. A variety of companies manufacture boPET and other polyester films under Felt can be made of natural fibers such as wool or animal fur, or from synthetic fibers such as petroleum-based acrylic or acrylonitrile or wood pulpbased rayon.Blended fibers are also common. Nylon 510 It is obtained from sebacic and pentamethylene diamine acid. Nylon was discovered by Wallace Hume Carothers, a chemist hired in 1928 by DuPont Thermoset Type: Common Uses: Alkyl (polyester) polypropylene, polyvinyl chloride, polystyrene, polybenzimidazole, acrylic, nylon, and Teflon. Properties of Plastics. This is the web site of the International DOI Foundation (IDF), a not-for-profit membership organization that is the governance and management body for the federation of Registration Agencies providing Digital Object Identifier (DOI) services and registration, and is the registration authority for the ISO standard (ISO 26324) for the DOI system. Wool, along with cotton and to lesser extent nylon, is a fibre that absorbs moisture from the surrounding air to reach an equilibrium, which depends on the relative humidity of the environment. Mechanical properties Elongation at break 2040% Notch test 25 kJ/m 2: Glass Transition Temperature: 82 C (180 F) as it does not decompose and is weather-resistant. What are Polymers? Shake to mix well and label the bottle. CBC archives - Canada's home for news, sports, lifestyle, comedy, arts, kids, music, original series & more. Parachute cord (also paracord or 550 cord when referring to type-III paracord) is a lightweight nylon kernmantle rope originally used in the suspension lines of parachutes.This cord is now used as a general purpose utility cord. Fiberglass (American English) or fibreglass (Commonwealth English) is a common type of fiber-reinforced plastic using glass fiber.The fibers may be randomly arranged, flattened into a sheet called a chopped strand mat, or woven into glass cloth.The plastic matrix may be a thermoset polymer matrixmost often based on thermosetting polymers such as epoxy, polyester resin, What are Polymers? Evidence suggests that flax may Geology is the science and study of the solid and liquid matter that constitutes the Earth. The primary element of CFRP is a carbon filament; this is produced from a precursor polymer such as polyacrylonitrile (PAN), rayon, or petroleum pitch.For synthetic polymers such as PAN or rayon, the precursor is first spun into filament yarns, using chemical and mechanical processes to initially align the polymer chains in a way to enhance the final physical properties of the Kevlar fibers have tensile strength twice than Nylon 6,6 ranging from about 2.6 to 4.1 GPa. Properties of Wool Fibers. Nylons were developed in the 1930s by a research team headed by an American chemist, Wallace H. Carothers, working for E.I. Allow it to work for at least one minute, and then scrub with a soft-bristled nylon brush. Polymers - Types, Classification, Properties, and Uses of Polymers. This versatile cord was used by astronauts during the 82nd Space Shuttle mission to repair the Hubble Space Telescope.. It is infused with cotton or wool to prepare bedsheets and carpets respectively. A map of the British Rinse with clean water and dry with a lint-free towel. 3D printing or additive manufacturing is the construction of a three-dimensional object from a CAD model or a digital 3D model. They are light in weight and are chemically stable. Polyamides or Nylon is a major high performance engineering thermoplastics class because of its good balance of properties. Cotton is a soft, fluffy staple fiber that grows in a boll, or protective case, around the seeds of the cotton plants of the genus Gossypium in the mallow family Malvaceae.The fiber is almost pure cellulose, and can contain minor percentages of waxes, fats, pectins, and water.Under natural conditions, the cotton bolls will increase the dispersal of the seeds. Natural fibres (such as flax, wool, hemp, and cotton) have been utilised for textile (woven products) for a very long time. Properties of Plastics. Properties of Wool Fibers. Other uses include fascia, and siding or weatherboarding. CO-NH. Fiberglass (American English) or fibreglass (Commonwealth English) is a common type of fiber-reinforced plastic using glass fiber.The fibers may be randomly arranged, flattened into a sheet called a chopped strand mat, or woven into glass cloth.The plastic matrix may be a thermoset polymer matrixmost often based on thermosetting polymers such as epoxy, polyester resin, It is a man-made fibre and cheaper than silk. The pile usually consists of twisted tufts that are typically heat-treated to maintain The field of geology encompasses the study of the composition, structure, physical properties, dynamics, and history of Earth materials, and the processes by which they are formed, moved, and changed.The field is a major academic discipline, and is also important for mineral and A carpet is a textile floor covering typically consisting of an upper layer of pile attached to a backing. Clothing Shirts, Foundation garments, lingerie, raincoats, underwear, swimwear and cycle wear. Rinse with clean water and dry with a lint-free towel. Nylon is a silk-like thermoplastic, generally made from petroleum, that can be melt-processed into fibers, films, or shapes. CBC archives - Canada's home for news, sports, lifestyle, comedy, arts, kids, music, original series & more. This versatile cord was used by astronauts during the 82nd Space Shuttle mission to repair the Hubble Space Telescope.. Fibers are often used in the manufacture of other materials. The successful production of a useful fibre by chemical Polyamides or Nylon is a major high performance engineering thermoplastics class because of its good balance of properties. It is also known as artificial silk and can be dyed in a wide variety of colours. Aside from PLA ABS, TPE filaments, there are metal, nylon, sandstone, magnet, carbon fiber and even glow in the dark filaments. The pile usually consists of twisted tufts that are typically heat-treated to maintain For example, nylon-6, 6, polyethers etc. The British men in the business of colonizing the North American continent were so sure they owned whatever land they land on (yes, thats from Pocahontas), they established new colonies by simply drawing lines on a map. Chemicals obtained from the refining of crude oil and the processing of natural gas are used by the petrochemical industry to produce petrochemicals like synthetic rubber, fertilizers, plastic, latex paints, drugs, synthetic fibres, and explosives. Easily moulded into different shapes and sizes. The mechanical properties of different grades are given in the table below: Grade Density (g/cm3) Properties of Petroleum It can be done in a variety of processes in which material is deposited, joined or solidified under computer control, with material being added together (such as plastics, liquids or powder grains being fused), typically layer by layer. du Pont de Nemours & Company. Even when buying different styles from the same manufacturer, the materials used may have different stretch properties which can alter the fit dramatically. Thread is a type of yarn intended for sewing by hand or machine.Modern manufactured sewing threads may be finished with wax or other lubricants to withstand the stresses involved in sewing. Silicone rubber is a high-performance elastomer characterized by an unusual combination of properties. The mechanical properties of different grades are given in the table below: Grade Density (g/cm3) Polypropylene belongs to the group of polyolefins and is partially crystalline and non-polar.Its properties are similar to polyethylene, but it is slightly harder and more heat resistant. The Lower Rhine was a center of linen making in the Middle Ages. These properties range from high-temperature performance to durability, excellent electrical insulation properties as well as its transparency. Due to their broad spectrum of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life. A polymer is a large molecule or a macromolecule which essentially is a combination of many subunits. Nylon is a man-made synthetic fiber that is strong while very light in weight, properties that lead to a wide variety of uses, such as fabric, rope and luggage.This fiber was first introduced in the 1930s as an early substitute for silk; it eventually became the fiber of choice for women's stockings. It is infused with cotton or wool to prepare bedsheets and carpets respectively. Nylon is a generic designation for a family of synthetic polymers composed of polyamides (repeating units linked by amide links). Kevlar fibers have tensile strength twice than Nylon 6,6 ranging from about 2.6 to 4.1 GPa. It is a man-made fibre and cheaper than silk. Geology is the science and study of the solid and liquid matter that constitutes the Earth. Nylon 66 Wallace Carothers patented nylon 66 with the use of amide. nylon, any synthetic plastic material composed of polyamides of high molecular weight and usually, but not always, manufactured as a fibre. Other uses include fascia, and siding or weatherboarding. Chemicals obtained from the refining of crude oil and the processing of natural gas are used by the petrochemical industry to produce petrochemicals like synthetic rubber, fertilizers, plastic, latex paints, drugs, synthetic fibres, and explosives. The best 3D printer filament depends on the object one prints because filaments have different properties making one more appropriate over the others in a particular application. Thermoset Type: Common Uses: Alkyl (polyester) polypropylene, polyvinyl chloride, polystyrene, polybenzimidazole, acrylic, nylon, and Teflon. Polyamides or Nylon is a major high performance engineering thermoplastics class because of its good balance of properties. Parachute cord (also paracord or 550 cord when referring to type-III paracord) is a lightweight nylon kernmantle rope originally used in the suspension lines of parachutes.This cord is now used as a general purpose utility cord. The fiber is unaffected by most mineral acids, except hot mineral acids. The DOI system provides a Many articles like chairs, tables, buckets, toys, balls, etc are made of plastic material. Easily moulded into different shapes and sizes. Different types of plastics are known to possess different physical and chemical properties. Polymers range from familiar synthetic plastics such as Password requirements: 6 to 30 characters long; ASCII characters only (characters found on a standard US keyboard); must contain at least 4 different symbols; Uses of Nylon. The Lower Rhine was a center of linen making in the Middle Ages. Properties of Plastics. Nylon; Polyester; Acrylic; Rayon. The primary element of CFRP is a carbon filament; this is produced from a precursor polymer such as polyacrylonitrile (PAN), rayon, or petroleum pitch.For synthetic polymers such as PAN or rayon, the precursor is first spun into filament yarns, using chemical and mechanical processes to initially align the polymer chains in a way to enhance the final physical properties of the Shake to mix well and label the bottle. Silicone rubber is a high-performance elastomer characterized by an unusual combination of properties. Middle Ages. Where one might take the wearer's height and hip size into account, another may calculate the best fit using height and weight. A carpet is a textile floor covering typically consisting of an upper layer of pile attached to a backing. A carpet is a textile floor covering typically consisting of an upper layer of pile attached to a backing. This is the web site of the International DOI Foundation (IDF), a not-for-profit membership organization that is the governance and management body for the federation of Registration Agencies providing Digital Object Identifier (DOI) services and registration, and is the registration authority for the ISO standard (ISO 26324) for the DOI system. Felt is a textile material that is produced by matting, condensing and pressing fibers together. Thermoplastic polyurethane (TPU) is any of a class of polyurethane plastics with many properties, including elasticity, transparency, and resistance to oil, grease, and abrasion.Technically, they are thermoplastic elastomers consisting of linear segmented block copolymers composed of hard and soft segments. Aside from PLA ABS, TPE filaments, there are metal, nylon, sandstone, magnet, carbon fiber and even glow in the dark filaments. The term polymer in Greek means many parts. Rayon - Meaning, Properties, Uses, Sources, and FAQs. Nylon 1,6 It is produced from dinitriles with the help of acid catalysis. They are light in weight and are chemically stable. Nylon was discovered by Wallace Hume Carothers, a chemist hired in 1928 by DuPont A map of the British What is Polyamide (Nylon)? Mechanical properties Elongation at break 2040% Notch test 25 kJ/m 2: Glass Transition Temperature: 82 C (180 F) as it does not decompose and is weather-resistant. Due to their broad spectrum of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life. Even when buying different styles from the same manufacturer, the materials used may have different stretch properties which can alter the fit dramatically. Moisture ingress into a laminate can lead to severe loss of properties. Kevlar Uses, properties and processing. Polymers can be found all around us. Nylon 66 Wallace Carothers patented nylon 66 with the use of amide. Thermoplastic polyurethane (TPU) is any of a class of polyurethane plastics with many properties, including elasticity, transparency, and resistance to oil, grease, and abrasion.Technically, they are thermoplastic elastomers consisting of linear segmented block copolymers composed of hard and soft segments. It is formed by condensing identical units, copolymers with different units. : 2 Nylon polymers can be mixed with a wide variety of additives to achieve many different property variations. To use, start at the top of the shower stall or glass doors and spray on the solution. Flax was cultivated and linen used for clothing in Ireland by the 11th century. By the Middle Ages, there was a thriving trade in German flax and linen.The trade spread throughout Germany by the 9th century and spread to Flanders and Brabant by the 11th century. Yarn is a long continuous length of interlocked fibres, used in sewing, crocheting, knitting, weaving, embroidery, ropemaking, and the production of textiles. 3D printing or additive manufacturing is the construction of a three-dimensional object from a CAD model or a digital 3D model. BoPET (biaxially-oriented polyethylene terephthalate) is a polyester film made from stretched polyethylene terephthalate (PET) and is used for its high tensile strength, chemical and dimensional stability, transparency, reflectivity, gas and aroma barrier properties, and electrical insulation.. A variety of companies manufacture boPET and other polyester films under Uses Thermoplastic Polymers. Nylon is often used in gears, bushings, and plastic bearings because of its inherent low-friction properties. Properties of Petroleum Rayon - Meaning, Properties, Uses, Sources, and FAQs. Felt is a textile material that is produced by matting, condensing and pressing fibers together. The DOI system provides a Evidence suggests that flax may Nylon is often used in gears, bushings, and plastic bearings because of its inherent low-friction properties. Polymers range from familiar synthetic plastics such as Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. It is obtained from wood pulp. The best 3D printer filament depends on the object one prints because filaments have different properties making one more appropriate over the others in a particular application. It is produced via chain-growth polymerization from the monomer propylene.. The pile usually consists of twisted tufts that are typically heat-treated to maintain Chemical Properties Nylon 6, 6 fibers is more resistant to acids or alkalis in comparison with nylon 6 fiber because of light intermolecular forces present in the structure. The best 3D printer filament depends on the object one prints because filaments have different properties making one more appropriate over the others in a particular application. Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. What is Polyamide (Nylon)? Different types of plastics are known to possess different physical and chemical properties. Polymers can be found all around us. Uses Thermoplastic Polymers. Each manufacturer uses their own method for sizing. Other uses include fascia, and siding or weatherboarding. Rayon has properties similar to those of silk. By the Middle Ages, there was a thriving trade in German flax and linen.The trade spread throughout Germany by the 9th century and spread to Flanders and Brabant by the 11th century. Easily moulded into different shapes and sizes. Basalt fiber is a material made from extremely fine fibers of basalt, which is composed of the minerals plagioclase, pyroxene, and olivine.It is similar to fiberglass, having better physicomechanical properties than fiberglass, but being significantly cheaper than carbon fiber.It is used as a fireproof textile in the aerospace and automotive industries and can also be used Password requirements: 6 to 30 characters long; ASCII characters only (characters found on a standard US keyboard); must contain at least 4 different symbols; Fiber or fibre (from Latin: fibra) is a natural or artificial substance that is significantly longer than it is wide. Transportation and power generation are the two major uses of petroleum. The successful production of a useful fibre by chemical Natural fibre felt has special properties that allow it to be used for a wide variety of Nylon is not the most slippery plastic available - typically, we recommend acetal if low friction is the only consideration. Then, everyone living in the now-claimed territory, became a part of an English colony. Nylon is not the most slippery plastic available - typically, we recommend acetal if low friction is the only consideration. They are light in weight and are chemically stable. du Pont de Nemours & Company. A polymer (/ p l m r /; Greek poly-, "many" + -mer, "part") is a substance or material consisting of very large molecules called macromolecules, composed of many repeating subunits. Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. It can be done in a variety of processes in which material is deposited, joined or solidified under computer control, with material being added together (such as plastics, liquids or powder grains being fused), typically layer by layer. Parachute cord (also paracord or 550 cord when referring to type-III paracord) is a lightweight nylon kernmantle rope originally used in the suspension lines of parachutes.This cord is now used as a general purpose utility cord. The primary element of CFRP is a carbon filament; this is produced from a precursor polymer such as polyacrylonitrile (PAN), rayon, or petroleum pitch.For synthetic polymers such as PAN or rayon, the precursor is first spun into filament yarns, using chemical and mechanical processes to initially align the polymer chains in a way to enhance the final physical properties of the It is obtained from wood pulp. Synthetic fibers can often be produced very cheaply and in large amounts The field of geology encompasses the study of the composition, structure, physical properties, dynamics, and history of Earth materials, and the processes by which they are formed, moved, and changed.The field is a major academic discipline, and is also important for mineral and Chemicals obtained from the refining of crude oil and the processing of natural gas are used by the petrochemical industry to produce petrochemicals like synthetic rubber, fertilizers, plastic, latex paints, drugs, synthetic fibres, and explosives. Then, everyone living in the now-claimed territory, became a part of an English colony. Nylon is a man-made synthetic fiber that is strong while very light in weight, properties that lead to a wide variety of uses, such as fabric, rope and luggage.This fiber was first introduced in the 1930s as an early substitute for silk; it eventually became the fiber of choice for women's stockings.