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Answers
Answer: 1.Rayon synthesized first time in 1855.
2.Nylon fibre is stronger than steel wire of same thickness.
3.synthetic fibre catches fire and it starts melting on heating.
4.synthetic fibre do not absorb much sweat.
Explanation:
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Answer:
1. 1800s
2. nylon
3. melts
4. sweat and water
Explanation:
1 .In the 1860s the French silk industry was being threatened by a disease affecting the silkworm. Louis Pasteur and Count Hilaire de Chardonnet were studying this problem with the hope of saving this vital industry. During this crisis, Chardonnet became interested in finding a way to produce artificial silk. In 1885 he patented the first successful process to make a useable fiber from cellulose. Even though other scientists have subsequently developed more cost-effective ways of making artificial silk, Chardonnet is still considered to be the father of rayon.
For the next forty years this material was called artificial or imitation silk. By 1925 it had developed into an industry unto itself and was given the name rayon by the Federal Trade Commission (FTC). The term rayon at this time included any man-made fiber made from cellulose. In 1952, however, the FTC divided rayon into two categories: those fibers consisting of pure cellulose (rayon) and those consisting of a cellulose compound (acetate).
By the 1950s, most of the rayon produced was being used in industrial and home furnishing products rather than in apparel, because regular rayon (also called viscose rayon) fibers were too weak compared to other fibers to be used in apparel. Then, in 1955, manufacturers began to produce a new type of rayon—high-wet-modulus (HWM) rayon—which was somewhat stronger and which could be used successfully in sheets, towels, and apparel. The advent of HWM rayon (also called modified rayon) is considered the most important development in rayon production since its invention in the 1880s.
2. Nylon is a synthetic fiber and has some special chemical properties because of which their fibers are strong. There is amide linkage between the monomers of nylon which make their strings extremely strong. thus nylon net supports heavy weight of fishes.
3. A fiber is made of polymer chains. A polymer chain is made up of monomers. There are bonds between the monomers. There are also bonds between the polymers chains. When polymer melts, the bonds between chains break first while the bonds between monomers remain intact. This happens to thermoplastic synthetic fibers.
4. Generally synthetic fibers are very strong which conveys a sense that they have very strong intermolecular forces of attraction which means that it has very small intermolecular gap and for absorption of water the gap is not large, so generally synthetic fibers do not absorb sweat and other liquids.