What is the history of nylon's R & D?

According to the China market research online to understand Nylon is a distinguished scientist Carothers and the United States under the leadership of a research group developed , what's that is the world 's first synthetic fiber appears . The emergence of nylon textile new look, and its synthesis is a major breakthrough in synthetic fiber industry , but also an important milestone in polymer chemistry .
Market research shows that polyamide fiber called Nylon, is the molecular main chain containing repeated amide groups - [NHCO] - thermoplastic resins general. Include aliphatic PA, aliphatic - aromatic PA and aromatic PA. Among them, aliphatic PA varieties, yield, widely used , and its name from a synthetic monomer specific number of carbon atoms may be. Is a famous American chemist Carothers and his research team invented. Nylon is a polyamide fibers ( nylon ) is an argument can be made ​​or staple fiber growth .

In 1928, the largest U.S. chemical industry ─ ─ DuPont company established a foundation for Chemistry Research Institute, only 32 years old , Dr. Carothers hired as the head of the Institute . His main polymerization studies. He studied first bifunctional molecules polycondensation reaction , dihydric alcohol and dicarboxylic acid by esterification condensation of synthetic long -chain, high molecular weight polyesters. In less than two years time , Carothers in the preparation of linear polymers especially polyester , has made important progress , the relative molecular mass of the polymer increased to 10,000 ~ 25,000 , he put the relative molecular quality than 10,000 polymer called Superpolymer. 1930 , Carothers assistant found diol and dicarboxylic acid by polycondensation reaction of high polyester , it can be like molten material out of the system as silk to cotton candy , and this fibrous filaments even after cooling, can continue to stretch , stretching the length can reach several times the original , after cooling the stretched fiber strength , flexibility , transparency and gloss are greatly increased . The peculiar nature of this polyester premonition that they may have significant commercial value , it is possible to use molten polymer is spun fibers. However, continued research shows that to get from polyester fibers has only theoretical significance. Because of the high polyesters that melt below 100 ℃ , particularly soluble in various organic solvents , but also slightly more stable in water and is therefore not suitable for textile .

Beacuse of  Carothers again with a series of polyester and polyamide compounds conducted in-depth research . After careful comparison , selected in his February 28, 1935 for the first time by the synthesis of hexamethylene diamine and adipic acid polyamide 66 ( first 6 shows the number of carbon atoms in the diamine , the second 6 represents the diacid carbon atoms ) . This polyamide is not soluble in common solvents , a melting point of 263 ℃, higher than generally used ironing temperature , the drawn fiber yarn appearance and gloss, but also in the structure and properties similar to natural silk, its wear resistance and strength over time any kind of fiber . Its nature and manufacturing costs into account , the polyamide known it is the best choice . Then , DuPont and solve the industrial production of polyamide 66 sources of raw materials , 27 October 1938 announced the birth of the world's first synthetic fiber and synthetic polyamide 66 which is named Nylon. Nylon was in English become " from coal , air, water, or other synthetic material having abrasion resistance and flexibility, chemical structure similar proteins in general all polyamides ."