PA is considered the first engineering thermoplastic
PA is one of many heterochain thermoplastics, which has atoms other than C in the chain.
PA invented in 1928 by Wallace Carothers, DuPont, in search of a “super polyester” fiber with molecular weights greater than 10,000. First commercial nylon in 1938.
PA was created when a condensation reaction occurred between amino acids, dibasic acids, and diamines.
Nylons are described by a numbering system which indicates the number of carbon atoms in the monomer chains
- Amino acid polymers are designated by a single number, as nylon 6
- Diamines and dibasic acids are designated with 2 numbers, the first representing the diamine and the second indicating the adipic acid, as in nylon 6,6 or nylon 6,10 with sebacic acid.