SEMICRYSTALLINE POLYAMIDE ENGINEERING THERMOPLASTICS BASED ON THE RENEWABLE MONOMER, 1,9-NONANE DIAMINE

摘要

A series of poly(l,9-nonamethylene adipamide-co-1,9-nonamethylene .terephthalamide) copolymers were produced using melt polymerization and the thermal properties and crystal structure characterized. The results obtained confirmed that the copolymers exhibit isomorphism. As expected, glass transition temperature and the apparent melting temperature increased with increasing terephthalmide content. Using the difference in the apparent melting temperature to the crystallization temperature as a measure of relative crystallization rate, it was observed that crystallization rate decreased as the terephthalamide content of the copolymer was increased from 0 to 50 mole percent but then sharply increased when increased beyond 50 mole percent. This behavior may be the result of extensive inter- and intramolecular interactions in the melt associated with terethalamide units in the polymer chain that nucleate crystallization upon cooling below the equilibrium melting temperature. Comparing the thermal properties of copolymers possessing an excess of terethalamide units to the commodity polyamide Nylon 6,6, it is believed that these copolymers may have utility as partially renewable engineering thermoplastics.