1983 Volume 40 Issue 10 Pages 609-613
Nylon 66-61 copolymers (I, isophthalic acid) and nylon 66-MXD6 copolymers (MXD, m-xylylene diamine) were prepared by melt polycondensation (MP) and by interfacial polycondensation (IP) using CCl4 as organic solvent. Melting temperature (Tm), glass-transition temperature (Tg), and cold crystallization temperature (Tcc) of the copolymers were measured by a differential thermal analyzer. Density measurement, X-ray analysis, and dynamic viscoelasticity measurement were carried out for films prepared by casting from formic acid solutions. The copolymers prepared by IP had lower Tm and higher Tg, Tcc, and dynamic modulus than the copolymers prepared by MP. These results indicated that the copolymers prepared by IP form a block structure which enhanced the rigidity of copolymer chains. The 6I copolymers had lower Tm and higher Tg, Tcc, and dynamic modulus than the MXD6 copolymers, which suggested the effect of benzene ring adjacent to amide group on the rigidity of copolymer chains.
