2,5-ジクロロテレフタル酸からのポリアミドおよびポリエステル

抄録

Polyamides were prepared from 2, 5-dichloroterephthalic acid with hexamethylenediamine, ethylenediamine, piperazine, 2, 5-dimethylpiperazine, p-phenylenediamine, m-phenylenediamine, 4, 4′-diaminodiphenylether, 4, 4′-diaminodiphenylmethane or 4, 4′-diaminodiphenylsulfone. Polyesters were also prepared from 2, 5-dichloro-terephthalic acid with bisphenol-A, resorcinol, hydroquinone or ethylene glycol. Synthesis and properties of these chlorinated polymers were compared with those of non-chlorinated polymers prepared from terephthalic acid to examine the effect of chlorine substitution.
η_SP/C of polymers obtained by the interfacial or low temperature solution polymerization method decreased by chlorine substitution. Crystallinity, melting point and decomposition starting point measured by DTA also decreased by chlorine substitution. The ratio of melting point (°K) of chlorinated to non-chlorinated polymer was about 0.92 for polyamides having flexible chain, and was smaller for polyamides having rigid chain and for polyesters having no intermolecular hydrogen bond. Effect of chlorine substitution on TG curves was remarkable for nylon-6T and was little for PET, while chlorinated PET was self-extinguishing when removed from a flame. Chlorinated polymers had better solubility to organic solvents.