抄録
Polyethylene terephthalate copolymers were prepared by substitutions with adipic acid up to 30 mol% for the purpose of producing processable polyester fibers easily weight-reduced by alkali.
Melting temperature, glass transition temperature and cold crystallization temperature measured by DTA for the melt-quenched samples decreased with increasing comonomer (adipic acid) content. Density and crystallinity of the hot-pressed films increased with increasing comonomer content. As the comonomer content increased, the rate constant of dissolution of the copolymer measured by hydrolysis in 10% NaOH aqueous solution at 80°C increased up to the comonomer content of 5 mol%, decreased up to 10 mol%, and then increased up to 30 mol%. This irregular change was also observed for the rate constant of disperse dye absorption measured by dyeing at 80°C. By the copolymerization, the tensile elongation of the hot-pressed films decreased for the copolymers with the comonomer content of 5 and 10 mol% and increased remarkably for that with 30 mol% as compared with polyethylene terephthalate. Heat resistance estimated by TG was little affected by the copolymerization.
