PTA和CHDM改性聚丁二酸丁二醇酯的性能比较研究

Performance comparison of poly(butylene succinate) modified by PTA and CHDM

将含有苯环的对苯二甲酸(PTA)和六元环的1,4-环己烷二甲醇(1,4-CHDM)引入PBS分子主链中,得到PBS-co-PTA和PBS-co-CHDM的无规共聚物.1 H-NMR鉴定了共聚物为预期产物,并对共聚物的热性能、结晶性和力学性能进行了对比研究.结果表明:PTA和1,4-CHDM改性后共聚物的结晶度变化截然不同,随着PTA含量的增加,PBS-co-PTA的结晶度、结晶尺寸逐渐增大,同时Tg逐渐降低;而随1,4-CHDM含量的增加,PBS-co-CHDM的结晶度和结晶尺寸却减小,Tg逐渐上升.当1,4-CHDM增至30%时,其断裂伸长率可达到PBS的3倍,证明了共聚物PBS-co-CHDM比PBS-co-PTA具有更好的柔韧性.

PBS-co-PTA and PBS-co-CHDM random copolymers are obtained, taking tereph- thalie acid （PTA） containing benzene ring and 1,4-Cyelohexanedimethanol （1,4-CHDM） with six- membered ring into PBS main chain. The product copolymers are identified to be expected by ^1H-NMR, and molecular weight, thermal properties, mechanical performance and degradations of them are also compared. The results show that PTA and 1,4-CHDM modified copolymers present different crystallinities; with increasing contents of PTA, crys- tallinity and crystal size of PBS-co-PTA increase, while Tg gradually reduces; and along with the increase of 1,4-CHDM, erystallinity and crystal size of PBS-co-CHDM decrease, but Tg gradually increases. When the content of 1,4-CHDM is to 30%, the elongation at break of PBS-co-CHDM is three times that of PBS, which proves PBS-co-CHDM has better flexibility than PBS-co-PTA.