【摘要】 利用4种不同的脂肪族二元醇(乙二醇、1,3-丙二醇、1,4-丁二醇、1,6-己二醇)与己二酸和对苯二甲酸二甲酯制备出4种不同脂肪/芳香比的共聚酯:(对苯二甲酸乙二醇-co-己二酸乙二醇)共聚酯(PETA)、(对苯二甲酸丙二醇-co-己二酸丙二醇)共聚酯(PPTA)、(对苯二甲酸丁二醇-co-己二酸丁二醇)共聚酯(PBTA)和(对苯二甲酸己二醇-co-己二酸己二醇)共聚酯(PHTA),并比较了它们的热性能和生物降解性能。结果表明:相同二元醇、不同脂肪/芳香物质的量比的共聚酯,随脂肪族单体含量的增加,玻璃化转变温度(Tg)单调降低,熔点(Tm)降低,生物降解能力增加;相同脂肪/芳香物质的量的比、不同二元醇制备的共聚酯,Tg随二元醇碳原子的增加而单调下降,Tm变化顺序为:Tm(PPTA)>Tm(PBTA)>Tm(PHTA)>Tm(PETA),1,3-丙二醇体系的共聚酯具有最佳的耐热性能;生物降解能力随二元醇单体碳原子数的增加而增加。更多还原

【Abstract】 Linear aliphatic/aromatic copolyesters have been synthesized. using dimethyl terephthalate,adipic acid and four diols (ethylene glycol,1,3-propanediol,1,4-butanediol,and 1,6-hexanediol) with different aliphatic/aromatic feed molar ratios. The thermal properties and biodegradabilities of poly(ethylene terephthalate-co-ethylene adipate) (PETA),poly(propylene terephthalate-co-propylene adipate) (PPTA),poly(butylene terephthalate-co-butylene adipate) (PBTA) and poly(hexylene terephthalate-co-hexylene adipate) (PHTA) were studied. For copolyesters prepared from the same diol but with different feed molar ratios,the glass transition temperature (Tg) decreased monotonically and both the melting temperature (Tm) and biodegradabilities increased with increasing content of aliphatic unit. As far as copolyesters with the same aliphatic/aromatic feed molar ratios but prepared from different diols are concerned,the biodegradabilities increased and Tg decreased with the increasing number of carbon atoms in the aliphatic diol. The value of Tm was found to decrease in the order Tm (PPTA)>Tm (PBTA)>Tm (PHTA)>Tm(PETA),indicating that PPTA has the best thermal properties.更多还原