基于环己烷二甲醇和低聚乳酸制备脂肪/芳香共聚酯

通过对苯二甲酸二甲酯(DMT)，1,6-己二醇(HDO)，以及1,4-环己烷二甲醇(CHDM)和-羟基--羧基DL-低聚乳酸(OLA)在催化剂钛酸四丁酯下熔融缩聚合成了一系列可生物降解共聚酯PHCTL。通过核磁共振(1H NMR)，差示扫描量热法(DSC)，热重分析法(TG)和广角X射线衍射(WAXS)技术对共聚酯进行了表征，随着CHDM含量的增加，共聚酯的熔点(Tm)，热分解温度(Td)等都有了明显的增加。凝胶渗透色谱(GPC)分析得出共聚酯的分子量在1.7-3.6  x104之间。在37 C下 PHCTL共聚酯发生了明显的降解，降解速率的大小与共聚酯的亲水性有关。

Preparation of Aliphatic/Aromatic Copolyesters Based on Cyclohexanedimethanol and Oligo(lactic acid)

A new biodegradable copolyester was synthesized via polycondensation from dimethyl terephthalate (DMT), 1,6-hexanediol (HDO), 1,4-cyclohexanedimethanol (CHDM) and oligo(lactic acid) (OLA) in the presence of activator tetrabutyl titanate. The resulting copolyesters, PHCTL, were characterized by proton nuclear magnetic resonance (1H NMR), differential scanning calorimetry (DSC), thermogravimetry (TG) and wide-angle X-ray scattering (WAXS). The melting temperature (Tm) and thermal decomposition temperature (Td) of the copolyesters increased obviously with increasing content of CHDM. The molecular weights of copolyesters were found to be varied in the range of 1.7-3.6 x 104 g/mol. The degradation rates of copolyesters were dependent on their hydrophilicity.