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用熔融缩聚法合成了一系列聚(对苯二甲酸-1,3-丁二醇酯/对苯二甲酸-1,4-丁二醇酯)/聚乙二醇的嵌段共聚物。用FT-IR,1H-NMR,DSC,TGA,水降解测试等方法表征了材料的结构与性能。FT-IR和1H-NMR分析表明合成得到的共聚物为预期产物;DSC分析显示,共聚聚酯随着1,3-丁二醇在共聚物中比例的增大,熔点(Tm)逐渐降低,由158.24℃下降至104.19℃,玻璃化温度(Tg)逐渐升高,由4.86℃升至24.56℃,合成得到的共聚酯趋向于无定形态;TGA分析表明1,3-丁二醇在共聚酯中比例增大会使聚酯的热稳定性下降,但合成得到的共聚酯依然具有较好的热稳定性,初始分解温度大于310℃,不需要在反应过程中添加热稳定剂;水降解测试结果表明共聚物随1,3-丁二醇比例的增加,降解速率大幅提升。
A series of block copolymers of poly (1,3-butylene terephthalate / 1,4-butylene terephthalate) / polyethylene glycol were synthesized by melt polycondensation. The structure and properties of the materials were characterized by FT-IR, 1H-NMR, DSC, TGA and water degradation test. FT-IR and1H-NMR analysis showed that the synthesized copolymer was the expected product. DSC analysis showed that the melting point (Tm) of the copolyester gradually decreased with the increase of the proportion of 1,3-butanediol in the copolymer, From 158.24 ℃ to 104.19 ℃, the glass transition temperature (Tg) increased gradually from 4.86 ℃ to 24.56 ℃, and the synthesized copolyester tended to be amorphous. TGA analysis showed that 1,3-butanediol Polyester increases the thermal stability of the polyester will decline, but the resulting copolyester still has good thermal stability, the initial decomposition temperature is greater than 310 ℃, do not need to add heat stabilizer during the reaction; water Degradation test results showed that with the increase of the proportion of 1,3-butanediol, the degradation rate of the copolymer increased significantly.