聚丁二酸丁二醇酯的合成

Synthesis of poly(butylene succinate)

通过直接酯化缩聚法,以丁二酸、丁二醇为原料,合成了相对分子质量较高的聚丁二酸丁二醇酯(PBS),并首次采用折光率法研究了PBS酯化反应中的副反应。结果表明:酯化反应中,酸醇比、反应温度及催化剂对酯化率的影响较大;随着丁二醇加入量的增加,酯化反应中的副反应增强,随着反应温度的升高也增强;缩聚反应所合成PBS的黏均摩尔质量在5.7×104～8.0×104 g/mol之间,且在酯化反应温度为150℃,酸醇比为1∶1.2,采用钛系催化剂,其用量为所加入丁二酸的0.1%(物质的量比),缩聚反应温度为220℃时,所得产物分子质量最高。

A poly（butylene succinate）（PBS） with higher relative molecular weight was synthesized by direct esterification-polycondensation of succinic acid（SA） and 1,4-butanediol（BD）,and it was the first time to investigate the side reaction of esterification in PBS by using refractometric analysis.The results showed that the esterification rate was significantly affected by SA/BD ratio,temperature and catalysts.The side reaction increased with the increase of the amount of BD and rising of the temperature.The viscosity-average molecular weight of the synthesized PBS was from 5.7×104 g/mol to 8.0×104 g/mol,and the highest molecular weight PBS was obtained when the esterification temperature was 150 ℃,SA/BD ratio was 1∶1.2,the amount of titanium catalyst was 0.1% of SA（mole ratio）,and the temperature of polycondensation was 220 ℃.