含钛三元复合催化剂经熔融缩聚催化乳酸合成高分子量聚乳酸
发布时间：2018-12-17 09:07
【摘要】：构建了一种由四异丙氧基钛(TPT)、对甲基苯磺酸(TSA)和2,2-二羟甲基丙酸(DMPA)组成的三元复合催化体系。利用DMPA结构中双羟基和羧基与TPT有效作用,调节钛的催化活性。TPT/TSA/DMPA构成的复合催化体系在乳酸聚合过程中,TSA瞬时占据中心钛原子空轨道,有效防止了副反应发生。TPT/TSA/DMPA在最优摩尔比情况下,乳酸经熔融聚合可得数均相对分子质量10万、重均相对分子质量在20万以上的聚乳酸。通过核磁氢谱、碳谱、质谱等方法分析了三元复合催化体系可能存在的络合结构和催化乳酸聚合的反应中间阶段。此三元复合催化体系方便易得,其合成操作简单,催化乳酸聚合所得聚乳酸相对分子质量较高,具有较好的发展前景。
[Abstract]:A ternary catalytic system consisting of tetraisopropyl titanium (TPT),) p-methylbenzenesulfonate (TSA) and 2-dimethylolpropionic acid (DMPA) was constructed. The catalytic activity of titanium was regulated by the effective interaction of dihydroxyl and carboxyl groups with TPT in the structure of DMPA. In the process of lactic acid polymerization, TSA occupied the space orbit of titanium atom in the center of the complex system. Under the optimum molar ratio of TPT/TSA/DMPA, poly (lactic acid) with average molecular weight (100000) and weight average molecular weight (200000) can be obtained by melt polymerization. The possible complexation structure and the intermediate stage of the catalytic polymerization of lactic acid were analyzed by means of nuclear magnetic hydrogen spectroscopy, carbon spectrum and mass spectrometry. This ternary complex catalyst system is convenient and easy to obtain, and its synthesis operation is simple, and the molecular weight of polylactic acid obtained by catalytic polymerization of lactic acid is relatively high, which has a good prospect of development.
【作者单位】： 国家能源生物炼制研发中心北京市生物加工过程重点实验室北京化工大学生命科学与技术学院;
【基金】：国家自然科学基金资助项目(21374005,21174013)
【分类号】：O633.14;O643.36
本文编号：2383998
[Abstract]:A ternary catalytic system consisting of tetraisopropyl titanium (TPT),) p-methylbenzenesulfonate (TSA) and 2-dimethylolpropionic acid (DMPA) was constructed. The catalytic activity of titanium was regulated by the effective interaction of dihydroxyl and carboxyl groups with TPT in the structure of DMPA. In the process of lactic acid polymerization, TSA occupied the space orbit of titanium atom in the center of the complex system. Under the optimum molar ratio of TPT/TSA/DMPA, poly (lactic acid) with average molecular weight (100000) and weight average molecular weight (200000) can be obtained by melt polymerization. The possible complexation structure and the intermediate stage of the catalytic polymerization of lactic acid were analyzed by means of nuclear magnetic hydrogen spectroscopy, carbon spectrum and mass spectrometry. This ternary complex catalyst system is convenient and easy to obtain, and its synthesis operation is simple, and the molecular weight of polylactic acid obtained by catalytic polymerization of lactic acid is relatively high, which has a good prospect of development.
【作者单位】： 国家能源生物炼制研发中心北京市生物加工过程重点实验室北京化工大学生命科学与技术学院;
【基金】：国家自然科学基金资助项目(21374005,21174013)
【分类号】：O633.14;O643.36
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