文章摘要
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
High Molecular Weight Poly(L-lactic acid) Synthesized by Condensation Polymerization of L-Lactic Acid Under the Ternary Composite Catalyst
  
DOI:10.16865/j.cnki.1000-7555.2017.12.001
中文关键词: 聚乳酸  钛类催化剂  熔融缩聚  复合催化
英文关键词: poly(lactic acid)  titanium catalyst  melt polycondensation  ternary composite catalyst
基金项目:国家自然科学基金资助项目(21374005,21174013)
作者单位
陈黎明, 韩在祺, 庞 帅, 杨 晶 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北京 100029 
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中文摘要:
      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。
英文摘要:
      In this study, one type of ternary composite catalysts including tetraisopropyl titanate (TPT), p-toluenesulfonic acid (TSA) and 2,2-dihydroxy propionic acid (DMPA) was developed for polymerization of lactic acid (LA). The activity of central metal titanium was efficiently adjusted by the interaction between DMPA and TPT. During the process of LA polymerization, TSA instantaneously occupied the vacant orbital, which efficiently decreased the side reactions of the polymerization. DMPA which complexed with Ti participated into the polymerization of LA, benefiting to significant enhancement of the final molecular weight. Under the catalysis of TPT/TSA/DMPA with optimal mole ratio (1∶3∶5), the average molecular weight of PLA is over 20×104. The structures of complex catalysis and the polymer were measured by 1H-NMR, 13C-NMR and DEPT 135, and the probable intermediate of polymerization was deduced. This ternary composite catalyst provides one promising to realize synthesis of PLA with high molecular weight by melt polymerization.
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