摘要
为了探索在乳酸直接缩聚过程中调控聚合度及端基类型的方法和开辟通过直接缩聚合成聚乳酸基功能高分子的新领域,以乙二醇为例,对二元醇存在条件下的乳酸直接缩聚进行了研究。通过1 H NMR对产物的结构进行了表征,通过测定质量及黏度对反应过程进行了跟踪。实验结果表明,加入乙二醇后,由于羟基与羧基官能团相对量的改变,对聚乳酸聚合度具有调控作用。通过实验研究得出了添加乙二醇条件下的理论聚合度的计算方法。本研究为通过直接缩聚合成具有特定聚合度的遥爪型聚乳酸大分子单体,进而合成聚乳酸基功能高分子奠定了基础。
In order to explore the method of regulating poly（lactic acid） polymerization degree and end group type in the process of lactic acid direct polycondensation, and open up new areas of synthesizing poly（lactic acid）-based functional polymers by direct polycondensation, glycol was selected as examples to study lactic acid direct polycondensation under the conditions of adding diols. ~H NMR was used to characterize product structure and viscosity and mass determinations were used to track reaction process. Experimental results show that the addition of glycol is useful to regulate the polymerization degree of poly（lactic acid） due to changing relative amount of hydroxyl and carboxyl functional groups. The method of calculating theoretical polymerization degree of poly（lactic acid） was obtained through experimental study. This study provides preliminary research basis for improving direct polycondensation method to obtain poly （lactic acid） with particular polymerization degree and increase control accuracy of polymerization degree.
出处
《实验技术与管理》
CAS
北大核心
2013年第6期24-27,共4页
Experimental Technology and Management
基金
国家自然科学基金(21164002)
江西省自然科学基金(2009GQH0065)
关键词
乳酸
聚乳酸
缩聚
可降解
lactic acid
poly（lactic acid）
polycondensation
biodegradable
