高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

PLLA-PEG共聚物的非等温结晶行为

任杰, 桂宝珠, 任天斌, 杨军, 顾明浩   

  1. 同济大学先进土木工程材料教育部重点实验室, 上海 200092
  • 收稿日期:2007-03-30 修回日期:1900-01-01 出版日期:2007-10-10 发布日期:2007-10-10
  • 通讯作者: 任杰

Non-isothermal Crystallization Behavior of PLLA-PEG Copolymer

REN Jie*, GUI Bao-Zhu, REN Tian-Bin, YANG Jun, GU Ming-Hao   

  1. Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education, Tongji University, Shanghai 200092, China
  • Received:2007-03-30 Revised:1900-01-01 Online:2007-10-10 Published:2007-10-10
  • Contact: REN Jie

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被引次数

11

摘要： 采用熔融共聚法制备PLLA-PEG嵌段共聚物, 用WAXD和DSC方法研究其结晶行为, 并用Avrami方程的Jeziorny修正分析了非等温结晶动力学行为. 结果表明, PLLA结晶明显, 而PEG结晶难以观察到, PEG的柔性能促进PLLA结晶. PEG分子量的增加和投料量的增加都能使得结晶温度升高, 结晶度增大, 结晶速度加快.

关键词: 聚乳酸, 聚乙二醇, 直接熔融缩聚, 非等温结晶

Abstract: Poly(L-lactic acid)-poly(ethylene glycol) was copolymerized with direct melt copolymerization, and its crystallization was studied via WAXD and DSC. Via using Avrami equation modified by Jeziorny, the crystallization kinetics under a non-isothermal condition was analyzed. The crystallization of PLLA was obvious, while the PEG's could not observed. But the flexibility of PEG promoted PLLA's crystallization. And the crystalline temperature, velocity and crystallinity of PLLA-PEG increased with the increase of molecular weight of PEG and the feed weight ratio.

Key words: Poly(lactic acid), Poly(ethylene glycol), Direct melt condensation polymerization, Non-isothermal crystallization

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