中国塑料 ›› 2022, Vol. 36 ›› Issue (11): 7-13.DOI: 10.19491/j.issn.1001-9278.2022.11.002

• 材料与性能 • 上一篇    下一篇

mPEG⁃PLA嵌段共聚物及其胶束的降解行为研究

吴菁菁1, 张文明2(), 周秦鹏1, 张新晴1, 陆冲1()   

  1. 1.华东理工大学材料科学与工程学院生态材料研究室,上海 200237
    2.上海谊众药业股份有限公司,上海,201401
  • 收稿日期:2022-07-31 出版日期:2022-11-26 发布日期:2022-11-25
  • 通讯作者: 张文明(1984—),男,工程师,从事可降解高分子载体材料研究,zhwm5342@163.com
    陆冲(1966—),男,副教授,从事可降解高分子材料的合成与加工研究,luchong@ecust.edu.cn
    E-mail:zhwm5342@163.com;luchong@ecust.edu.cn

Degradation behavior of mPEG⁃PLA block copolymer and its micelles

WU Jingjing1, ZHANG Wenming2(), ZHOU Qinpeng1, ZHANG Xinqing1, LU Chong1()   

  1. 1.Ecological Materials Research Laboratory,School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China
    2.Shanghai Yizhong Pharmaceutical Co,Ltd,Shanghai 201401,China
  • Received:2022-07-31 Online:2022-11-26 Published:2022-11-25
  • Contact: ZHANG Wenming, LU Chong E-mail:zhwm5342@163.com;luchong@ecust.edu.cn

摘要:

采用开环聚合法制备了聚乙二醇单甲醚(mPEG)与D,L⁃丙交酯的嵌段共聚物,并以此共聚物为载体制备了紫杉醇胶束,研究了mPEG⁃聚丙交酯(PLA)与载药胶束(DMs)在不同条件下的降解特点。结果表明,在低温下(4 ℃),mPEG⁃PLA聚合物和DMs均能长时间(24个月)保持稳定,未发生明显降解;当温度升高,mPEG⁃PLA和DMs降解速度明显增加,但降解机理有所不同,这种差异在40 ℃以上的环境中更明显;mPEG⁃PLA聚合物的高温(60 ℃)降解以链段内部无规则断裂为主,分子量显著降低;DMs在高温(60 ℃)下则更多遵循“末端降解机理”,生成更多的丙交酯和乳酸。

关键词: 聚丙交酯, 共聚物, 载药胶束, 降解

Abstract:

Poly(ethylene glycol monomethyl ether⁃co⁃poly lactide) (mPEG⁃PLA) was prepared through ring opening polymerization of methoxy poly(ethylene glycol) and D, L⁃lactide, and then the mPEG⁃PLA/paclitaxel drug⁃loaded micelles (DMs) was prepared. The degradation characteristics of mPEG⁃PLA and drug⁃loaded micelles were studied under different conditions. The results indicated that mPEG⁃PLA and DMs kept stable at a low temperature of 4 ºC even for a long period of 24 months. The degradation rates of mPEG⁃PLA and DMs improved with an increase in temperature, but their degradation mechanisms were different, especially at temperature above 40 ºC. The degradation of mPEG⁃PLA was dominated by the random fracture inside the segment, resulting in a significant decrease in molecular weight. However, there was no obvious increase in the contents of lactide and lactic acid. The degradation mechanism of DMs was more possibly attributed to the “chain⁃end scission rule” at a high temperature of 60 ºC. This means the depolymerization at the terminal, leading to the production of more amounts of lactide and lactic acid.

Key words: poly lactide, copolymer, drug?loaded micelle, degradation

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