化工进展 ›› 2016, Vol. 35 ›› Issue (02): 539-543.DOI: 10.16085/j.issn.1000-6613.2016.02.030

• 材料科学与技术 • 上一篇    下一篇

端羧基聚乳酸的扩链、改性及其性能

刘钰维, 樊国栋, 管园园, 王丽娜   

  1. 陕西科技大学化学与化工学院, 陕西 西安 710021
  • 收稿日期:2015-07-13 修回日期:2015-09-28 出版日期:2016-02-05 发布日期:2016-02-05
  • 通讯作者: 樊国栋,教授,硕士生导师,研究方向为聚乳酸基复合材料的研究。
  • 作者简介:刘钰维(1991-),女,硕士研究生。E-mail:1121562695@qq.com。
  • 基金资助:
    陕西省科技厅科技攻关计划(2014K08-12)、陕西省教育厅重点实验室科研项目(14JS015)及陕西科技大学研究生创新基金项目。

Chain expansion,modification and properties of the carboxyl terminated poly-lactide

LIU Yuwei, FAN Guodong, GUAN Yuanyuan, WANG Lina   

  1. College of Chemistry & Chemical Engineering, Shaanxi University of Science & Technology, Xi'an 710021, Shaanxi, China
  • Received:2015-07-13 Revised:2015-09-28 Online:2016-02-05 Published:2016-02-05

摘要: 以丙交酯为原料、辛酸亚锡为催化剂、丁二酸酐为改性剂,采用梯度升温法,在150℃、0.098MPa条件下采用直接熔融缩聚法合成端羧基聚乳酸共聚物P(LA/SA),接着用2,2-(1,3-亚苯基)-二 唑啉(1,3-PBO)对其进行扩链,按n(丙交酯)/n(1,3-PBO)= 1/2.4加入1,3-PBO,反应1h制得聚酰胺酯(PEA),最后将高岭土与PEA在150℃、减压条件下熔融复合改性。采用GPC、FTIR、1H NMR、DSC、SEM等手段对聚合物的结构进行表征和性能测试,结果表明,与P(LA/SA) 相比,扩链产物PEA相对分子质量大幅度提高,重均相对分子质量高达24万,玻璃化转变温度Tg高于PLA和P(LA/SA),改性后复合材料的热稳定性能提高,结晶度降低。

关键词: 聚乳酸, 二 唑啉, 扩链法, 高岭土, 复合材料

Abstract: The terminal carboxyl group of polylactic acid copolymer P (LA/SA) was synthesized with lactide as raw material,stannous caprylate as the catalyst and succinic anhydride as modifier by direct melt polycondensation,and under the condition of 150℃ and 0.098MPa (LA/SA). The polyesteramide (PEA) was synthesized using 2,2-(1,3-phenylene)-bis(2-oxazoline) (1,3-PBO) chain the terminal carboxyl group of polylactic acid copolymer with the n(lactide)/n(1,3-PBO) is 1/2.4 and the reaction time of 12h. Finally,Kaolin and PEA melting compound was modified under stress conditions at 150℃. The structure were characterized by FTIR and the properties were investigated by GPC,FTIR, 1H NMR,DSC,SEM. The result showed that the relative molecular weight of the chain extender product PEA increased significantly compared with P (LA/SA),and the heavy molecular weight was up to 240000. Its glass transition temperature is also higher than that of PLA and P (LA/SA). The thermal stability of the composite material is improved and the crystallinity is reduced after being modified.

Key words: poly(D,L-lactide), 2,2'-bis( 2-oxazoline), chain extending, Kaolin, composites

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