中国塑料 ›› 2008, Vol. 22 ›› Issue (10): 28-32 .DOI: 10.19491/j.issn.1001-9278.2008.10.006

• 材料与性能 • 上一篇    下一篇

PLA/OMMT纳米插层复合材料的合成、表征及降解性研究

甄卫军,马小惠, 袁龙飞, 庞桂林, 刘月娥   

  1. 新疆大学化学化工学院
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2008-10-25 发布日期:2008-10-25

Synthesis, Characterization and Degradability of PLA/OMMT Intercalation Nanocomposite

ZHEN Wei-jun, MA Xiao-hui, YUAN Long-fei, PANG Gui-lin, LIU Yue-e   

  1. College of Chemistry and Chemical Engineering of Xinjiang University
  • Received:1900-01-01 Revised:1900-01-01 Online:2008-10-25 Published:2008-10-25
  • Contact: ZHEN Wei-jun

摘要:

以乳酸单体和有机蒙脱土(OMMT)为原料,通过原位插层聚合法合成了聚乳酸(PLA)/OMMT纳米插层复合材料, 分别采用傅立叶变换红外光谱( FT-IR)、X 射线衍射(XRD)、透射电子显微镜(TEM)等对PLA/OMMT复合材料的结构、形貌进行了表征和分析,同时研究了材料的降解性能。FT-IR表明,OMMT在聚合过程中被剥离成很小的粒子并分散在PLA基体中形成PLA/OMMT复合材料。由XRD分析可知MMT的层间距为1.260 nm,OMMT层间距为1.993 nm,PLA/OMMT复合材料中OMMT层间距为2.287 nm,层间距明显增大,表明PLA分子链插入到OMMT片层间,实现了原位插层聚合。透射电镜(TEM)分析表明,制备的PLA/OMMT复合材料形成了插层型结构,与红外光谱与XRD表征结果吻合。降解试验表明,介质对材料降解作用的次序为:NaOH>HCl>去离子水。在磷酸盐缓冲溶液中,随着降解时间的延长,材料的特性黏度在降解过程中不断下降。PLA/OMMT复合材料的降解速度要快于PLA,表明由于OMMT纳米粒子的存在,会加速材料的降解。

关键词: 聚乳酸, 有机蒙脱土, 纳米插层复合材料, 合成, 降解性能

Abstract: PLA /OMMT intercalation nanocomposite was synthesised by in-situ intercalation polymerization with organomontmorillonite (OMMT) and lactic acid monomer. The structure and morphology of PLA/OMMT intercalation nanocomposite were characterized by FT -IR , XRD,TEM. The degradability of PLA/OMMT intercalation nanocomposite was also studied. The FT –IR spectra indicated that the OMMT was exfoliated and dispersed into the PLA matrix during the polymerization. XRD shew that the layer spacings of MMT, OMMT and PLA/OMMT intercalation nanocomposite were 1.260nm, 1.993 nm and 2.287 nm individually, which shew the swellable silicate layers were intercalated by the PLA matrix, and in-situ intercalation polymerization was done. TEM images demonstrated that the PLA/OMMT intercalation nanocomposite was of intercalative structure, which accorded with the results of FT –IR and XRD. The results of the degradation of PLA/OMMT intercalation nanocomposite showed the media degradability rank was as following : NaOH>HCl>deionied water. In PBS buffer solution the intrinsic viscosity of PLA/OMMT intercalation nanocomposite was declined as the degrading time .It was shown that the degradability rate of PLA/OMMT intercalation nanocomposite was faster than that of PLA, which demonstrated that the degradability of PLA/OMMT intercalation nanocomposite was improved by the MMT 。

Key words: polylactic acid, organic montmorillonite, intercalation nanocomposite, synthesis, degradability