全文下载：2012050463
吴晓， 谷明刚， 张建明*
（青岛科技大学 橡塑材料与工程教育部重点实验室，山东 青岛 266042）
摘要： 利用时间分辨的傅里叶变换红外光谱（FT-IR），结合自制实验附件，对室温溶剂诱导左旋聚乳酸（PLLA）薄膜结晶过程中的结构变化进行原位光谱研究，从分子水平上揭示PLLA从无序到有序的结构演变。结果表明：多种溶剂诱导PLLA结晶均形成α′晶型。温度升高时，结晶速率加快，结晶活化能为Ea≈146.1×103 J·（mol·K）-1。除甲苯外，多数溶剂诱导均能诱导PLLA结晶，但其诱导结晶能力不同，其中丙酮可以最有效地加速PLLA结晶。计算所得PLLA的红外结晶度大小顺序为氯仿＞丙酮＞四氢呋喃＞乙酸乙酯＞乙醇＞甲苯。结晶度较大者对应溶剂的溶度参数与PLLA的溶度参数相近。
关键词： 傅里叶变换红外光谱； 左旋聚乳酸； 原位跟踪； 溶剂诱导结晶
中图分类号： TQ 32文献标志码： A
In-situ Spectra Studies on Structure Evolution of PLLA Induced by Solvent Vapor
WU Xiao， GU Ming-gang， ZHANG Jian-ming
(Key Laboratory of Rubber-plastics, Ministry of Education,
QingdaoUniversityof Science and Technology,Qingdao266042,China)
Abstract: Time-resolved measurement of FT-IR has been performed to trace in-situ the structure evolution of PLLA induced by solvent vapor with the self-made experimental accessory at room temperature, revealing the structural changes of PLLA from amorphous to semi-crystallization on the molecular level. The results showed that PLLA formed α′ morphology induced by various solvents′ vapor. With the temperature increases, crystallization rate was accelerated, and the activation energy Ea for PLLA crystallization was 146.1×103J（mol·K）-1. And most of the solvents induced the crystallization of PLLA film except toluene, while acetone is the most effective solvent to accelerate the crystallization among the solvents used. However, the order of crystallinity is chloroform＞acetone＞THF＞ethyl acetate＞alcohol＞toluene. The closer solubility parameter between solvent and PLLA, the higher crystallinity.
Key words: FT-IR; PLLA; in-situ trace; solvent-induced crystallization
收稿日期：2011-12-12
作者简介： 吴晓（1981—），女，硕士研究生.*通信联系人.
