ILs-MPEG对PLA玻璃化转变温度和热稳定性的影响  

Effects of the ILs-MPEG on Glass Transition Temperature and Thermal Stability of PLA

作　　者：余芸[1] 桂豪冠[1] 何飞[1] 陈守雨[1] 靳丹萍[1] 丁运生[1] 

机构地区：[1]合肥工业大学化学工程学院高分子材料与化工研究所,合肥230009

出　　处：《工程塑料应用》2012年第6期6-9,共4页Engineering Plastics Application

基　　金：国家自然科学基金项目(50973025);安徽高校省级自然科学研究重点项目(KJ2009A019);安徽省自主创新专项资助项目(11Z0101061)

摘　　要：利用链长不同的含聚乙二醇单甲醚侧链的咪唑基离子液体(ILs-MPEG)改性聚乳酸(PLA),通过熔融共混法制备PLA/ILs-MPEG共混物试样。采用扫描电子显微镜观察了ILs-MPEG在PLA基体中的分散情况,应用差示扫描量热仪和热重分析仪,分别研究了ILs-MPEG对PLA的增塑作用与热稳定性的影响。结果表明,ILs-MPEG可较为均匀地分散在PLA基体中,但随着其侧链长度增加,分散性下降。ILs-MPEG能促使PLA的玻璃化转变温度(Tg)明显降低,表现出显著的增塑作用,同时PLA热稳定性随ILs-MPEG侧链长度增加均呈先增加后减小的趋势。其中,ILs-MPEG800能有效降低PLA的Tg,但对PLA的热稳定性影响最小。The ILs-MPEG, a series of imidazolium ionic liquid, containing MPEG side chain with different length were incorporated into PLA to prepare the PLA/ILs-MPEG blend samples by melt-blending. The dispersion of ILs-MEPG in PLA matrix was observed by SEM, and then the plasticization effect and thermal stability of ILs-MPEG on PLA were investigated by differential scanning caborimetry （DSC） and thermo gravimetric analysis （TGA） respectively. The results showed that ILs-MPEG could be dispersed in PLA matrix even, but the dispersion decreased with the length of MPEG side chain increasing. The glass transition temperature （T~） of PLA was effectively decreased with addition of ILs-MPEG due to the plasticization effect of ILs-MPEG, however, the thermal stabilities of PLA increased first and then decreased with the length of MPEG side chain increasing. In all of ILs-MPEG, the ILs-MPEG800 decreased Tg of PLA apparently, and had the least influence on PLA thermal stability.

关 键 词：聚乳酸 离子液体 增塑作用 热稳定性 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]