表面修饰聚乙二醇粒子的非等温结晶过程  

Non-isothermal Crystallization of Surface Modified Polyethylene Glycol (PEG) Particles

作　　者：宋正红[1] 张志英[1] 董知之[1] 吴世臻[1] 王曙光[1] 宋娜[1] 

机构地区：[1]天津工业大学改性与功能纤维重点实验室,天津300160

出　　处：《材料科学与工程学报》2007年第2期258-261,290,共5页Journal of Materials Science and Engineering

基　　金：天津市高等学校科技发展基金资助项目(20050511);天津市科技发展计划基金资助项目(06TXJJC14400)

摘　　要：采用乙基纤维素对聚乙二醇(PEG)粒子进行表面修饰,通过对修饰后PEG粒子和未修饰PEG粒子进行差示扫描量热(DSC)测试,研究PEG材料尺寸对非等温结晶过程的影响。结果发现:表面修饰PEG粒子在球晶生长碰到皮材时结晶结束,而未修饰PEG粒子在球晶生长一段时间后相互碰撞挤压直到填满所有空隙后结晶才结束;表面修饰后结晶半时间和结晶最快时间变短;表面修饰PEG粒子和未修饰PEG粒子在尺寸小于400μm时,表面修饰PEG粒子的结晶峰峰位向高温移动。The surface of Polyethylene glycol （PEG） particles were modified by using ethyl cellulose. Influence of the PEG particles＇ size on non-isothermal crystallization was investigated by using a differential scanning calorimeter （DSC）. It was inferred that the crystallization ends when the fronts of the spherulites in the surface modified PEG particle arrive the wall. But the fronts of the spherulites in original PEG particle are likely to reach inside of adjacent PEG particles. The half time of the crystallization and the fastest time of the crystallization of the surface modified PEG particles are shorter than those of the original PEG particles. The crystallization peak position of the surface modified PEG particles shifts to higher temperature when that the PEG particles＇ diameter is less than 400μm.

关 键 词：非等温结晶 表面修饰 聚乙二醇 DSC 

分 类 号：TQ320.1[化学工程—合成树脂塑料工业]