物理化学学报2012，Vol.28Issue(2)：494-498,5.DOI:10.3866/PKU.WHXB201111233
利用光学显微镜研究溶剂诱导的梯形苯基聚倍半硅氧烷结晶
An Optical Microscopy Study on the Solvent-Induced Crystalline Morphology of Ladder Polyphenylsilsesquioxane
摘要
Abstract
Spherulites of rigid chain ladder polyphenylsilsesquioxane (PPSQ) were produced through solvent-induced crystallization.The influences of solution concentration,solvent evaporation time,and temperature on the spherulitic morphology of PPSQ were studied by optical microscopy.Diluting the solution was found to have the same effect as elevating the crystallization temperature.The size of the spherulites increases with either decreasing concentration or increasing temperature.This is caused by the enhanced solubility of PPSQ in xylene under such conditions.Extending the solvent evaporation time while leaving the other Conditions unchanged also leads to the formation of larger spherulites.The invariance of spherulitic structure upon sample rotation suggests that the spherulites possess a uniform crystallographic orientation.The negative optical characteristics of spherulites indicates that the PPSQ molecular chains are oriented in the tangential direction of the spherulite.Considering the high rigidity of the molecules,an organization model of PPSQ spherulite is proposed.关键词
梯形苯基聚倍半硅氧烷/结晶/溶剂诱导/球晶/刚性分子链Key words
Polyphenylsilsesquioxane/Crystallization/Solvent induction/Spherulite/Rigid chain分类
化学化工引用本文复制引用
李培芳,闫寿科,任忠杰..利用光学显微镜研究溶剂诱导的梯形苯基聚倍半硅氧烷结晶[J].物理化学学报,2012,28(2):494-498,5.基金项目
国家自然科学基金(21104002,11164020)资助项目The project was supported by the National Natural Science Foundation of China (21104002.11164020) （21104002,11164020）
