摘要
比较了超微乳液聚合得到的稀链聚苯乙烯微球（ｍｉｃｒｏ－ＰＳ）和常规聚苯乙烯（ｏ－ＰＳ）在ＤＳＣ扫描过程中的不同热行为。ｍｉｃｒｏ－ＰＳ在第一次扫描过程中在１０７℃与１５７℃处出现放热峰，在第二次扫描过程中放热峰消失，和ｏ－ＰＳ相类似，仅出现１个玻璃化转变峰。用偏光显微镜和Ｘ射线衍射的方法证明该峰是结晶峰，形成晶体的动力来自于ｍｉｃｒｏ－ＰＳ的特殊构象。
Pauci-chain microspheres prepared by microemulsion polymerization contain only one or at most a few macromolecular chains whose special conformation is much different with that of ordinary polymer, which leads to some interesting physical properties. This paper reports apparent differences in thermal behavior between micro-PS (pauci-chainpolystyrene) and o-PS (ordinary polystyrene) during the DSC scan. Micro-PS displayed two exothermic peaks near 107℃ and 157℃ during the first scan. In the subsequent scan, both of them disappeared and only one glass transition similar to o-PS was shown.With the results from experiments of polarizing microscopy and X-ray diffraction, it can be concluded that both of the exothermic peaks were crystalline peaks.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1995年第12期1960-1963,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
乳液聚合
聚苯乙烯
微球
Microemulsion polymerization,Pauci-chain polystyrene microsphere, Crystalline peak
