| 弹性散射法研究间规聚苯乙烯的冷结晶行为 |
| |
| 引用本文： | 郭建维,刘明凯,杨金,周菊英,杨琨,陈旭东.弹性散射法研究间规聚苯乙烯的冷结晶行为[J].化学学报,2012,70(3):49-53. |
| |
| 作者姓名： | 郭建维 刘明凯 杨金 周菊英 杨琨 陈旭东 |
| |
| 作者单位： | 1. 广东工业大学轻工化工学院,广州,510006
2. 中山大学化学与化学工程学院高分子研究所,广州,510275 |
| |
| 基金项目： | 广东省高校重点技术创新项目，广东省科技计划项目 |
| |
| 摘 要： | 用弹性光散射方法研究了间规聚苯乙烯(s-PS)的非等温冷结晶行为和等温结晶动力学.结果表明,弹性散射信号对s-PS的冷结晶过程中的构象变化非常敏感.弹性散射法所得的大分子链玻璃化转变温度Tg以及冷结晶温度Tc与DSC的测量结果一致.此外,通过散射强度随温度的变化可以更为清晰地分辨出冷结晶过程中各个阶段,包括晶体成核期,晶核生长期以及二次结晶期.通过等温弹性散射测试,同时结合Arrhenius方程,计算得到s-PS冷结晶表观活化能Ea为309 kJ/mol.
|
| 关 键 词： | 间规聚苯乙烯 弹性散射 冷结晶 动力学 |
Elastic Light Scattering Studies on Cold-crystallization Behaviors of Syndiotactic Polystyrene |
| |
| Institution: | Guo,Jianweia Liu,Mingkaia Yang,Jinb Zhou,Juyingb Yang,Kunb Chen,Xudong,b(aSchool of Light and Chemical Engineering,Guangdong University of Technology,Guangzhou 510006)(bInstitute of Polymer Science,School of Chemistry and Chemical Engineering,Sun Yat-sen University,Guangzhou 510275) |
| |
| Abstract: | The cold-crystallization behavior of syndiotactic polystyrene(sPS) and its isothermal kinetics were studied by elastic scattering method in this work.It was shown that the scattering signal was very sensitive to the conformational change of sPS chains upon heating.The glass transition temperature(Tg) and cold-crystallization temperature(Tc) obtained by elastic scattering were in good agreement with those measured by DSC method.In addition,it can be clearly observed in the plot of temperature-dependent scattering intensity,there are several stages during the cold-crystallization process,i.e.,nucleation phase,nucleus growth phase and secondary crystallization phase.By using isothermal scattering data and Arrhenius equation,the apparent activation energy of cold-crystallization of sPS was estimated to be 309 kJ/mol. |
| |
| Keywords: | syndiotactic polystyrene elastic scattering cold crystallization kinetics |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
