物理化学学报 >> 2012, Vol. 28 >> Issue (02): 494-498.doi: 10.3866/PKU.WHXB201111233

材料物理化学 上一篇    

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

李培芳1, 闫寿科2, 任忠杰2   

  1. 1. 内蒙古民族大学物理与电子信息学院, 内蒙古通辽 028043;
    2. 北京化工大学材料科学与工程学院, 化工资源有效利用国家重点实验室, 北京 100029
  • 收稿日期:2011-10-11 修回日期:2011-11-09 发布日期:2012-01-11
  • 通讯作者: 任忠杰 E-mail:renzj@mail.buct.edu.cn
  • 基金资助:

    国家自然科学基金(21104002,11164020)资助项目

An Optical Microscopy Study on the Solvent-Induced Crystalline Morphology of Ladder Polyphenylsilsesquioxane

LI Pei-Fang1, YAN Shou-Ke2, REN Zhong-Jie2   

  1. 1. College of Physics and Electronic Information, Inner Mongolia University for the Nationalities, Tongliao 028043, Inner Mongolia, P. R. China;
    2. State Key Laboratory of Chemical Resource Engineering, School of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
  • Received:2011-10-11 Revised:2011-11-09 Published:2012-01-11
  • Contact: REN Zhong-Jie E-mail:renzj@mail.buct.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21104002,11164020).

摘要: 通过溶剂诱导结晶的方法研究了梯形苯基聚倍半硅氧烷(PPSQ)的球晶结构. 采用光学显微镜研究了溶液的浓度、溶剂的挥发时间以及温度等影响因素对梯形苯基聚倍半硅氧烷的球晶结构形貌的影响. 实验结果表明: 稀释溶液浓度与提高结晶温度在改变球晶的形态方面具有相同的效果. 球晶的尺寸会随着溶液浓度的降低或者结晶温度的升高而增加. 这都归因于梯形苯基聚倍半硅氧烷在二甲苯中的溶解度的增加. 在不改变其它结晶条件的情况下,延长溶剂的挥发时间也会形成更大的球晶. 当在光学显微镜下旋转样品时球晶的结构不会发生改变,这表明球晶具有均一的晶体学取向结构. 负性球晶的特征也表明梯形苯基聚倍半硅氧烷的分子链是沿着球晶的切线方向排列. 考虑到梯形苯基聚倍半硅氧烷具有刚性的分子链,还提出了梯形苯基聚倍半硅氧烷可能的球晶结构模型.

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

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.

Key words: Polyphenylsilsesquioxane, Crystallization, Solvent induction, Spherulite, Rigid chain

MSC2000: 

  • O641