Citation: LI Pei-Fang, YAN Shou-Ke, REN Zhong-Jie. An Optical Microscopy Study on the Solvent-Induced Crystalline Morphology of Ladder Polyphenylsilsesquioxane[J]. Acta Physico-Chimica Sinica, ;2012, 28(02): 494-498. doi: 10.3866/PKU.WHXB201111233 shu

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

1.
1. College of Physics and Electronic Information, Inner Mon lia University for the Nationalities, Tongliao 028043, Inner Mon lia, 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 Date: 11 October 2011
Available Online: 23 November 2011
Fund Project: 国家自然科学基金(21104002,11164020)资助项目 (21104002,11164020)

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.
- Polyphenylsilsesquioxane,
- Crystallization,
- Solvent induction,
- Spherulite,
- Rigid chain
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