Effects of Nucleating Agents on the Crystallization and Morphology of Syndiotactic Polystyrene

• Main Author: 陳建明
• Other Authors: 郭人鳳
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/58951461995132780707

碩士 === 國立成功大學 === 化學工程學系 === 88 === Nucleating agents are chosen with inorganic compounds (talc, antimony oxide, and mica), and organic compounds (na11, na21, and Al-PTBBA). The influence of various nucleating agents on the crystallization parameters of syndiotactic polystyrene is reported. Non-isothermal and isothermal crystallization is investigated by differential sacnning calorimetry (DSC). It has been stated that the addition of a nucleating agent affects the crystallization rate, dimension and homogeneity of spherulitic sizes. The crystallization temperature Tc, induction time ti, the crystallization half-time t1/2, the crystallization rate constant K, and the Avrami coefficient n were measured and related to the different characteristics of the specimens. The morphology induced by the different nucleating agents by hot stage polarizing microscopy, scanning electron microscopy and wide-angle X-ray diffraction analysis. Syndiotactic polystyrene containing talc series is converted into pure or nearly pureβ(β'') modification in the isothermal and non-isothermal crystallization experiments.