【作者】 佟翠艳；

【导师】 谢德民； 杨德才；

【作者基本信息】 东北师范大学 ， 物理化学， 2004， 硕士

【摘要】 间同立构1,2-聚丁二烯是一种半结晶性的聚合物，在不同的聚合条件下，1,2单元含量和间规度都会有所不同，从而导致它结构和性能的不同。一般说来，结晶度高，呈塑料性质，结晶度低，呈橡胶性质。因此，研究其结构和性能具有理论意义和应用背景。但近十几年来，绝大多数间同立构1,2-聚丁二烯的研究工作集中在聚合物的制备、物理性质和应用方面，对于其结晶行为和晶体结构则鲜见报道。原因是间同立构1,2-聚丁二烯分子侧链含有大量的双键，在较高的温度下（＞150℃）很容易交联，特别是高间规度的聚合物，由于其熔融温度高（＞200℃）则更容易产生交联，这给结晶行为和结构研究带来了很大困难。本文利用DSC方法和热台偏光显微镜对实验上已合成的间同立构1,2-聚丁二烯的聚集态结构和性能进行了系统研究。主要结论是：间同立构1,2-聚丁二烯自成核处理后的结晶行为和形态结构的研究发现，自成核使间同立构1,2-聚丁二烯的结晶温度明显提高，晶核密度提高了两个数量级，球晶尺寸显著减小。更多还原

【Abstract】 The crystalline syndiotactic 1,2-polybutadiene is a kind of semicrystalline polymer ,at different polymerization conditions, 1,2 unit content and sydiotacticity will be diffent,which will lead to diffent structure and properties. Generally speaking , the polymer with higher crystalline degree has plastic properties ,while the one with lower crystallinity exhibits rubber properties. So, there is theory and application interest in studying its struture and properties. In past few decades, however, most of research work were focused on the preparation, physical properties and application of the polymer, while almost no investigation on its crystallization and morphology has been reported. The main reason is due to the large mount of double bonds contained in the side chains of the polymeric molecules, which will cross-link at higher temperatures (>150℃). Especially for the polymers with high syndiotacticity, the thermal cross-linking reaction will take place very easy during the melt crystallization process because of their high melting temperature (>200℃). This makes the morphologic study of the polymer very difficult. This thesis has studied systemically morphological structure and properties of crystalline syndiotactic 1,2-polybutadiene using DSC and PLM techniques, and obtained the following results: The self- seeding nucleation results in obvious increase of the crystallization temperature of the syndiotactic 1,2-polybutadiene ;the necleus density increases about two <WP=6>orders; and the spherulite size decreases markedly after the self-seeding nucleation treatment.更多还原