全同立构聚丙烯的晶片形态

A STUDY ON THE LAMELLAR MORPHOLOGY OF ISOTACTIC POLYPROPYLENE

本文应用光学显微镜,扫描和透射电子显微镜从三种不同层次的结构水平上研究了α和β两种晶型的全同立构聚丙烯的球晶和晶片形态结构,特别是应用四氧化钌染色技术直接观察到两种不同晶型聚丙烯球晶中单独分离的晶片形态.结果表明,不同晶型聚丙烯球晶的形态是不同的,其所呈现的性质与其内部晶片结构的排列特征相对应.同时研究了两种晶型聚丙烯在熔体拉伸结晶条件下生成的晶片形态,倾向于相同的取向晶片结构.电子衍射数据证明了,β型聚丙烯在拉伸取向结晶时将转变为α晶型.

A study is presented concerning the three different structural levels of isotactic polypropylene (iPP). Involved wkhin, is the coordinated application of optical and electron microscopy on both α-form and β-form iPP, crystallized from melt. For TEM in particular, the RuO4 staning technique has been used to reveal the lamellar morphology in both spherulites of iPP. The investigation itself has centred on the different spherulite types, as identified optically, which were correlated with the details of their particular lamellar morphology. The lamellar morphology of both iPP crystallized from melt drawing has also been studied.