应用化学 ›› 1990, Vol. 0 ›› Issue (2): 49-53.

• 研究论文 • 上一篇    下一篇

α-iPP的附生结晶研究

申宇, 杨德才, 冯之榴   

  1. 中国科学院长春应用化学研究所高分子物理开放实验室 长春 130022
  • 收稿日期:1989-04-13 修回日期:1989-07-24 出版日期:1990-04-10 发布日期:1990-04-10
  • 基金资助:
    中国科学院重大研究项目基金;国家自然科学基金

INVESTIGATION OF EPITAXIAL CRYSTALLIZATION OF α-iPP

Shen Yu, Yang Decai, Feng Zhiliu   

  1. Laboratory of Polymer Physics, Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022
  • Received:1989-04-13 Revised:1989-07-24 Published:1990-04-10 Online:1990-04-10

摘要: 用离焦电子显微术及电子衍射技术研究了不同温度下等规立构聚丙烯(α-iPP)超薄膜的细微结构。溶液浇铸的薄膜中的球晶内含有十字交叉和单晶型两种结构,与结晶温度无关。十字交叉结构中复杂的广角片晶支化是由子片晶在母片晶的(010)侧面上附生生长造成的,母子片晶均为侧立放置的链折叠片晶,它们的结晶学c轴位于膜平面内,并成一固定的夹角(100°左右)较低温度结晶时,有大量的多重广角片晶支化;结晶温度越高,支化程度越低。

关键词: 聚丙烯, 形态结构, 附生结晶

Abstract: The microstructure of a-iPP films prepared by solution-casting on glycerol and crystal-lized at different temperature was investigated by means of defocused electron microscopy andelectron diffraction techniques. Microscopic observation showed that all the samples consis-ted of two kinds of structures: cross-hatched and single-crystal-type structure, independentof crystallization temperature. In the cross-hatched structure, as a result of epitaxial cry-stallization, there existed wide-angle and low-angle branchings of lamellae seen edge-on.The characteristics of the former branching were accounted for by the way of epitaxial growth of daughter lamellae on the lateral face(010)of parent lamellae substrate, while thelater was explained in this paper by the theory of branching of individual dominant lamel-lae proposed by Bassett and Olley.

Key words: polypropylene, morphological structate, epitaxial crystallization