Crystalline Forms in Nascent Polyethylene

Abstract

Abstract: The crystalline structure of nascent polyethylene prepared by heterogeneous Ti-Mg catalyst has been studied.The reflection for the 001 planes in the monoclinic lattice from WAXD is more intense when the sample was synthesized at lower temperature, but remains constant for the samples at different polymerization yields. By treating the polyethylene powder by supersonic wave, a portion of the powder fell apart into smaller particles. Among the particles, a single crystal in monoclinic form was found by using TEM and electron diffraction.The generation of the monoclinic crystal is considered to be the presence of com pressive force in the polymerization process,which may arise from the crowding of the grow ing polymer globules.

Key words: Polyethylene, Crystalline, Monoclinic, Morphology

CLC Number:

O632.12

TrendMD:

WU Qing, ZHANG Qi-Xing, LU Ze-Jian, WANG Hai-Hua, OUYANG Wei, LIN Shang-An, ZHANG Guang-Hua. Crystalline Forms in Nascent Polyethylene[J]. Chem. J. Chinese Universities, 1995, 16(5): 823.

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Crystalline Forms in Nascent Polyethylene

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