Morphology of Polypropylene and Tree Initiation

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概要

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• The morphological aspect of a polypropylene (PP) sample is investigated using an X-ray diffrectometer, differential scanning calorimetry (DSC) and an infrared (IR) spectrophotometer. It is found that the samples with spherulite used in this study are composed mainly of the γ-form and a small amount of the α-form, and that the sample without spherulite is composed of a pseudohexagonal phase. The effect of morphology, oxygen and ultraviolet ray (UV) irradiation on tree initiation, and the influence of morphology on space charge are also studied. It is found that space charge storage becomes more difficult and that tree initiation voltage becomes higher with an increase of crystallinity and crystallite size of PP. In the presence of oxygen, tree initiation is attributed to both the accumulation of space charges and the reaction of free radicals with oxygen, while tree initiation is only attributed to the accumulation of space charge in the absence of oxygen.

• 社団法人応用物理学会の論文
• 1998-07-15

著者

• YAN Ping

  Electrotechnical Laboratory

• Yan Ping

  Structure Research Laboratory And Department Of Chemistry University Of Science And Technology Of Ch

• NAKAGAWA Zenbe-e

  Materials and Structures Laboratory, Tokyo Institute of Technology

• Yoshimura Noboru

  Faculty Of Engineering And Resource Science Of Akita University

• Nakagawa Zenbe-e

  Faculty Of Engineering And Resource Science Akita University

• Nakagawa Zenbe-e

  Faculty Of Engineering And Resource Science Of Akita University

• XU Jianfei

  Faculty of Engineering and Resource Science, of Akita University

• YAN Ping

  Faculty of Engineering and Resource Science, of Akita University

• Xu Jianfei

  Faculty Of Engineering And Resource Science Of Akita University

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