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タイトル: Crystallization of polypropylene near the surface in injection-molded plaques: A comparison of morphology and a numerical analysis
著者: Kobayashi, Yutaka
Otsuki, Yasuhiko
Kanno, Hiroaki
Sasakawa, Tomoyoshi
Hanamoto, Yasuhiro
Kanai, Toshitaka
小林, 豊
発行日: 2011年 7月
出版社(者): Wiley-Blackwell
雑誌名: Polymer Engineering and Science
ISSN: 0032-3888
巻: 51
号: 7
開始ページ: 1236
終了ページ: 1244
抄録: Skin morphology formation on injection-molded isotactic polypropylene (PP) was investigated using micro-beam synchrotron wide-angle X-ray diffraction and numerical simulation. The 1-20 Î?m depth range was characterized with an X-ray beam of 0.273 Î?m Ï? 0.389 Î?m in size. From an evaluation of doping nucleating agents (NA) in PP, the NAs did not work at a depth of 1 Î?m. α-specified NA affected crystallization within a 5-Î?m depth. β-specified PP showed α-form crystallinity at the 5-20 Î?m depth. The mesomorphic crystal near the surface showed extremely high orientation. From viscoelastic flow simulation, PP molecules near the surface were oriented in the flow direction by extensional flow in the flow front, but freezing occurred faster than flow-induced crystallization. It was estimated that the delay of crystallization occurred during the transient temperature. The deformation rate did not cause a difference in crystal morphology near the surface, but the cooling rate did. Copyright © 2009 Society of Plastics Engineers.
DOI: 10.1002/pen.21864
URI: http://hdl.handle.net/2297/28503
資料種別: Journal Article
版表示: author
出現コレクション:1.査読済論文(工)

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