Magnetic Orientation of Crystalline Polymers in View of Liquid Crystallinity during Induction Period of Crystallization
作者:
Tsunehisa Kimura,
Hidetoshi Ezure,
Hiroaki Sata,
Fumiko Kimura,
Shintaro Tanaka,
Eiko Ito,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 318,
issue 1
页码: 141-156
ISSN:1058-725X
年代: 1998
DOI:10.1080/10587259808045381
出版商: Taylor & Francis Group
关键词: poly(ethylene-2,6-naphthalate);isotactic polystyrene;magnetic orientation;induction period
数据来源: Taylor
摘要:
Magnetic orientation of poly(ethylene-2,6-naphthalate) (PEN) and isotactic polystyrene (iPS) has been reported. The orientation starts to occur during the induction period of isothermal melt crystallization process, i.e. during the initial stage of crystallization process where no crystal growth is yet observed with respect to the wide angle X-ray diffraction. In the case of PEN, the crystallites obtained at later stages of crystallization were aligned with itsc-axis parallel to the magnetic field, while in the case of iPS, the crystallites obtained were aligned with itsc-axis perpendicular to the magnetic field. X-ray, infrared, and magnetic birefringence measurements indicated that mesophases appearing during the induction period could be responsible for the magnetic orientation of these polymers.
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