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Home  >  Journal list  >  Polymer Journal  >  Vol.32  No.12 (2000)  >  pp.1044-1048

Polymer Journal
<<Previous article Vol.32  No.12 (2000)   pp.1044 - 1048 Next article>>

An X-Ray Diffraction Study on Crystalline and Mesomorphic Structures of Poly(diethylsiloxane)

Katsuhiro INOMATA1), Kazami YAMAMOTO1) and Takuhei NOSE1)
1) Department fo Polymer Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan

ABSTRACT:  Crystal structure and molecular packing analysis for crystalline and mesomorphic poly(diethylsiloxane) (PDES) have been studied by wide-angle X-Ray diffraction measurements using uniaxially-oriented PDES sample without crosslinking process. Well-oriented fiber diffraction pattern measured at 0°C, which corresponds to the β2 polymorph, can be satisfactorily indexed by monoclinic unit cell with c (fiber axis)=5.02Å. Only four independent reflections can be observed for mesomorphic PDES at 26°C, but the orientational direction of the PDES specimen has been maintained after the crystalline-mesophase transition. Molecular-packing manner of crystalline β2-PDES has been estimated with assuming planar-Si-O-backbone with alternating cis-trans conformation.


Keyword:
Poly(diethylsiloxane)/ Crystal Structure/ Mesophase/ X-Ray Diffraction/ Polymorphism

Published online: June 29, 2001
© Copyright, 2000 by The Society of Polymer Science, Japan

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