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Disorder effects in the crystal structure of form II of poly(vinylidene fluoride)

✍ Scribed by L. Kutschabsky; E. Höhne; R.-G. Kretschmer

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
303 KB
Volume
42
Category
Article
ISSN
0323-7648

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✦ Synopsis

Abstract

A new model based on disorder phenomenon concerning the symmetry is proposed for the crystalline structure of form II of poly(vinylidene fluoride) (PVDF). The disorder has the effect that the crystal possesses no unique space group but it consists alternately of monoclinic regions with space group P2~1~/c and orthorhombic regions with space group Pbc2~1~. The ratio between monoclinic and orthorhombic parts changes depending on the conditions of sample preparation. This model explains all experimental data published in literature. Theoretical calculations confirm the correctness of the new model.

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