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Liquid‐crystalline main‐chain polymers with a poly( p ‐phenylene terephthalate) backbone, 9. Dynamic mechanical and dielectric behaviour of the polyester with 6‐(pentyloxy)hexyloxy side chains
Author(s) -
Damman Sebastian B.,
Buijs Jan A. H. M.
Publication year - 1994
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1994.021950631
Subject(s) - side chain , materials science , phenylene , dielectric , polyester , polymer , polymer chemistry , amorphous solid , poly(p phenylene) , composite material , chemistry , crystallography , optoelectronics
In the liquid‐crystalline polymer poly( p ‐phenylene terephthalate) with dodecyloxy side chains the various possible crystalline structures of the side chain layers determine the mechanical and dielectric behaviour in the solid state. In this investigation the influence of replacement of the methylene unit at the centre of the side chain by an oxygen atom is studied by means of dynamic mechanical and dielectric measurements. It turns out that the oxygen replacement results in an obstruction of crystallization within the side‐chain layers, as is clearly manifested by the enhancement of the β‐relaxation (attributed to the amorphous side‐chain regions) and the nearly complete disappearance of the β * ‐relaxation (crystalline side‐chain regions).