LIQUID-CRYSTALLINE MAIN-CHAIN POLYMERS WITH A POLY(P-PHENYLENE TEREPHTHALATE) BACKBONE .9. DYNAMIC-MECHANICAL AND DIELECTRIC BEHAVIOR OF THE POLYESTER WITH 6-(PENTYLOXY)HEXYLOXY SIDE-CHAINS

Authors
DAMMAN SB BUIJS JAHM
Citation
Sb. Damman et Jahm. Buijs, LIQUID-CRYSTALLINE MAIN-CHAIN POLYMERS WITH A POLY(P-PHENYLENE TEREPHTHALATE) BACKBONE .9. DYNAMIC-MECHANICAL AND DIELECTRIC BEHAVIOR OF THE POLYESTER WITH 6-(PENTYLOXY)HEXYLOXY SIDE-CHAINS, Macromolecular chemistry and physics, 195(6), 1994, pp. 2261-2266
Citations number
10
Categorie Soggetti
Polymer Sciences
Journal title
Macromolecular chemistry and physics → ACNP
ISSN journal
10221352
Volume
195
Issue
6
Year of publication
1994
Pages
2261 - 2266
Database
ISI
SICI code
1022-1352(1994)195:6<2261:LMPWAP>2.0.ZU;2-M
Abstract
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 behavio ur in the solid state. In this investigation the influence of replacem ent of the methylene unit at the centre of the side chain by an oxygen atom is studied by means of dynamic mechanical and dielectric measure ments. It turns out that the oxygen replacement results in an obstruct ion of crystallization within the side-chain layers, as is clearly man ifested by the enhancement of the beta-relaxation (attributed to the a morphous side-chain regions) and the nearly complete disappearance of the beta-relaxation (crystalline side-chain regions).