Morphology and physical properties of a liquid-crystalline main-chain polymer with flexible side chains
article
A molecular laminate model is used to explain the properties of unoriented and oriented films of poly(p-phenylene-2,5-didodecyloxyterephthalate) cast from solution. In oriented films the two different crystal modifications, A and B, give rise to room temperature tensile moduli of 15 and 30 GPa respectively. The packing (in clusters) of the side chains in modification A, leading to a glass-like transition in the side-chain regions around -40 °C, is largely responsible for this difference. Oriented films of modification A and B have coefficients of thermal expansion of +0.3×10-5 and -1×10-5 K-1 respectively. It is concluded that the properties of this class of polymers can be adjusted in a systematic way.
Topics
TNO Identifier
232668
ISSN
10427147
Source
Polymers for Advanced Technologies, 5(9), pp. 615-617.
Publisher
Wiley
Collation
3 p.
Place of publication
Chichester, UK
Pages
615-617
Files
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