The influence of thermal annealing on microstructure and mechanical properties in high performance liquid crystal copolyesters

Document Type

Conference Proceeding

Publication Date

5-22-2012

Abstract

In this research we have focused on the influence of thermal treatment for periods of time on the thermal and mechanical properties of extruded films of a series of high-performance thermotropic liquid crystal polymers (LCPs). The dependence of microstructure, thermal and mechanical properties on the extent of thermal treatment is investigated. Especially synthesized wholly aromatic LCPs based on hydroxybenzoic acid (B), hydroxynaphthoic acid (N), terephthalic acid (TA) and biphenol (BP) are kindly supplied by Hoechst Celanese Research Corp in the form of 50 μm thick extruded films. Thus, the influence of monomer composition is also studied in order to contrast the influence of molecular conformation. Thermal treatments are carried out at temperatures close to the solid-to-nematic transition (T s→n) for up to several hours under dry air conditions. The results show a profound influence of thermal annealing on morphology and mechanical modulus when annealing is carried out c.a. 40°C below T s→n, where solid-to-nematic transition and Young's modulus are significantly increased. © 2012 Materials Research Society.

Identifier

84861127766 (Scopus)

ISBN

[9781605113500]

Publication Title

Materials Research Society Symposium Proceedings

External Full Text Location

https://doi.org/10.1557/opl.2012.317

ISSN

02729172

First Page

185

Last Page

189

Volume

1373

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