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Molecular Mobility and Phase Transitions in a Liquid Crystalline Polymer Studied by Dielectric Techniques

 

作者: Polycarpos Pissis,   George Georgoussis,   Andreas Schoenhals,   EugeniyB. Barmatov,   ValeriyP. Shibaev,  

 

期刊: Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals  （Taylor Available online 2000）
卷期: Volume 352, issue 1  

页码: 93-100

 

ISSN:1058-725X

 

年代: 2000

 

DOI:10.1080/10587250008023165

 

出版商: Taylor & Francis Group

 

关键词: comb-shaped LCP;dielectric relaxation;thermally stimulated depolarization;temperature derivative method

 

数据来源: Taylor

 

摘要:

The mechanisms of molecular mobility and of phase transitions in a thermotropic, comb-shaped, side-chain liquid crystalline polymer (LCP), poly-(ε-acryloyloxycaproyloxyphenyl)-n-butoxybenzoate (PABB) were studied by dielectric techniques (dielectric relaxation spectroscopy, DRS, and thermally stimulated depolarization currents, TSDC). Two subglass secondary relaxations, β and γ, were observed in TSDC measurements, at about -100 and -150°C, respectively. The β relaxation, as well as, the α relaxation, associated to the glass transition, were studied by DRS.

 

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