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Acta Physica Sinica (Overseas Edition), 1994, Vol. 3(5): 374-383    DOI: 10.1088/1004-423X/3/5/008
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

LOW-TEMPERATURE LOW-FREQUENCY DIELECTRIC RELAXATIONS IN VDF(81)/TeFE(19) COPOLYMERS

ZHANG XING-YUAN(张兴元)a, TAKEO FURUKAWAb
a Department of Chemistry, Science University of Tokyo, 162 Japan; b Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
Abstract  The complex dielectric constants of ferroelectric copolymers VDF(81)/TeFE(19) with dif-ferent crystallinities have been measured over the range of-120- +40℃ and 10-2-10-4 Hz, using an improved dielectric relaxation spectrometer. The low-temperature processes of di-electric relaxation show that the frequency spectra of copolymers below room temperature consist of two parts: a low-frequency component which accords with a WLF equation and is ascribed to the micro-Brownian motions of frozen-in segments in the noncrystalline regions, and a high-frequency component which follows an Arrhenius rule and is designated as the local motions of small-scale segments in the crystalline and/or noncrystalline regions. The calculated results indicate that Tg of copolymers is -52℃ and the activation energy of local relaxation is 37.7 kJ/mol.
Received:  07 April 1993      Accepted manuscript online: 
PACS:  77.22.Gm (Dielectric loss and relaxation)  
  77.22.Ch (Permittivity (dielectric function))  
  77.84.Jd (Polymers; organic compounds)  
  77.80.Bh  
  82.35.Jk (Copolymers, phase transitions, structure)  
  72.30.+q (High-frequency effects; plasma effects)  

Cite this article: 

ZHANG XING-YUAN (张兴元), TAKEO FURUKAWA LOW-TEMPERATURE LOW-FREQUENCY DIELECTRIC RELAXATIONS IN VDF(81)/TeFE(19) COPOLYMERS 1994 Acta Physica Sinica (Overseas Edition) 3 374

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