Open AccessDIELECTRIC RELAXATION OF NONCRYSTALLINE REGIONS IN THE FERROELECTRIC COPOLYMERS OF VINYLIDENE FLUORIDE/TRIFLUOROETHYLENE
Author(s) -
Xingyuan Zhang,
T. Furukawa
Publication year - 1993
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.42.1370
Subject(s) - crystallinity , materials science , dielectric , ferroelectricity , copolymer , relaxation (psychology) , fluoride , annealing (glass) , dielectric loss , ferroelectric polymers , glass transition , polymer , analytical chemistry (journal) , polymer chemistry , composite material , organic chemistry , optoelectronics , inorganic chemistry , chemistry , social psychology , psychology
The films of copolymers of vinylidene fluoride with trifluoroethylene (VDF/TrFE) with different crystallinity were prepared by four methods, i. e. , as-cast, quenching in liquid nitro-gen, slow-cooling and annealing at 140℃. The complex dielectric constants were measured using an improved dielectric relaxation spectrometer whose precision increased to 2‰ from the original 1%. The dielectric relaxation of noncrystalline regions was found in accordance with the dielectric frequency spectra of quenched sample that the crystallinity was 20% below room temperature. Thereby, the relationship between the glass transition temperature and the component of copolymers was got.