Citation: ZHANG Xingyuan, FURUKAWA, Takeo. STUDIES ON THE CHAIN STRUCTURAL EFFECT OF PVDF AND VDF (52)/TrFE(48) COPOLYMER BY MEANS OF THE METHOD OF DIELECTRIC RELAXATION*[J]. Chinese Journal of Polymer Science, ;1994, 12(1): 12-21. shu

STUDIES ON THE CHAIN STRUCTURAL EFFECT OF PVDF AND VDF (52)/TrFE(48) COPOLYMER BY MEANS OF THE METHOD OF DIELECTRIC RELAXATION*

Received Date: 20 April 1992

Through improvements on a fully commercial and automatic system measuring frequency andtemperature spectra of the complex elastic, dielectric, and piezoelectric constants of polymerfilms, the precision for measuring complex dielectric constants achieved 2‰ from original 1%.The complex dielectric constants of PVDF, VDF (95 )/VF (5), VDF (52)/TrFE (48) and VDF(47. 5)/TrFE(47. 5)/HeFP (5) over a range of-120-140℃, 10-2-104Hz were measured bythe described system. The diminution of chain regularity due to 5mol% vinyl fluoride in the chain of PVDF led to disappearing of α-relaxation and increase in Tg(3℃)of VDF (95)/VF(5).Because of the spatial impediment of 5mol% HeFP in copolymer chain,the Curie point of VDF (52)/TrFE(48)decreased by 30℃.The behavior of dielectric relaxation indicated that 5mol% vinyl fluoride and HeFP made the relaxation strength of noncrystalline region reduced,the activation energy of local relaxation increased and the relaxation time prolonged respectively.
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