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.
STUDIES ON THE CHAIN STRUCTURAL EFFECT OF PVDF AND VDF (52)/TrFE(48) COPOLYMER BY MEANS OF THE METHOD OF DIELECTRIC RELAXATION*
摘要:
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.
English
STUDIES ON THE CHAIN STRUCTURAL EFFECT OF PVDF AND VDF (52)/TrFE(48) COPOLYMER BY MEANS OF THE METHOD OF DIELECTRIC RELAXATION*
Abstract:
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.
扫一扫看文章
计量
- PDF下载量: 0
- 文章访问数: 0
- HTML全文浏览量: 0
下载:
