LARGE DIELECTRIC RELAXATIONS IN AN ALTERNATE COPOLYMER OF VINYLIDENE CYANIDE AND VINYL ACETATE.

被引：0

作者：

Furukawa, Takeo ^{[1
]}

Date, Munehiro ^{[1
]}

Nakajima, Kenji ^{[1
]}

Kosaka, Takeshi ^{[1
]}

Seo, Iwao ^{[1
]}

机构：

[1] Inst of Physical & Chemical, Research, Saitama, Jpn, Inst of Physical & Chemical Research, Saitama, Jpn

来源：

Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes | 1986年 / 25卷 / 08期

关键词：

RELAXATION PROCESSES;

D O I：

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学科分类号：

摘要：

An alternate copolymer of vinylidene cyanide and vinyl acetate has been investigated dielectrically at temperatures above T//g approximately equals 170 degree C. A remarkable relaxation was observed in the 1 Hz to 10 kHz frequency range due to a separation from coexisting contributions as a result of the dc conductivity. The relaxation time depends upon the temperature in the WLF according to the characteristics of the micro-Brownian motions of molecular segments. The relaxation strength was found to reach 125, resulting in an unusually high dielectric constant. Such a large relaxation strength is an indication of some cooperative effects in relation to dipolar motions. Cooling to below T//g in the presence of a high electric field creates a large remanent polarization which is consistent with the strong piezoelectric activity reported for this copolymer.

引用

页码：1178 / 1182

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