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;
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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.
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页码：1178 / 1182
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