Citation: NI Shaoru, YU Fusheng, SHEN Lianfang, QIAN Baogong. DIELECTRIC PROPERTIES OF 1, 2-POLYBUTADIENES[J]. Chinese Journal of Polymer Science, ;1987, 5(2): 120-124. shu

DIELECTRIC PROPERTIES OF 1, 2-POLYBUTADIENES

Received Date: 1 November 1985

The dielectric permittivity and loss tangent of 1,2-polybutadienes with different chain structures were determined as a function of temperature from-180℃ to 100℃ at different frequencies, and the frequency and structure dependence of the dielectric propertie of 1,2-polybutadienes have been investigated. It is found that a maximum of the permittivity occurs in the glass-transition region. The width of the glasstransition peak increases with increasing frequency while its height has little change. With a rise in the content of 1,2-units,the permittivity decreases and the height of the glass-transition peak slightly grows.A maximum of the width of the glass-transition peak appears when the content of 1,2-units is about 45%.Both the permittivity and dielectric loss drop down as the growth of the content of syndiotactic 1,2-units.
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