천연고무의 유전특성에 미치는 가황의 영향

Influence of the Vulcanization on the Dielectric Properties of Natural Rubber

The dielectric propertries of polymers are very important to investigate the molecular structure of polymer. The characteristrics of the dielectric absorption in vulcanized natural rubber were studied in the range of frequency from 10[KHz] to 32[MHz] at the temperature of 25[$^{\circ}C$]. As the results. it has been confirmed that in the case of natural ruber vulcanized between 2 and 4phr the specimens exhibit two kind of dielectric losses due to the dipole polarization by impurites and sulfure, and of above 7phr was only a loss due to the dipole polarization by sulfure and of natural rubber exhibit two kind of losses due to the interfacial and the dipole polarization. Furthermore, dielectric loss maximun tan spectrum, which removed to the low frequency according to increasing sulfure, depends greatly on sulfure. The volume resistivity of $10^{7}$~$10^{11}$[$\Omega\cdot$cm], regardness whether the crosslinking of rubber are tired by sulfure or, was observed.