Dielectric properties of thermally degraded chloroprene rubber
Dielectric properties of thermally degraded chloroprene rubber
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DOI：
10.1016/j.polymdegradstab.2010.08.003
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发表时间：
2010-12
影响因子：
5.9
通讯作者：
H. Kuwahara;S. Sudo;M. Iijima;S. Ohya
中科院分区：
文献类型：
--
作者：
H. Kuwahara;S. Sudo;M. Iijima;S. Ohya
我们对热老化炭黑填充氯丁橡胶(CR)进行了介电测量。在未老化和热老化的CR中观察到初级和次级突起。第一个过程是氯丁二烯链在氯丁橡胶中的协同运动，第二个过程是氯丁二烯链的局部运动。对于初级过程，随着时效时间的延长，弛豫时间略有增加，损耗谱的对称形状参数减小。对于二次工艺，松弛强度随时效时间的延长而降低，50h后达到零。介电松弛参数的这些变化是由于氯丁二烯链上脱氯化氢反应的进展。
We performed dielectric measurements on thermally aged carbon-black-filled chloroprene rubber (CR). Primary and secondary processes were observed in unaged and thermally aged CR. The primary process is due to the cooperative motion of chloroprene chains in CR, and the secondary process is due to the local motion of chloroprene chains. For the primary process, the relaxation time slightly increases and symmetric shape parameter of the loss spectrum decreases with increasing aging time. For the secondary process, the relaxation strength decreases with increasing aging time, and reaches zero after 50h. These changes in the dielectric relaxation parameters are due to the progress of the dehydrochlorination reaction at the chloroprene chains.