Frequency Dependency of Electrical Property Stabilization during Vulcanization of Modified NR/IR Blends

Frequency dependency or electrical property stabilization during vulcanization of modified NR/IR composite materials was studied using in-situ electrical property measuring technique. Volume resistivity(p) before and after vulcanization reaction of the sample was measured as the function or frequency in the range or 1Hz to 10kHz at reaction temperatures of 130, 140, 150, and , respectively. A double stabilization mode of frequency dependency was observed, in which a slow stabilization process of p to a value of ca. occurred after a drastic initial decrease from ca. . In addition, notable temperature dependencies of p values were also observed before and after vulcanization reaction, that is, p values at 130 and after vulcanization were observed as about 1/3 of those values before vulcanization. All the observed facts were considered as the results from the interaction between the electrode and the bulk sample materials, i.e., electronic charge-discharge, and from the structure change of samples including CB rearrangement by the vulcanization.