Filler Gel and Rubber Gel in Silica- Filled Rubber Systems
Masayoshi ITO*1
Shigeyuki ONO*2
*1Department of Chemistry , Faculty of Science , Tokyo University of Science , Tokyo Japan
*2Engineering Department, Boots division, The NOK Co., Ltd., Shizuoka , Japan
Nippon Gomu Kyokaishi,(2004),77(11),375-381 Original Paper in Japanese

An examination was carried out on the quantitative analysis of bound rubber in silica-filled rubber systems by a thermal gravimetric analyzer (TGA), transmission electron microscopy (TEM) and pulsed NMR. The bound rubbers in solution mixed composites were primarily composed of filler gel which corresponded to the entrapped rubber phase in the agglomerate of silica particles. The amounts were well correlated with the averaged size of agglomerate of silica particles () in the composites. The for mechanically mixed composites was to of for solution mixed composites. Thus, most of the bound rubbers in the mechanically mixed composites were composed of rubber gel which corresponded to the chemically cross-linked rubber phase in the composites. The difference of segmental mobility between filler gel and rubber gel was detected by pulsed NMR. The mobility was higher for rubber gel than for filler gel.

(Received on March 25, 2004)
(Accepted on August 13, 2004)

Filled rubber, Filler gel, Rubber gel, Silica, Agglomerate size, Bound rubber