Gel and Rubber Gel in Silica- Filled Rubber Systems
*1Department of Chemistry , Faculty of Science , Tokyo University of
Science , Tokyo Japan
*2Engineering Department, Boots division, The NOK Co., Ltd., Shizuoka
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
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,