English Abstract

Capillary Flow Behavior of the Carbon-black-filled Styrene-butadiene Rubber Compounds

Shinsuke TANI *1
Yoshiyuki IKEDA *1
Shigeru KAGAMI *2
*1:Faculty of Science and Engineering, Konan University, Higashinada-ku, Kobe, Japan
*2:The Yokohama Rubber Co.,LTD., Hiratsuka, Kanagawa, Japan
Nippon Gomu Kyokaishi,(2013),86(9),279-284 Original Paper in Japanese

The rheological properties of carbon-black-filled styrene-butadiene rubber (SBR) compounds of various molecular weight were investigated. Melt fracture phenomena occurred dependent on quantity of added carbon-black and molecular weight of SBR. The extrusion pressure and the apparent shear-rate were determined using a capillary rheometer with the nozzles different L/D ratios. From relationships between shear stress and shear-rate, slip velocity, flow rate(Q) and slip flow rate (Qs) were estimated. At a low shear stress, the ratio of slip quantity Qs/Q showed nearly 1, but it decreased with increasing shear stress. Change of Qs/Q in the case of high molecular weight SBR samples was larger than low molecular weight SBR. From the results of dynamic strain dispersion of non-vulcanized samples, storage modulus largely decreased with increasing quantity of carbon-black filler and strain.

Keywords: Capillary Flow Behavior, Styrene-butadiene Rubber, Carbon-black, Slip Flow Rate, Bagley correction, Payne effect