Abstract
It is a common industrial practice to incorporate crosslinked polymer particles into raw elastomers. This results in decreased time and energy of mixing with carbon black. In the system studied, the gel is in the form of discrete particles in contrast to gels formed in bulk. Samples were butadiene‐acrylonitrile copolymer containing 33% acrylonitrile. The crosslinked particles were prepared by adding divinyl benzene in the emulsion‐polymerization recipe. With the exception of the difunctional monomer, the crosslinked particles and the noncrosslinked rubber were prepared in the same manner. The two latices were blended in different proportions. Gel contents of 100, 75, 50, 25, and 0% were examined. The flow behavior of these materials was examined with a capillary rheometer at 70, 100, and 125°C for the shear rate range of 3–3000 sec−1. In the shear rate range studied, the viscosity decreased with increasing gel content. This is contrary to the cases where crosslinking is formed in the bulk, where the viscosity increases significantly with the increase of the crosslinked fraction.
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