مطالعه سازوكارهاي بهبوددهنده مقاومت در برابر پارگي در سامانه هاي تقويت كننده دوده /سيليكا/سيلان

Assessments on the Tear Resistance Improvement Mechanisms in the Carbon Black/ Silica/ Silane Reinforcement Systems

Tear resistance of 1,4-cis butadiene rubber in two reinforcement systems of carbon black / silica and carbon black / silica / silane may be improved with different mechanisms. These mechanisms were investigated by studying the dissipation processes and polymer filler interactions, with the aid of resilience, modulus and bond rubber experiments. In these systems, the effect of filler-polymer interactions on stress-crystallinity phenomena can be enormous on tear resistance. We have shown that in presence of silica and absence of silane coupling agent, the tear energy consumption via hysteric losses, due to irreversible processes, is the main mechanism in tear resistance improvement. In presence of silane coupling agent, however, and because of instruction of silica-silane-rubber chemical bonding, the tear energy consumption mechanism will dominate by breaking the chemical bonds across the fracture surface.