Effect of Initiating Systems on the Viscoelastic Behavior of SBR-PMMA Interpenetrating Polymer Networks
A series of interpenetrating polymer networks (IPNs) based on styrene butadiene rubber (SBR) and poly [methyl methacrylate] (PMMA) have been synthesized by Sequential polymerization technique. The effect of two initiating systems (Benzoyl peroxide (BPO) and Azobisisobutyronitrile (AIBN)) are employed in the polymerization of MMA during the fabrication of IPN. The viscoelastic properties of these IPNs were investigated in detail in the temperature range of −80 to 200°C and at a frequency of 1Hz. IPNs with 50 wt% of PMMA has broad transitions arising from β- and α-relaxations in PMMA. The morphology of the IPNs was analyzed with TEM images and tried to correlate these results with viscoelastic behavior and their damping properties.