Thermal Degradation Kinetic Study of Expanded Perlite-Modified Butadiene Rubber Composites

Mineral-rubber composites based on phosphorylated butadiene rubber (PhBR), including pure expanded perlite (EP) and modified phosphorylated expanded perlite (PhEP) as fillers, are developed. The process involves forming PhBR and its composites-EP/PhBR and PhEP/PhBR-through the oxidative chlorophosphorylation (OxCh) reaction. An in-depth comparative analysis is conducted on the thermal destruction of the PhBR matrix and the EP/PhBR, and PhEP/PhBR composites. The thermogravimetric (TG)/differential thermogravimetry (DTG) analyses reveal three stages of thermal degradation for the PhBR matrix and both composites, highlighting the notable effects of EP and PhEP in the second and third stages of the degradation process. In comparison, the PhEP/PhBR composite exhibits reduced weight loss, the highest integral procedural decomposition temperature (IPDT) value, and a lower Tmax on the DTG curve, compared with the EP/PhBR composite and the PhBR matrix. The mechanism of the thermal destruction reaction and the kinetic parameters Ea and A are calculated using the model-fitting Coats-Redfern method. Mineral-rubber composites are developed using phosphorylated butadiene rubber (PhBR), expanded perlite (EP), and phosphorylated EP (PhEP) fillers. PhBR, EP/PhBR, PhEP/PhBR undergo synthesis through oxidative chlorophosphorylation. Thermal analyses of PhBR and composites reveal three degradation stages. PhEP/PhBR, due to filler-matrix interactions, shows reduced weight loss, surpassing EP/PhBR and PhBR. Kinetics of thermal degradation are studied using Coats-Redfern method. image