Mechanical Properties,Water Swelling Behavior,and Morphology of Swellable Rubber Compatibilized by PVA-g-PBA

摘要

A novel water swellable rubber (WSR) was prepared by blending chlorohydrin rubber (CHR) with crosslinked polyacrylate (CPA),poly(vinyl alcohol)-g-poly(butyl acrylate) (PVA-g-PBA),precipitated silica (PSA),and polyethylene glycol) (PEG).The amphiphilic graft copolymer PVA-g-PBA was incorporated as the compatibilizer between CHR and CPA.Water swellable-rubber with different grafting percentages and contents of PVA-g-PBA was investigated by SEM,mechanical measurement,and water-swelling tests.The results prove that PVA-g-PBA increased interfacial cohesion between CHR and CPA before and after water swelling,decreased percentage loss by weight,and improved water-swelling behavior.Mechanical properties of WSR were significantly improved by PVA-g-PBA,especially for the blends of 5 phr PVA-g-PBA with G% = 151.7% before water swelling and that with G% - 340.4% after water swelling.