Chlorohydrin Water-Swellable Rubber Compatibilized by an Amphiphilic Graft Copolymer. III. Effects of PEG and PSA on Water-Swelling Behavior

摘要

Chlorohydrin water-swellable rubber-composed of chlorohydrin rubber (CHR), crosslinked polyacrylate (CPA), the amphiphilic compatibilizer poly(vinyl alcohol)-g-poly(butyl acrylte) (PVA-g-PBA), preciitated silica (PSA) ,and poly(ethylene glycol) (PEG)-was prepared. The dispersion of PEG in the blends was characterized by wide-angle X-ray diffraction (WAXD). The dependence of the water absorbing ratio by weight, the water-swelling ratio by volume, and the precentage loss by weight on PEG and PSA contents were investigated. The effects of PEG and PSA on the second water-swelling behaviors and long-term water-retention behaviors were also studied. Optimums for the water-absorbing and water-swelling abilities within the range of the experiment were obtained.