Chlorohydrin water-swellable rubber compatibilized by an amphiphilic craftcopolymer. III. Effects of PEC and PSA on water-swelling behavior

Chlorohydrin water-swellable rubber-composed of chlorohydrin rubber (CHR), crosslinked polyacrylate (CPA), the amphiphilic compatibilizer poly(vinyl a lcohol)-g-poly(butyl acrylate) (PVA-g-PBA), precipitated silica (PSA), and poly(ethylene glycol) (PEG)-was prepared. The dispersion of PEG in the blen d 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 percentage loss by weight on PEG and PSA contents were investigate d. The effects of PEG and PSA on the second water-swelling behaviors and lo ng-term water-retention behaviors were also studied. Optimums for the water -absorbing and water-swelling abilities within the range of the experiment were obtained. (C) 2001 John Wiley & Sons, Inc.