Summary
A new method of crosslinking of polystyrene using difunctional chloromethylated crosslinking agents is reported. The solution crosslinking took place in dichloroethane with SnCl4 as a catalyst at 80°C and with molar ratios of polystyrene to crosslinking agent ranging from 1∶2 to 12∶1. The crosslinked networks prepared by this method had thermal transitions considerably affected by the degree of crosslinking. Ion-exchange resins were prepared by sulfonation of these networks. Water swelling ratios as high as 16.2 were measured leading to indications about the physical structure of these networks.
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Peppas, N.A., Bussing, W.R. & Slight, K.A. Structure of friedel-crafts crosslinked polystyrene and sulfonated resins thereof. Polymer Bulletin 4, 193–198 (1981). https://doi.org/10.1007/BF00263061
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DOI: https://doi.org/10.1007/BF00263061