Poly(α‐methylstyrene) (PMS) macromonomer having one vinylbenzyl group per polymer chain was prepared by the couplings of living PMS with p‐chloromethylstyrene (CMS). Subsequently, well‐defined poly[acrylic acid (AA)‐g‐α‐methylstyrene (MS)] and poly[4‐vinylpyridine (4VP)‐g‐MS] graft copolymers composed of polyelectrolyte trunks were prepared by radical copolymerization of PMS macromonomer with AA and 4VP monomers, respectively. Binary poly(AA‐g‐MS)/poly(4VP‐g‐MS) or poly[AA · triethyl amine (Et3N) salt‐g‐MS)/poly(4VP‐g‐MS) graft copolymer blend films were cast from a benzene/methanol mixture. The morphological results of binary graft copolymer blends are discussed with respect to three‐phase separated structures.
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Ishizu et al. (1991) studied this question.