SELECTIVE BETAINISATION OF TERTIARY AMINE METHACRYLATE BLOCK-COPOLYMERS

2-(Dimethylamino)ethyl methacrylate (DMAEMA) was block copolymerised i n turn with three other tertiary amine methacrylate comonomers using g roup transfer polymerisation; the DMAEMA residues of each of these dib lock copolymers were selectively betainised using propane-1,3-sultone under mild conditions to yield a series of novel water-soluble sulfobe taine block copolymers which exhibit reversible pi-I-and temperature-i nduced micellisation.