No abstract

A macromonomer was prepared from succinimido methacrylate and poly(N-isopropylacrylamide) (PIPA) with an amino end group. The macromonomer (MA-PIPA) obtained shows a temperature-responsive transition phenomenon from coil to globule in water at about 36 "C. For the copolymer of MA-PIPA with acrylamide (ratio of monomer residues of Nisopropylacrylamide (IPA) and acrylamide (AAm) 10 : 3), the transition temperature of the PIPA chain was the same as that of the macromonomer, whereas the transition temperature of a linear copolymer of IPA and AAm (ratio of the monomer residues 10: 3) was much higher than that of PIPA (52 "C). Microspheres were prepared by emulsion polymerization of the macromonomer and styrene in the presence of sodium dodecylsulfate. The microspheres obtained show a temperature responsiveness in the critical flocculation concentration. The macromonomer prepared here can be used as a component of temperature-sensitive devices in various forms.

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