Cloud points in aqueous solutions of poly( N -isopropylacrylamide) synthesized by aqueous redox polymerization

The cloud points in aqueous solutions of poly(N-isopropylacrylamide) samples synthesized by aqueous redox polymerization (R) were found to be definitely higher than those of samples previously synthesized by radical polymerization using azobis(isobutyronitrile) as an initiator in tert-butanol (T) and benzene (B). Further, dependence of the cloud point on the weight-average molecular weight Mw for the R sample was found to be opposite to those for the T and B samples.