Abstract
AbstractDeuterium isotope effects on swelling kinetics and volume phase transition in typical polymer hydrogels (poly(N‐isopropylacrylamide) and polyacrylamide gels) are discussed. Deuterium substitutions affect on the swelling kinetics and volume phase transition of the polymer hydrogels. The slower swelling kinetics of hydrogels in D2O than in H2O arises mainly from the high viscosity of the medium. The deuterium isotope effect on the swelling‐shrinking curve of hydrogels would come from the different polymer‐solvent interaction. The microenvironments of hydrogels studied by solvatochromic fluorescence probe are compared with the bulk state. The zipper‐type hydrogen‐bonding inter‐polymer complexes (poly(acrylic acid)‐polyacrylamide and poly(acrylic acid)‐poly(N‐acryloylglycineamide)) are also investigated and show the huge isotope effect on the phase separation temperature.
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