Key result
Deuterium isotope effects in the bulk changes of poly(N-isopropylacrylamide) and polyacrylamide gels show opposite behavior, but their microenvironment changes display similar characteristics.
Deuterium isotope effects on the microenvironment of poly(N-isopropylacrylamide) and polyacrylamide gels show similar characteristics despite opposite bulk change behaviors.
We have investigated the deuterium isotope effects on the microenvironment of the swelling-shrinking state of typical aqueous polymer gels (poly(N-isopropylacrylamide) gel and polyacrylamide gel) in aqueous binary solutions (methanol/water and acetone/water) by using a fluorescence probe. For comparison, we have also investigated the microenvironment of the linear polymers in the binary mixtures by using a fluorescence probe. Interestingly, the deuterium isotope effects in the bulk changes of poly(N-isopropylacrylamide) gel and polyacrylamide gel in the low organic-solvent composition region show opposite behaviour to each other, but the deuterium isotope effects in the microenvironment changes of (poly(N-isopropylacrylamide) gel and polyacrylamide gel display similar characteristics.
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Shirota et al. (2000) studied this question. Deuterium isotope was evaluated on Microenvironment of the swelling-shrinking state of aqueous polymer gels. Deuterium isotope effects in the bulk changes of poly(N-isopropylacrylamide) and polyacrylamide gels show opposite behavior, but their microenvironment changes display similar characteristics.
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