Abstract
The changes in microenvironments during a pH-induced volume transition of poly(acrylamide) (PAAm) gels with a dansyl group as a fluorescent probe in an acetone/water (9/11) mixed solvent have been studied. Irrespective of the presence or absence of fluorescence probe groups labeled on the network of PAAm gels, the gels are in the collapsed state at pH=1.0-5.0. They show a discontinuous volume phase transition (DVPT) at pH=5.1 and remain swollen up to pH=9.6. The fluorescence anisotropy ratio also changes at pH= 5.1 for the dansyl group, but the peak shift of the fluorescence spectra of the dansyl group takes place at pH= 3.8, i.e. before the DVPT
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