Changes in the microenvironment of pyrene-labeled copoly(acrylamide-acrylic acid) gels are investigated by means of fluorescence spectroscopy. An anomaly in the microscopic motion of a pyrenyl probe was observed in the vicinity of the phase transition: the average lifetime of monomer emission approached zero, and the rotational diffusion constant of pyrenyl probe became infinite. Density fluctuation and the nonequilibrium situation near the phase transition are considered to cause the rapid microscopic fluctuation of the network and solvent molecule.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)