Brillouin Scattering Study of the Volume Phase Transition in Poly-N-Isopropylacrylamide Gels

概要

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Brillouin scattering spectra of poly-N-isopropylacrylamide (NIPA) gels swollen to equilibrium in water were measured as a function of temperature both in the swollen and the shrunken phases. This is the first Brillouin scattering experiment on a gel undergoing a volume phase transition. At the discontinuous volume phase transition occuring at 33.6℃, large changes were observed in both of the Brillouin shift and the spectral width. From the measured spectra and the temperature-dependent refractive index of the gel, the hypersonic velocity and the attenuation were determined as a function of temperature. The results are analyzed in terms of the nature of sound propagation in gels, structure of the shrunken phase, relaxation processes of the network and solvent, and a role played by water molecules at the phase transition.
社団法人日本物理学会の論文
1995-08-15