BRILLOUIN-SCATTERING STUDY OF THE VOLUME PHASE-TRANSITION IN POLY-N-ISOPROPYLACRYLAMIDE GELS

被引：26

作者：

HIROTSU, S ^{[1
]}

YAMAMOTO, I ^{[1
]}

MATSUO, A ^{[1
]}

OKAJIMA, T ^{[1
]}

FURUKAWA, H ^{[1
]}

YAMAMOTO, T ^{[1
]}

机构：

[1] YOKOHAMA NATL UNIV, FAC EDUC, HODOGAYA KU, YOKOHAMA, KANAGAWA 240, JAPAN

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1995年 / 64卷 / 08期

关键词：

PHASE TRANSITION; POLYMER GEL; BRILLOUIN SCATTERING; ELASTIC PROPERTIES; SOUND ATTENTIATION; REFRACTIVE INDEX;

D O I：

10.1143/JPSJ.64.2898

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 brst Brillouin scattering experiment on a gel undergoing a volume phase transition. At the discontinuous volume phase transition occuring at 33.6 degrees C, 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.

引用

页码：2898 / 2907

页数：10

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