偏光解消レイリー散乱による pNIPA ゲル中の溶質(ピリジン)の配向緩和と体積相転移

概要

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Orientational relaxation of pyridine molecules of neutral poly (N-isopropylacrylamide) (pNIPA) gels in pyridine-water mixtures and aqueous solution of pyridine were investigated by depolarized Rayleigh scattering. Pyridine is known as an optically anisotropic molecule and is soluble in water and have the specific interaction due to the formation of hydrogen bonds between pyridine and water molecules. The Rayleigh relaxation times τ are obtained from the half-width of the experimental spectra. The obtained Rayleigh relaxation time τ for pyridine of gels in pyridine-water mixtures corresponded to the same for aqueous of pyridine solution. These Rayleigh relaxation time τ increases with pyridine concentration, reaches maximum near 60%, and decreases gradually above 60%. From these results, it was found that orientational relaxation of pyridine molecules had relation with the volume phase transition of neutral pNIPA gels.
弓削商船高等専門学校の論文
2001-02-28