Influence of Network Structure and Hydration on Viscoelastic Behavior of N-Isopropylacrylamide Gel

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Yuri Nakano¹  Yoshimi Seida¹  Yoshio Nakano¹ 

[1] Department of Environmental Chemical and Engineering, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology

关键词: Thermosensitive Polymer Gel;    Quartz Crystal Microbalance;    Viscoelastic Behavior;    Phase Separation;    Hydration;   

DOI  :  10.1252/jcej.09we033

来源: Maruzen Company Ltd

【 摘 要 】

References(20)The viscoelastic behavior of thermoresponsive poly(N-isopropylacrylamide) (PNIPA) microgel was investigated as a function of the preparation temperature Tprep using a 5 MHz quartz crystal microbalance (QCM). The viscoelastic behavior was determined on the basis of the resonant frequency F and resistance R of the QCM by means of impedance analysis of the QCM. The viscoelastic behavior was found to vary as a function of Tprep and/or the network and hydration structures of the gels. Large changes were induced in the viscoelasticity in response to thermal stimuli in the gels prepared below the lower critical solution temperature (LCST) of PNIPA. The changes were due to the homogeneous network structure of the gels with a large amount of hydrated water. Changes in the viscoelasticity of the gels prepared above the LCST were much smaller due to the porous network of the gels with a small amount of hydrated water. The use of QCM enabled the precise observation of network and hydration structures of the gels during the stimuli-responsive process from the viewpoint of the viscoelasticity.

【 授权许可】

Unknown