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28 May 1999 Chemomechanical behaviors of polymer gels by surfactant binding
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A weakly crosslinked poly(2-acrylamido-2-methylpropanesulfonic acid) immersed in cationic surfactant (N-n-alkylpyridinium chloride) shows biomimetic chemomechanical movement under dc current. The principle of the movement is based on an electrokinetic molecular assembly reaction of the surfactant onto the polymer network. In order to analyze the diffusion and binding processes which are both of importance for understanding the alkyl size dependence of the chemomechanical behavior, kinetic studies of the surfactants binding were made systematically changing the alkyl size and concentration of the surfactants and ionic strength. It was found that the driving force of the surfactant diffusion is the electrochemical potential gradient, while the surfactant binding enhances the diffusion proces. A mathematical model for the surfactant diffusion was developed taking account of the surfactant binding process and obtained results were well explained the experimental observations.
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Tetsuharu Narita, Jianping Gong, and Yoshihito Osada "Chemomechanical behaviors of polymer gels by surfactant binding", Proc. SPIE 3669, Smart Structures and Materials 1999: Electroactive Polymer Actuators and Devices, (28 May 1999);


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