不同离子膜基IPMC材料的变形机制比较研究

he preformance of ionic polymer metal composites with different water content and the correlation between the inner water phases with their proportions and the electromechanical responses have been investigated with the total water content to explore the physical deformation mechanisms based on Nafion and Flemion substrate membranes in this paper. At first, the method of proton nuclear magnetic resonance, by measuring the distribution of the transverse relaxation time T2 in the two IPMC samples, has been used to study the inner water phases and their proportions. With the reduction of total water content, it is found that the most obvious is the reduction of the free water. Then the deformation and driven current of the IPMC samples with different water content have been measured under an applied DC voltage. The peak current and the steady current decide the anode deformation in different time scale, and the proportion of the free water is the critical factor of the relaxation. Finally, the complex deformation phenomena of the two IPMC samples have been explained physically based on the theory of swelling deformation, and a phenomenal model also has been proposed and well described the deformation based on multi diffusion processes.