Abstract
Shape memory gels (SMG) are kinds of functional materials that can be deformed plastically at lower temperature and be fixed at deformed shape. Further more, the SMG recover their original shape at higher temperature. We had developed a novel type of the SMG by using stearyl acrylate (SA) and /V,A^-dimethylacrylamide (DMAAm) as monomers. We had succeeded in improving its mechanical properties and transparency by changing the hydrophilic monomer from acrylic acid to the SA. However we consider that further improvement of the functions of SMG is needed to utilize the SMG for industrial products actually. Thus here we tried to improve the conductivity of the SMG to be controlled by Joule heat. Carbon black was added to SA-DMAAm SMG, where the molar ratio of SA to DMAAm was 1:3, and the weight ratio of carbon black to DMAAm was 1/100. While the maximum strain and maximum stress of the carbon-added SMG decreases in comparison with normal SA-DMAAm gels, the Young's modulus of SA-DMAAm carbon gels increases. Moreover, small angle x-ray scattering was done to confirm the existence of the crystalline structure due to the SA, regardless of the addition of carbon black.
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