28 May 1999 Shape memory gels with multi-stimuli-responses
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Abstract
The shape memory effect with multi stimuli responses of the hydrogels having the various type of long alkyl chains: poly (stearyl acrylate -co- acrylic acid) p(HA-co-AA), poly(16- acryloylhexadecanoic acid -co- acrylic acid) p(AHA-co-AA), poly(12-acryloyldodecanoic acid -co- acrylic acid) p(ADA-co- AA), and poly (stearyl acrylate -co- methyl acrylate) p(SA-co- MA) were investigated. P(SA-co-AA) gel exhibited the reversible order-disorder transition on heating at 49 degrees Celsius and on cooling at 42 degrees Celsius. The transition was derived from the melting of the hydrophobic domain formed by the long alkyl side chain. The Young's modulus decreased dramatically during the transition. Besides this gel showed the shape memory effect based on the order-disorder transition. The shape of deformed p(SA-co-AA) gel recovered very quickly (5s). In the p(SA-co-MA) gel system, the transition temperature could be varied. Moreover, p(AHA-co-AA) gel responded to not only temperature change but also change of pH and solvent composition. 10
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Tatsuo Kaneko, Takashi Miyazaki, Kanji Yamaoka, Yuichi Katayama, Atsushi Matsuda, Jianping Gong, Yoshihito Osada, "Shape memory gels with multi-stimuli-responses", Proc. SPIE 3669, Smart Structures and Materials 1999: Electroactive Polymer Actuators and Devices, (28 May 1999); doi: 10.1117/12.349678; https://doi.org/10.1117/12.349678
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