Reversible Hardness Variance as a Commonly Observable Phenomenon for Various Amphoteric Gels(Special Issue on strength and Fracture, and Experimental Mechanics)

概要

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Acrylamide-based amphoteric gel containing -COOH and -NH_2 can be hardened through the formation of salt-linkages, - COO^- … ^+H_3N-, which serve as columns to reinforce the gel matrix. These salt-linkages can be formed and disrupted reversibly by the control of ionic strength of bathing solution, resulting in the gel hardness variance. The same kind of salt-linkages were also found to form between immobile -SO_3H and -NH_2 both imported in acrylamide-based gels, in the form of -SO_3^- … ^+H_3N-. It was also observed a reversible formation and disruption of -SO_3 … ^+H_3N- according to the ionic strength of bathing solution. Thus the import of both -SO_3H and -NH_2 groups in a single gel is expected to induce a reversible hardening and softening of gel matrix through the formation of salt-linkages. From this observation, it was strongly speculated that the reversible hardness variance has to be a quite common phenomenon for any type of amphoteric gel.
一般社団法人日本機械学会の論文
2002-10-15