Abstract

AbstractWe have prepared the amidinium‐carboxylate salt bridge‐based supramolecular polymer gels from random copolymer of n‐butyl acrylate and acrylic acid and a linear polyamidine having N,N′‐di‐substituted acetamidine group in the main chain. The supramolecular polymer gel with equimolar amounts of carboxy and amidine groups shows a high G′ value of 1.6 MPa at 25°C. In contrast, the gel prepared from the carboxy polymer and linear polyethyleneimine instead of the polyamidine shows liquid‐like fluidity with a G′ value of 0.01 MPa at 25°C. The robustness of the amidine‐based supramolecular polymer gels is attributed to the high stability of the amidinium‐carboxylate salt bridge. Replacing the random copolymer with carboxy‐terminated telechelic poly(n‐butyl acrylate) results in a significant decrease in G′ as well as |η*|, which may arise from the difference in the network structure due to the arrangement of carboxy groups.

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