Citation: Liu-qing Yang, Lu Lu, Chao-wen Zhang, Chang-ren Zhou. Highly Stretchable and Self-healing Hydrogels Based on Poly(acrylic acid) and Functional POSS[J]. Chinese Journal of Polymer Science, ;2016, 34(2): 185-194. doi: 10.1007/s10118-016-1744-1
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Herein, we present a novel way for the production of self-healing hydrogels with stretch beyond 4200% than their initial length and relatively high tensile strength (0.1-0.25 MPa). Furthermore, the hydrogel was insensitive to notch. Even for the samples containing V-notches, a stretch of 2300% was demonstrated. The hydrogels were developed by in situ crosslinking of the self-assembled colloidal poly(acrylic acid) (PAA)/functionalized polyhedral oligomeric silsesquioxane (POSS) micelles. This was achieved by the addition of functionalized polyhedral oligomeric silsesquioxane with tertiary amines and hydroxyls (POSS-AH) into the PAA reaction solution. The POSS-AH led to micellar growth, then the dual-crosslinked network was constructed. One type of crosslink was formed by hydrogen-bonding and ionic interactions between PAA chains and POSS-AH, the other type of crosslink was formed by covalent bonds between PAA and bis(N,N'-methylene-bis-acrylamide).
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