Journal
MACROMOLECULAR MATERIALS AND ENGINEERING
Volume 302, Issue 2, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.201600359
Keywords
graphene oxide; multiple shape memory; poly(acrylic acid); self-healing; tough hydrogel
Funding
- NSFC [51573060, 21427805]
- National Basic Research Program of China (973 Program) [2012CB821504]
- Fundamental Research Funds for the Central Universities [2015ZM051, 2015ZP005]
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A multiple shape memory and self-healing poly(acrylic acid)-graphene oxide-Fe3+ (PAA-GOFe(3+)) hydrogel with supertough strength is synthesized containing dual physically crosslinked PAA network by GO and Fe3+. The first GO cross-linked hydrogel can be reversibly reinforced by immersing in FeCl3/HCl and pure water and softened by immersing in HCl. The tensile strength is 2.5 MPa with the break strain of 700%. Multiple shape memory capability is found depending on this unique feature, the hydrogel can be fixed in four temporary shapes by adjusting the immersing time in FeCl3/HCl and pure water, and recovered in sequence by immersing in HCl. This hydrogel also exhibits perfect self-healing behavior, the cut as-prepared hydrogel is almost completely healed by immersing in FeCl3/HCl. Besides, the hydrogel shows enhanced electrical conductivity with the presence of GO and Fe3+. This supertough hydrogel provides a new way to design soft actuators.
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