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Multiple Shape Memory, Self‐Healable, and Supertough PAA‐GO‐Fe 3+ Hydrogel
Author(s) -
Zhao Lei,
Huang Jiahe,
Wang Tao,
Sun Weixiang,
Tong Zhen
Publication year - 2017
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201600359
Subject(s) - materials science , shape memory alloy , self healing hydrogels , self healing , ultimate tensile strength , acrylic acid , composite material , oxide , graphene , chemical engineering , polymer chemistry , nanotechnology , polymer , copolymer , medicine , alternative medicine , pathology , engineering , metallurgy
A multiple shape memory and self‐healing poly(acrylic acid)‐graphene oxide‐Fe 3+ (PAA‐GO‐Fe 3+ ) hydrogel with supertough strength is synthesized containing dual physically cross‐linked PAA network by GO and Fe 3+ . The first GO cross‐linked hydrogel can be reversibly reinforced by immersing in FeCl 3 /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 FeCl 3 /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 FeCl 3 /HCl. Besides, the hydrogel shows enhanced electrical conductivity with the presence of GO and Fe 3+ . This supertough hydrogel provides a new way to design soft actuators.