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Stretchable Self-Healing Polymeric Networks with Recyclability and Dual Responsiveness
journal contribution
posted on 2020-02-07, 22:45 authored by Xingyi Dai, Yuzhang Du, Yansong Wang, Yuncong Liu, Nianxi Xu, Yifan Li, Dongzhi Shan, Ben Bin Xu, Jie KongIntelligent polymers
with tough networks are of considerable significance
for the development of highly proficient polymer science and technology.
In this work, polymeric elastomers with integrated stretchable and
self-healable characteristics were designed by cross-linking hyperbranched
polymers with flexible segments. The hyperbranched polymer with multiple
terminal groups provided various cross-linking points so that mechanically
robust networks could be achieved. Driven by the reversibility of
imine and disulfide bonds employed, the elastomers exhibited good
self-healing property, and the healing efficiency reached up to 99%
under ambient environments. Furthermore, the dynamic reversibility
of the polymers was investigated at the molecular level. The imine
and disulfide bonds were incorporated into the networks to construct
a soluble and recyclable hyperbranched polymer with pH and redox responsiveness
via an A2 + B3 approach and Schiff base polymerization.
The polymers containing imine bonds completed the polymerization–depolymerization
transition and underwent reversible cycles several times through changing
pH. Moreover, in the presence of disulfide bonds, the polymers were
provided with a redox cleavage property triggered by dithiothreitol.
This study provides new opportunities for the design and application
of intelligent polymers with tough networks through regulation of
topological structures.