cm8b03104_si_002.avi (2.98 MB)
Download fileHigh-Performance Double-Network Ion Gels with Fast Thermal Healing Capability via Dynamic Covalent Bonds
media
posted on 16.10.2018, 00:00 authored by Zhehao Tang, Xiaolin Lyu, Anqi Xiao, Zhihao Shen, Xinghe FanA tough
double-network (DN) ion gel composed of chemically cross-linked
poly(furfuryl methacrylate-co-methyl methacrylate)
(P(FMA-co-MMA)) and physically cross-linked poly(vinylidene
fluoride-co-hexafluoropropylene) (P(VDF-co-HFP)) networks with 80 wt % of ionic liquid (IL) was fabricated
via a one-pot method. This ion gel exhibits excellent mechanical strength
and considerable ionic conductivity, which can be used as a solid
gel electrolyte. Upon an adjustment of the weight ratio of P(FMA-co-MMA) to P(VDF-co-HFP) and the content
of the cross-linker, remarkably robust DN ion gel (failure tensile
stress 660 kPa, strain 268%; failure compressive stress 17 MPa, strain
85%) was obtained. The high mechanical strength is attributed to the
chemical/physical interpenetrating networks. The rigid chemically
cross-linked P(FMA-co-MMA) network dissipates most
of the loading energy, and the ductile physically cross-linked P(VDF-co-HFP) network provides stretchability for the whole gel.
More importantly, the P(FMA-co-MMA) network is formed
by dynamic covalent bonds that can undergo a thermally reversible
reaction, giving the gel a unique and effective thermal healing capability.
Furthermore, with the high content of IL, the DN ion gel possesses
a high ionic conductivity of 3.3 mS cm–1 at room
temperature, which is higher than those of most solid polymer electrolytes
and comparable to those of commercial organic liquid electrolytes.
History
Usage metrics
Read the peer-reviewed publication
Categories
Keywords
healing capabilityDynamic Covalent Bondscross-linkedstress 17 MPaDN ion gelHFPstress 660 kPaHigh-Performance Double-Network Ion Gelsloading energymethyl methacrylatepolymer electrolytesweight ratioion gel exhibitsone-pot methodMMAgel electrolytecovalent bondsHealing CapabilityILroom temperatureion gel