Multiple-Responsive Shape Memory Polyacrylonitrile/Graphene Nanocomposites with Rapid Self-Healing and Recycling Properties
writer：CT Cai, Y Zhang, M Li, Y Chen, RC Zhang, XL Wang, Q Wu, TH Chen, PC Sun*
keywords：Crosslink, Diels-Alder, Polymer, Graphene, Nanocomposites, Shape Memory, Self-Healing, Recycling
source：期刊
specific source：RSC Advances, 2017, ASAP
Issue time：2017年
It
still remains a great challenge to endow the polymer materials with multiple
superior material properties by precise molecular design. Herein, we reported a
Diels-Alder (DA) based crosslinked polyacrylonitrile/graphene nanocomposite
(PAN-DA/GR), which has the multiple-responsive properties
of shape memory, self-healing, and reprocessing in addition to the enhanced
mechanical property. The graphene sheets, which are well dispersed in the DA-based
crosslinked PAN network, can act as intrinsic localized thermal sources, by
converting the absorbed external IR/microwave energies into heat, to trigger
the glass transition for elasticity-based shape
memory property and retro-DA (rDA) reactions for healing. The incorporation
of Diels-Alder bonds also renders the material solid state plasticity through topological network rearrangement, and thus leading to versatile shape adaptability. Moreover, both regional shape control and targeted self-healing
of the nanocomposites can be simply achieved by IR laser irridation. Besides,
the incorporation of a small amount of graphene can significantly improve the
mechanical strength with respect to the DA-based crosslinked PAN. Both DSC and
in-situ
variable temperature 13C solid-state NMR experiments was used to
monitor the reversible
DA reactions.