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.