Preparation of self-healing, recyclable epoxy resins and low-electrical resistance composites based on double-disulfide bond exchange

Vitrimers have been emerged as a new class of polymers with many attractive properties of material processing such as reshaping, recycling and repairing. Herein, a new type of vitrimers (BDSER) based on thermosetting dynamic epoxy network with double disulfide bonds was synthesized by the reaction of a difunctional epoxy monomer containing disulfide bonds with 4,4'-disulfanediyldianiline (4-AFD). Our results demonstrated that the relaxation time of BDSER at 200 degrees C was as short as 9 s without any catalyst. The storage modulus of BDSER was up to about 2.2 GPa and its glass transition temperature was higher than 130 degrees C. Additionally, the thermodynamic and chemical properties of BDSER were no significant loss after 3 cycles of continuous breaking/compression molding. Furthermore, the resistance of CNT/PPy/Vitrimer composites (CPV), synthesized by doped BDSER with the polypyrrole (PPy) decorated multi-walled carbon nanotubes (WMCNTs), was decreased to 10(9) Omega even the mass ratio was only 1%wt, which could be used a promising candidate as self-repairing materials in the field of antistatic.