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

• Published in: Composites science and technology 2018-10, Vol.167, p.79-85
• Main Authors: Zhou, Fengtao, Guo, Zijian, Wang, Wenyan, Lei, Xingfeng, Zhang, Baoliang, Zhang, Hepeng, Zhang, Qiuyu
• Format: Article
• Language: English
• Subjects: A: Functional composites; Antistatics; B: Thermomechanical properties; C: Stress relaxation; Catalysts; Chemical properties; Chemical synthesis; Electric resistance; Epoxy resins; Glass transition temperature; Maintenance; Molds & molding; Multi wall carbon nanotubes; Organic chemistry; Polymer matrix composites; Polymers; Polypyrroles; Pressure molding; Relaxation time; Reversible covalent bond; Self healing; Self healing materials; Storage modulus
• ISSN: 0266-3538; 1879-1050
• DOI: 10.1016/j.compscitech.2018.07.041

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 °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 °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 109 Ω even the mass ratio was only 1%wt, which could be used a promising candidate as self-repairing materials in the field of antistatic.