A Tough and Efficient Self-Healing Supramolecular Materials modulated with WCNT-NH2

2nd International Conference on Mechanical Engineering and Applied Composite Materials

机械制造;材料工程

Ma, H.R.^1 ; Li, Y.X.^1 ; Jiang, C.^1 ; Yao, Y.W.^1 ; Yao, C.^1

College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing

211816, China^1

关键词: Carbon nanotubes composites;    Covalently cross-linked;    Functionalized carbon nanotubes;    Polyamidoamine dendrimers;    Self-healing polymers;    Self-healing properties;    Supramolecular materials;    Synthesized materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/544/1/012014/pdf
DOI  :  10.1088/1757-899X/544/1/012014

来源: IOP

【 摘 要 】

Self-healing polymers crosslinked by solely reversible bonds are intrinsically weaker than common covalently crosslinked networks. In this work, a self-healing materials with excellent mechanical properties was synthesized by a new design strategy, wich is to introduce covalent into reversible networks to improve its mechanical properties. First, polyamidoamine dendrimer oligomers (PAMAM-Oligomers) was synthesized. Then amine functionalized carbon nanotubes (WCNT-NH2) reacted with PAMAM-Oligomers to form a polyamidoamine carbon nanotubes composite materials (PAMAM-WCNT-NH2). The synthesized materials behave as rubber and exhibit spontaneous self-healing behaviour at room temperature without external stimuli. The mechanical and self-healing properties are closely related to the content of WCNT-NH2. For 0.5wt% WCNT-NH2 in the materials, the strain of the material is 330% and tensile strength is 0.6 MPa. Importantly it can improve the self-healing efficiency to 98% of its original tensile strength in 2h.