Synthesis And Characterization Of Graphene Modified Hydrogen Bonding Self-Healing Supramolecular Elastomer

Self-healing materials have attracted more and more researchers’attention because of their excellent self-healing properties.The most important method for preparing the self-healing elastomer material is to introduce non-covalent bond groups such as coordination bonds,ionic bonds and hydrogen bonds to the material.The hydrogen bond self-healing material is the hotspot of researchers because of the dynamic reversibility and orientation.But the strength of hydrogen bond selfhealing material is not easy to meet the requirements,so it is need to be modified by add other materials.Graphene has excellent mechanical properties,such as thermal conductivity,gas barrier properties and so on.So graphene is suitable for modified polymer materials.In this paper,sebacic acid and citric acid were condensed with graphene,diethylenetriamine to synthesize precursors.Then,precursors were reacted with urea and the hydrogen bond selfhealing elastomer was obtained.A series of self-healing elastomers were obtained by changing the amount of graphene oxide.After that,the self-healing elastomer product was characterized by infrared,X-ray diffraction,differential scanning calorimetry,nuclear magnetic resonance and scanning electron microscopy.The results show that the self-healing elastomer contains amide bond,alkylurea and imidazolinone.The infrared spectrum shows that the hydroxyl and amino groups decreased with the increase of grapheme.The strength of self-healing elastomer becomes stronger with the increase of graphene,while the elongation decreases.DSC and XRD results show that with the increase of graphene content,the crystallinity was increased.In addition,we characterized shape memory function of the self-healing elastomer.The effects of temperature and the original shape of the material on the shape memory of the material were studied.The results show that the material is easier to restore to the original shape at higher temperatures;Secondly,the simpler of the original fixed shape,the easier it is to recover.Finally,three kinds of conductive self-healing elastomers were prepared.It is found that SE-PS@RGO has the highest conductivity.And the conductivity of the material increases with the increase of PS @ RGO dosage.Through the above studies,the self-healing elastomer containing rich hydrogen bond groups.GO improve the strength and RGO can improve electrical conductivity of the material,respectively.These self-healing elastomer materials have an application prospects in precision devices and biomedical materials.