Preparation Of Modified Graphene/SBS Composites And Their Piezoelectric Sensitivity

As a novel piezoelectric material,carbon reinforced polymer composites exhibits excellent piezoelectric property and flexibility.In this study,styrene-butadiene-styrene triblock copolymer covalent grafted reduced graphene(SBS-g-RGO)was used to prepare SBS-g-RGO/SBS composites in order to enhance organic solubility of graphene sheets as well as its dispersion in composites.Once exfoliated from natural graphite,graphene oxide was chemically modified by1,6-hexanediamine(HMDA)to functionalize with amino groups(GO-NH2),then followed by reduction with hydrazine(RGO-NH2).The SBS-g-RGO was finally obtained by the reaction of RGO-NH2 and maleic-anhydride grafted SBS(MA-g-SBS).After that,X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),Raman spectroscopy(Raman),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and thermogravimetric analysis(TGA)were applied to characterize the SBS-g-RGO.The results indicated that the SBS molecules were grafted onto the graphene sheets by covalent bonds,and SBS-g-RGO dispersed well in organic solvent.In addition,the mechanical properties and electrical conductivity property of the SBS-g-RGO/SBS composites showed significant improvement due to the excellent interfacial interaction and homogeneously dispersion of SBS-g-RGO in SBS.What's more,the composites exhibited remarkable piezoresistivity under vertical compression and great repeatability after ten time compression cycles,thus the composites have the potential to be applied in sensor production.