Preparation And Properties Of SBS Grafted Carbon Nanotubes And Their Composites

In the paper we we used the covalence grafted to bring the activity mass on the surface of carbon nanotubes(CNTs)with purpose of surface graft modification,so as to reduce the CNTs toughest reunion.This indicates the uniform and homogeneous dispersion and the strong interfacial adhesion between nanotubes and matrix are established.The CNTs were carried out hydrorylation,amino and maleric anhydride of MA-g-SBS,then we synthesized a SBS-g-CNTs material by covalent chemical bonding grafted.And 90wt%SBS molecules were attached onto the surface of MWNTs by mass.Result of analysis with infrared spectroscopy,XPS,thermal gravimetric analysis,transmission electron microscopy showed that modified carbon nanotubes successfully grafted poly(styrene-b-butadiene-b-styrene).The incorporation of CNTs into the SBS matrices significantly improved its electrical conductivity,thermal and mechanical properties.The results have been shown that the tensile strength of the 3wt%CNTs composite was improved 56.3%as compared to neat SBS,and young's modulus of the composites was also increasing with the increasing CNTs contents.Then we use the thermodynamic analysis method thermal gravimetric analysis,DMA analysis of the reasons for the improvement of the mechanical properties of the composite materials.With the increasing CNTs contents,the electrical resistivity of the composites was decreased.The Seepage zone of the conductive nanocomposites was found to be betweenl.Owt%-3.0wt%.This percolation threshold was 2.0wt%.The well-dispersed composites had resistance-pressure sensitivity,and the curves of resistivity-deformation had a good repeated pattem.Therefore,a stretchable and elastic conductive polymer nanocomposite was successfully fabricated.