Preparation And Properties Of Carbon Nanotubes/Polyalkene Nanocomposites

Three kinds of processes of sidewall electrophilic addition, atom transfer radical polymerization and oxidation in short time were used for chemical modification of carbon nanotubes (CNTs) in this paper. The original and modified CNTs were all characterized by FTCR, SEM, TGA. The results indicated that there were new groups in CNTs which were modified.For the first time, CNTs/CPE composites were prepared in two ways of mechanical blending and solution co-precipitation. The mechanical properties, morphological structure, Theological behavior and dynamic mechanical properties of composites were researched systematically. The results showed that the tensile strength and elongation at break of composites prepared in solution co-precipitation were higher than those of the composites made of mechanical blending. The dispersion of CNTs in polymer matrix and the interaction between polymer matrix and CNTs improved greatly after modification. The tensile strength of the composites was stronger than that of matrix. The CNTs increased the apparent viscosity of composites. The elasticity modulus of the composites was much bigger than that of CPE in low temperature, and glass transition temperature was a little higher than that of CPE.CNTs/HDPE and CNTs/LCPE composites were prepared by mechanical blending, and the mechanical properties, morphological structure, rheological behaviors and thermal properties of composites were discussed. The result revealed that the CNTs enhanced the yield strength and tensile modulus of composites and CNTs/LCPE composites had a greater improvement than CNTs/HDPE composites. Both the dispersion of CNTs in LCPE and the interfacial adhesion between CNTs and matrix...