NONISOTHERMAL CRYSTALLIZATION KINETICS AND CRYSTALLINE STRUCTURE OF NYLON 6/FUNCTIONALIZED MULTI-WALLED CARBON NANOTUBE COMPOSITES

摘要

Nylon 6/functionalized multi-walled carbon nanotube (f-MWNT) composites were prepared by mixing the nylon 6 and carboxylic group containing MWNT in formic acid solution. DSC and XRD have been used to investigate the nonisothermal crystallization kinetics and crystalline behavior of nylon 6/f-MWNT composites. DSC data shows that the activation energy (E_a) drastically increases with the presence of 0.25 wt% f-MWNT in nylon 6/f-MWNT composites and then slightly increases with increasing f-MWNT content. These results indicate that the addition of 0.25 wt% f-MWNT into nylon 6 significantly reduces the transportation ability of polymer chains during crystallization process. By adding more f-MWNT into nylon 6 probably induces the heterogeneous nucleation in which the E_a slightly increased. XRD results indicate that the addition of f-MWNT favored the formation of the thermodynamically stable a crystalline structure at various cooling rates, compared to that of pure nylon 6 matrix.