Preparation and properties of melt-blended carboxyl multi-walled carbon nanotubes/PA66 composite fibers

A series of CMWNTs/PA66 composite fibers were melt-spun with the melt-blended PA66 and 0.1 wt%~3 wt% of carboxylic multi-walled carbon nanotubes chips.The effects of CMWNTs mass fraction on the morphology and mechanical properties of the composite fibers were characterized using SEM,DMA and a tensile strength tester etc.The results show that the CMWNTs are homogeneously dispersed throughout PA66 matrix.Both the Tg and mechanical properties of the composite fiber increase due to the addition of CMWNTs.When the mass fraction of CMWNTs is 0.5%,the storage modulus of CMWNTs/PA66 composite fiber is the highest,which is 5.5 times that of PA66 fiber.The glass transition temperature of the fiber is 27.6 ℃.When the mass fraction of CMWNTs is 0.3%,the initial modulus of CMWNTs/PA66 composite fiber is the highest with an increase of 101.4%.When the mass fraction of CMWNTs is 1%,the breaking strength is the largest with an increase of 48.8%.