High Performance Polyamide 6 Composites Prepared by Reactive Extrusion

摘要

To improve the properties of polyamide 6 (PA6) composites, a series of modified PA6 composites was prepared by reaction extrusion. An amorphous PAG was first obtained by the complexing reaction of Li~+ in lithium chloride with amino groups, and then epoxy resins, nano-SiO2 as well as POE-g-MAH were in turn added into the PA6/LiCI system. The effect of different additives on the crystallization behavior and mechanical properties of PA6 composites was well-studied by X-ray diffraction (XRD), differential scanning calorime-try (DSC), dynamic mechanical analysis (DMA), scanning electron microscopy (SEM), and mechanical properties tests. The results demonstrated that PAG was amorphous at G phr lithium chloride and a network structure was formed in PAG matrix in the presence of epoxy resins, thus the mechanical properties of composites greatly were enhanced. However too many nano-SiO2 particles might impair the tensile strength of PAG composites. Additionally, a PAG composite with excellent properties was obtained in the presence of POE-g-MAH due to the crystal form change in PAG matrix and the strong interaction between PAG and POE-g-MAH.