High performance polyamide 6 composites prepared by reactive extrusion

Abstract

To improve the properties of polyamide 6 (PA6) composites, a series of modified PA6 composites was prepared by reaction extrusion. An amorphous PA6 was first obtained by the complexing reaction of Li 1 in lithium chloride with amino groups, and then epoxy resins, nano-SiO 2 as well as POE-g-MAH were in turn added into the PA6/LiCl 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 calorimetry (DSC), dynamic mechanical analysis (DMA), scanning electron microscopy (SEM), and mechanical properties tests. The results demonstrated that PA6 was amorphous at 6 phr lithium chloride and a network structure was formed in PA6 matrix in the presence of epoxy resins, thus the mechanical properties of composites greatly were enhanced. However too many nano-SiO 2 particles might impair the tensile strength of PA6 composites. Additionally, a PA6 composite with excellent properties was obtained in the presence of POE-g-MAH due to the crystal form change in PA6 matrix and the strong interaction between PA6 and POE-g-MAH. POLYM. COMPOS.,

Effect of LiCl on the miscibility and crystallization behavior of a hydrophilic PP/PP-g-MAH/PA6 blend

“…The mechanism of LiCl as a catalyst is in the form of a complex between it and other reactants, which has been proposed in the literature [7][8][9][10]. In our past work, it was observed that LiCl could react with the amide groups of PA6 by complexing, which changed its crystallization behavior [11]. On the basis of above mentioned knowledge and results, LiCl may promote the acetylation reaction of anhydride groups of PP-g-MAH with amino end groups of PA6 and further the miscibility of PP/PP-g-MAH/ PA6 blends.…”

Thermal properties and crystallization kinetics of a new polypropylene–polyamide 6 composite

“…15,16 However, in our previous study, it was observed that LiCl could react with the amide groups of PA6 by complexing, which changed its crystallization behavior and an amorphous PA6 was obtained in the presence of more LiCl. 17 Therefore, based on the above results, LiCl will be added in the process of preparing PP-PA6 composites with excellent properties besides maleic anhydride-grafted polypropylene (PP-g-MAH) as a compatibilizer. It is expected to find out how LiCl will affect the crystallization behavior of PP by its effect on PA6 phase, about which there was no report.…”