Preparation of polyamide 6 microfiber reinforced polypropylene composite and its property of chemical foam injection molding
T he effect of compatibilizer on the nanofibril morphology,viscoelasticity,mechanical properties,and CFIM behavior of polypropylene(PP)/nylon6(PA6)composite through a combination of in-situ fibrillation(INF)and chemi-cal foam injection molding(CFIM)technologies.The results indicated that the addition of PP-g-MAH compatibilizer re-duced the size of PA6 dispersion phase significantly,and PA6 microfibers were uniformly distributed in the PP matrix with an average diameter of about 265nm.The existence of a microfiber network structure and the synergistic enhance-ment effect of phase interface improved the mechanical strength of INF composites significantly.The tensile strength and impact strength of the composites are 26.2% and 62% higher than those of pure PP,respectively.Based on the CFIM experiment using the self-made endothermic-exothermic equilibrium chemical foaming agent,the INF composite foam product was prepared with a cell size of 62 μm and a cell density of nearly 5×105 cells/cm3.The as-prepared sample ob-tained a decrease in the weight by 12% .Compared to pure PP foam,the composite foam exhibited an increase in the specific tensile strength and impact strength by 17% and 46%,respectively.
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