PA 6/EPDM-g-MAH/HDPE三元共混物的形态与性能

摘要

Polyamide(PA)6/maleic anhydride grafted ethylene-propylene-diene monomer(EPDM-g-MAH)/high density polyethylene(HDPE) ternary blends were prepared via one- and tow-step methods, respectively. The effects of different processing methods on morphology and mechanical properties of the ternary blends were studied. The results indicate that the shell-core coating morphology formed in the PA 6/EPDM-g-MAH/HDPE ternary blend prepared by two-step method is more perfect than that prepared by one-step method. The Izod notched impact strength of the blend prepared by one-step method is 24.50 kJ/m2,which is about one-third of that prepared by two-step method. The fibrillation of dispersion phase particles with shell-core coating morphology in PA 6/EPDM-g-MAH/HDPE ternary blend can absorb plenty of fracture impact energy and pre-vent micro-crack further propagating,thus the impact toughness of the ternary blend is increased.%分别采用一步法和两步法制备了聚酰胺（PA）6/马来酸酐接枝三元乙丙橡胶（EPDM-g-MAH）/高密度聚乙烯（HDPE）三元共混物，研究了不同加工方法对三元共混物形态和力学性能的影响。结果表明：与一步法相比，采用两步法所制PA6/EPDM-g-MAH/HDPE三元共混物形成了更加完善的壳-核包覆形态；用一步法所制共混物的悬臂梁缺口冲击强度为24.50kJ/m2，约为用两步法所制共混物的1/3；具有壳-核包覆形态的分散相粒子在受到应力时发生纤维化，纤维的形成能够吸收大量的断裂能以及阻止裂纹的扩展，从而提高共混物的韧性。