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采用马来酸酐接枝乙烯-醋酸乙烯酯共聚物(EVA-g-MAH)对CaSO_4晶须/尼龙6(CaSO_(4W)/PA6)增韧改性。通过双螺杆挤出机制备了CaSO_(4W)/PA6二元、CaSO_(4W)-(EVA-g-MAH)/PA6三元复合材料,用SEM、DSC、XRD等观察和表征了形貌、结构和结晶参数,并测试了力学性能。研究表明:添加少量CaSO_(4W)可提高PA6的结晶速率,而高含量CaSO_(4W)导致PA6结晶速率降低,促进γ晶型形成。添加10%(质量分数)CaSO_(4W)可同时提高PA6的刚性和韧性;添加30%CaSO_(4W)可进一步提高PA6的刚性,但PA6的韧性明显降低。添加2.5%和5%(质量分数)EVA-g-MAH,能使30%CaSO_(4W)-(EVA-g-MAH)/PA6的抗冲击强度分别提高25.0%和76.7%,并使其具有较高韧性。冲击强度的提高主要源于EVA-g-MAH所产生的能量耗散、改善应力的有效传递、增强CaSO_(4W)与PA6的界面以及EVA-g-MAH/PA6共混体系较好的相容性。
The CaSO_4 whisker / nylon 6 (CaSO_ (4W) / PA_6) toughening was modified by maleic anhydride grafted ethylene-vinyl acetate copolymer (EVA-g-MAH) The CaSO 4 W / PA 6 binary and CaSO 4 W - EVA-g-MAH / PA 6 ternary composites were prepared by twin-screw extruder. The morphology, Structure and crystallization parameters, and tested the mechanical properties. The results showed that the addition of a small amount of CaSO 4 could increase the crystallization rate of PA 6, whereas the high content CaSO 4 led to the decrease of PA 6 crystallization rate and the formation of γ crystal. The addition of 10% (mass fraction) CaSO 4 W can improve the rigidity and toughness of PA 6. Adding 30% CaSO 4 W can further increase the rigidity of PA 6, but the toughness of PA 6 is obviously decreased. The impact strength of 30% CaSO 4 W - (EVA-g-MAH) / PA 6 can be increased 25.0% and 76.7% respectively by adding 2.5% and 5% EVA-g- Higher toughness. The improvement of impact strength is mainly attributed to the energy dissipation caused by EVA-g-MAH, improving the effective transfer of stress, enhancing the interface of CaSO 4 and PA 6 and the better compatibility of EVA-g-MAH / PA 6 blends Sex.