纳米碳酸钙对聚丙烯/碳纤维复合材料力学性能的影响

通过熔融共混的方法分别制备了聚丙烯/碳纤维、聚丙烯/纳米碳酸钙及聚丙烯/纳米碳酸钙/碳纤维复合材料,并研究了碳纤维及纳米碳酸钙对聚丙烯材料增韧增刚的效果。结果表明,少量的碳纤维能够大幅提高聚丙烯材料的弯曲模量,并有一定的增韧效果;表面改性后的纳米碳酸钙能在聚丙烯基体中均匀分散,并大幅提高聚丙烯的缺口冲击韧性,在30%添加量下(重量比)提高幅度达到5.6倍,同时模量也有一定程度提高。将改性后的纳米碳酸钙和碳纤维同时加入聚丙烯基体中,结果显示:在保证纳米碳酸钙均匀分散的前提下,复合材料的缺口冲击强度和弯曲模量可以同时得到大幅度地提升,实现了聚丙烯基复合材料的高刚高韧改性。

Influence of Nano-CaCO3 on the physical properties of carbon fiber reinforced polypropylene nanocomposites

Polypropylene ( PP)/Carbon Fiber ( CF), PP/ nano Calcium carbonate ( Nano-CaCO3 ) binary composites and PP/Nano-CaCO3 /CF ternary composite were prepared through melt blending. The toughening and stiffening effect of CF and Nano-CaCO3 were studied in this paper. The results showed that adding CF can obviously enhance the modulus of PP, and its toughness was also slightly increased. The 30 wt% grafted Nano-CaCO3 can evenly disperse in PP matrix and improve the impact strength by 5. 6 times. Furthermore, the flexural modulus of the PP were enhanced very well. Based on the result, if the Nano-CaCO3 dispersed evenly in PP matrix, the notched impact strength and flexural modulus of the PP can simultaneously increase very well when Nano-CaCO3 and CF were employed. The PP composites had high toughness and stiffness was achieved.