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采用紫外接枝和与芳纶纤维混杂的方式改善UHMWPE纤维的缺点,详细研究了接枝单体种类、浓度和纤维混杂等对UHMWPE纤维/环氧树脂复合材料性能的影响。结果表明,以丙酮为溶剂采用一步接枝法在紫外光辐射下将丙烯酸接枝到UHMWPE纤维表面上,可显著提高UHMWPE纤维增强的复合材料的弯曲强度、冲击强度和拉伸强度;随着接枝单体浓度的提高弯曲强度和冲击强度没有明显的变化,而拉伸强度不断提高。同时,将UHMWPE纤维与芳纶纤维混杂可提高其与树脂基体生成的复合材料的耐热性。UHMWPE纤维与芳纶纤维按1∶1的质量比混杂,混杂纤维增强的复合材料在90℃的形变量比UHMWPE纤维增强的复合材料减少66.7%,显著提高了复合材料的耐热性。
The defects of UHMWPE fiber were improved by UV grafting and mixed with aramid fiber. The effects of grafting monomer type, concentration and fiber mixture on the properties of UHMWPE fiber / epoxy composite were studied in detail. The results showed that the grafting of acrylic acid onto UHMWPE fiber by UV irradiation with one-step grafting of acetone could significantly improve the flexural strength, impact strength and tensile strength of UHMWPE fiber reinforced composites. There was no significant change in the flexural strength and impact strength of the branched monomer, while the tensile strength increased continuously. At the same time, UHMWPE fiber and aramid fiber can be mixed with the resin matrix to improve the heat resistance of the composite material. The mass ratio of UHMWPE fiber to aramid fiber is 1: 1. The hybrid fiber reinforced composite material has a deformation reduction of 66.7% at 90 ℃ compared with that of UHMWPE fiber reinforced composite material, and significantly improves the heat resistance of the composite.