紫外辐射接枝改性UHMWPE纤维表面的研究

采用紫外辐射接枝方法对超高相对分子质量聚乙烯(UHMWPE)纤维表面进行改性。探讨了单体种类及浓度、引发剂、抗氧剂、接枝方法等对UHMWPE纤维表面处理效果的影响,测试了以其作为增强材料的复合材料的层间剪切强度。结果表明:在有氧开放体系下,气相接枝效果好于液相接枝;丙烯酰胺单体的接枝效果优于其它单体;接枝率随接枝单体浓度和接枝时间的增加而增加。采用丙烯酰胺为接枝单体,在光强度为86μW/cm~2条件下,对UHMWPE纤维进行紫外辐射接枝改性,按照一定铺层方式制备的环氧基复合材料的层间剪切强度从未处理的14.59MPa提高到17.36MPa。

Study on surface graft modification of UHMWPE fiber by UV irradiation

The surface modification of ultrahigh-relative molecular weight mass polyethylene(UHMWPE)fiber was conducted via ultraviolet irradiation grafting technology.The effects of monomer variety and concentration,initiator,antioxidant and grafting methods on the surface modification of UHMWPE fiber were discussed.The interlaminar shearing strength of the composite mate- rial used as reinforced material was measured.The results showed that the gas-phase grafting technology produced better effect than liquid-phase grafting technology in an open oxygen system;the monomer of acrylamide had the grafting effect superior to oth- er monomers;and the graft yield was increased while increasing monomer concentration and grafting time.Using acrylamide as the grafting monomer,expoxy-based composites were prepared via a specific stack sequence method after the graft modification of UHMWPE fiber under 86μW/cm~2 ultraviolet irradiation.The interlaminar shearing strength of the composites was increased to 17.36 MPa from 14.59 MPa.