Interfacial properties of phosphorous acid modif iedKevlar f iber reinforced epoxy resin composites
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摘要: 采取不同浓度的磷酸水溶液对芳纶纤维进行表面处理, 并对不同处理条件下芳纶纤维的单丝强度、表面性质及其环氧树脂复合材料的界面性能进行了分析和测试。结果表明: 20 wt %磷酸溶液处理的芳纶纤维, 纤维表面含氧官能团含量最高; 继续提高磷酸溶液的浓度, 含氧官能团含量下降, 纤维表面趋于平整, 单丝强度上升。用20 wt %磷酸溶液处理芳纶纤维, 纤维/ 环氧树脂基复合材料的层间剪切强度达到62 MPa , 界面剪切强度提高18 % , 是一种简单有效的表面处理方法。纤维表面粗糙度和纤维表面含氧官能团的数量是影响芳纶纤维/ 环氧树脂复合材料界面结合性能的关键因素。Abstract: The Kevlar fibers were t reated by phosphorous acid ( PA) solutions of different concent rations. Thesurface properties of the t reated Kevlar fiber and the interfacial properties of the fiber/ epoxy resin composites wereinvestigated. The result s show that the amount of the oxygenous functional groups on the surface reaches a maximum af ter being t reated with 20 wt % PA solution. The amount of the oxygenous functional groups and the surfaceroughness decrease as the concent ration of PA solution increases , but the filament st rength rises. Af ter beingt reated with 20 wt % PA solution , the interlaminar shear st rength ( ILSS) of Kevlar fiber/ epoxy composites reaches62 MPa and the interfacial shear st rength ( IFSS) of Kevlar fiber/ epoxy composites increases by 18 %. The amount ofthe functional groups on the fiber surface and the surface roughness are the crucial factors to improve interfacialproperties of Kevlar fiber/ epoxy composites .
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Keywords:
- Kevlar fiber /
- surface t reatment /
- ILSS /
- IFSS /
- resin mat rix composites
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