【摘要】 采用氩气等离子体结合偶联剂技术对聚对苯撑苯并二噁唑(PBO)纤维进行表面改性,用SEM,XPS和液滴形状法对改性前后纤维表面的形态结构、组成和与水的接触角进行表征,通过单丝拔出试验检测改性前后PBO纤维与环氧树脂基体的界面剪切强度.结果表明,PBO纤维经改性后,其表面亲水性和与环氧树脂的界面剪切强度都有了很大的提高.在偶联剂含量为2%(质量分数),氩气等离子处理条件为2m in,30W和50Pa时,PBO纤维与水的接触角从原丝的大于90°下降到54.5;°相应的界面剪切强度比PBO原丝提高了78%,高达10.44MPa,而且改性后PBO纤维与环氧树脂的界面剪切强度的衰减效应不明显,与水的浸润性也基本不随时间退化.更多还原

【Abstract】 Argon plasma combined with coupling agents was employed to modify the surface of poly[1,4-(pheny-)lene-cis-benzobisoxazole](PBO) fiber.SEM,XPS and droplet profile method were then respectively used to determine the surface morphology,the composition and the contact angle of PBO fibers before and after the treatment.Moreover,the interfacial shearing strengths between PBO fiber and epoxy resin before and after the treatment were finally measured by the single-fiber pull-out test.It is found that the surface hydrophilicity of PBO fiber and the interfacial shearing strength between PBO fiber and epoxy resin are greatly improved after the modification,and that,in the conditions of 2%(mass fraction) of coupling agent,2min of treatment period,30W of power and 50Pa of pressure,the contact angle between the fiber and water reduces from original more than 90° to 54.5°,and the corresponding interfacial shearing strength rises to 10.44MPa,increasing by 78%.Furthermore,both the interfacial shearing strength and the water hydrophilicity of PBO fiber are kept from becoming vestigial after the modification as time progresses.更多还原