Effect of PBO Fiber Surface Properties on Tensile Properties of Phenolic Composites
The good interface bonding of composite materials can maximize the load-bearing capacity of the reinforced fiber,and good fiber surface properties can help improve the conversion rate of fiber performance,thus benefiting its mechanical properties.In order to study the effect of the surface properties of domestically produced poly-p-phenylene benzobisoxazole(PBO)fiber on the tensile properties of phenolic matrix composites,the surface properties of three types of domestically produced high-modulus PBO fibers are analyzed by scanning electron mi-croscopy,atomic force microscopy and contact angle measuring instrument,and their fiber strength conversion rates are calculated.It is found that the surface roughness and grooves of PBO fiber have a significant effect on the inter-facial properties and fiber strength conversion of composite materials.The results show that the three kinds of do-mestically produced PBO fibers have obvious adhesion and fiber orientation grooves on the surface,with less surface impurities and more grooves.The PBO-A fiber with the highest surface roughness and surface free energy has the highest strength conversion rate.The strength conversion rate of PBO fiber(40%-50%)is far lower than that of carbon fiber(70%-90%),and its process matching with resin needs to be further improved.
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