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研究了聚对苯撑苯并双口恶唑(PBO)和芳纶(F-12)2种纤维的结构、性能及其单向复合材料的性能。电子扫描电镜照片微观结构的研究表明,PBO纤维与F-12纤维相比较,其分子取向更高,表面更光滑,因而与树脂基体的粘接力较差;而F-12纤维因为分子表面不均匀,有微小的浅沟槽,与树脂基体的接触表面积较大,因而粘接力强。复合材料性能的研究表明,PBO纤维的单向复合材料比F-12芳纶纤维的具有更好的拉伸性能,其中拉伸强度高约34.7%,拉伸模量高约63.8%。但其层间剪切强度却很低,只有24.3 MPa。
The structure, properties and unidirectional composites properties of two kinds of fibers, poly (p-phenylene-benzobisoxazole (PBO) and aramid fiber (F-12) The SEM micrographs showed that compared with F-12 fibers, PBO fibers had higher molecular orientation and smoother surface, which resulted in poorer bonding with resin matrix. However, F-12 fibers did not have the same molecular surface Even, with a slight shallow groove, the contact surface area with the resin matrix larger, and thus strong adhesion. The research on the properties of composite materials shows that PBO fiber has better tensile properties than F-12 aramid fiber, the tensile strength is about 34.7% and the tensile modulus is about 63.8%. However, the interlaminar shear strength is very low, only 24.3 MPa.