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采用γ-射线辐照方法对在氮气介质中的聚丙烯腈纤维进行处理,探索辐照剂量对纤维单丝拉伸强度和复合材料界面性能的影响。研究结果表明:在辐照剂量10~1000kGy范围内,随着辐照剂量的增加纤维单丝拉伸强度逐渐降低,同时辐照使得复合材料的层间剪切强度降低。进而采用原子力显微镜(AFM)对纤维表面形貌进行观察,用红外光谱(FT-IR)表征纤维表面化学结构,用X射线衍射(XRD)分析结晶状态,用差示扫描量热仪(DSC)测定纤维的耐热性能。
The γ-ray irradiation method was used to treat polyacrylonitrile fibers in nitrogen medium to explore the effect of irradiation dose on the tensile strength of monofilament and the interfacial properties of the composites. The results show that the tensile strength of the monofilament decreases gradually with the irradiation dose increasing from 10 to 1000kGy, and the interlaminar shear strength decreases with irradiation. The surface morphology of the fiber was observed by atomic force microscope (AFM). The chemical structure of the fiber surface was characterized by FT-IR. The crystallization state was analyzed by X-ray diffraction (XRD) Determination of fiber heat resistance.