紫外老化对EVAC/PBO复合材料力学性能的影响  

Effects of Ultraviolet Aging on Mechanical Properties of EVAC/PBO Composites

作　　者：孙宗保 张鹏[1] 朱晓琳[1] 辛建平 宫平[1] 曲志敏[1] 虢忠仁 钟蔚华[1] Sun Zongbao;Zhang Peng;Zhu Xiaolin;Xin Jianping;Gong Ping;Qu Zhimin;Guo Zhongren;Zhong Weihua(Institute 53,China North Industries Group Corporation,Jinan 250031,China)

机构地区：[1]中国兵器工业集团第五三研究所,济南250031

出　　处：《工程塑料应用》2022年第6期111-116,共6页Engineering Plastics Application

基　　金：国家自然科学基金项目(51173089)。

摘　　要：研究紫外光照射时间对乙烯-乙酸乙烯酯(EVAC)/PBO复合材料的力学性能和微观结构的影响,借助电子万能试验机、场发射扫描电子显微镜、傅里叶变换红外光谱仪等设备对复合材料的力学性能及微观结构进行测试表征。结果表明:经过960h的紫外光照射后,EVAC/PBO复合材料的拉伸强度降幅约3.2%,弯曲强度、冲击强度及层间剪切强度下降10%左右,动态力学性能下降并不显著。结合复合材料的微观结构表征可知,在紫外光的照射下,复合材料表面的树脂基体会发生氧化分解,部分纤维裸露出来,在高能紫外光的辐照下纤维内部化学键发生断裂,噁唑环开环,纤维与树脂之间出现明显空隙,界面性能恶化,EVAC/PBO复合材料的界面粘接性能下降,导致整体性能下降。The effects of UV irradiation time on the mechanical properties and microstructure of ethylene-vinyl acetate(EVAC)/PBO fiber composites were studied by using electronic universal testing machine,field emission scanning electron microscopy,Fourier infrared spectrometer and other equipment to test the mechanical properties and microstructure of the composite characterization.The results show that after 960 h UV irradiation,the tensile strength of PBO fiber composites decreases about 3.2%,the bending strength,impact strength and interlaminar shear strength decrease about 10%,and the dynamic mechanical properties of PBO fiber composites do not decrease significantly.Combined with the microstructure of the composite characterization,under the irradiation of ultraviolet light,the resin matrix on the surface of the composite will oxide decomposition.Under the irradiation of high-energy ultraviolet,part of the fiber is exposed,fiber interior chemical bonds break,oxazole ring open.A significant gap between fiber and resin shows with the interface performance deterioration and the degradation of interface adhesive performance of the composite.Thus,the overall performance of EVAC/PBO composite decreases.

关 键 词：乙烯-乙酸乙烯酯/PBO复合材料 紫外光辐照 力学性能 微观结构 

分 类 号：TQ342.73[化学工程—化纤工业]