紫外辐照对芳纶纤维结构与性能的影响  

Effects of ultraviolet irradiation on the structure and properties of aramid fibers

作　　者：李志尧 严坤 王雯雯[1] 赵青华[1] 王栋[1] 杨晨光 LI Zhiyao;YAN Kun;WANG Wenwen;ZHAO Qinghua;WANG Dong;YANG Chenguang(Key Laboratory of Textile Fiber and Products,Ministry of Education,Wuhan Textile University,Wuhan 430200,China)

机构地区：[1]武汉纺织大学纺织纤维及制品教育部重点实验室,武汉430200

出　　处：《辐射研究与辐射工艺学报》2024年第3期29-36,共8页Journal of Radiation Research and Radiation Processing

基　　金：国家自然科学基金(12205225、52373063)资助。

摘　　要：在空气中对芳纶纤维进行紫外辐照,研究紫外辐照对芳纶纤维结构变化、热稳定性能、结晶性能、表面微观形貌以及拉伸性能的影响。采用傅里叶变换红外光谱仪(FTIR)、热重分析仪(TG)表征分析了芳纶纤维紫外辐照前后化学结构、热稳定性的变化。采用扫描电子显微镜(SEM)、原子力显微镜(AFM)和X射线广角衍射仪(XRD)分别观察芳纶纤维紫外辐照前后的表面形貌和晶体结构转变。最后采用单丝强力仪等对样品力学性能进行表征。FTIR结果表明,经过紫外辐照后纤维表面出现新的含氧化合物。SEM和AFM观察结果显示,紫外辐照后纤维表面变得粗糙,并出现沟壑,且随辐照时间增加,粗糙度增加。XRD结果表明,紫外辐照对芳纶纤维晶体结构影响较小。拉伸性能结构显示随着紫外辐照时间的增加,芳纶纤维的单丝抗拉强度出现下降。芳纶纤维经紫外辐照后,表面化学活性提高,粗糙度增加,这将有效改善芳纶纤维与复合基体之间的界面黏合性,增强界面作用力,这对于解决高性能纤维自身难以编织以及复合强度不佳的瓶颈问题具有重要意义,为进一步拓宽芳纶纤维在高防护服饰、防护鞋面等需要增强界面黏合的复合材料领域方面的应用提供参考。The effects of UV irradiation on the chemical structure,thermal stability,surface morphology,and mechanical properties of aramid fibers were systematically studied.Changes in the chemical structure and thermal stability of the aramid fibers were characterized using Fourier transform infrared(FTIR)spectroscopy and thermogravimetric analysis,respectively.Scanning electron microscopy(SEM),atomic force microscopy(AFM),and X-ray wide-angle diffractometry(XRD)were employed to observe the surface morphology and crystal structure transformation of the aramid fibers before and after UV irradiation,respectively.Finally,the mechanical properties of the fibers were characterized using a monofilament strength testing machine.The FTIR results showed that the aramid fiber surfaces were photodegraded after UV irradiation,and new oxygen-containing functional groups appeared.The SEM and AFM results revealed that the surfaces became rough and gullied after ultraviolet irradiation.XRD results showed that UV irradiation had little effect on the crystal structure of the aramid fibers.Finally,the tensile properties indicated that the tensile strength decreased with increasing irradiation time.Based on these results,the surface chemical activity and roughness of the aramid fibers were increased after UV irradiation,which improved the interface adhesion between the aramid fibers and composite matrix while enhancing the interface force.Thus,solving the bottleneck problem of high-performance fibers,which are difficult to weave and exhibit poor composite strengths,is important.This study provides a reference for further expanding the application of aramid fibers in the field of composite materials.These applications include high-protective clothing and protective upperwear,which require enhanced interface adhesion.

关 键 词：对位芳纶 紫外辐照 力学性能 表面形貌 晶体结构 

分 类 号：TL13[核科学技术—核能科学]