热处理温度对对位芳纶纤维表面聚集态结构和性能影响  

Effects of Heat Treatment Temperature on Surface Aggregation Structure and Properties of Para-Aramid Fibers

作　　者：周琴 李杨[3] 林昆杰 刘金勇 郝智[1] 罗筑[1] Zhou Qin;Li Yang;Lin Kunjie;Liu Jinyong;Hao Zhi;Luo Zhu(College of Material and Metallurgy,Guizhou University,Guiyang 550001,China;Engineering Training Center,Guizhou Institute of Technology,Guiyang 550003,China;School of Materials and Energy Engineering,Guizhou Institute of Technology,Guiyang 550003,China)

机构地区：[1]贵州大学材料与冶金学院,贵阳550001 [2]贵州理工学院工程训练中心,贵阳550003 [3]贵州理工学院材料与能源工程学院,贵阳550003

出　　处：《工程塑料应用》2021年第2期117-122,135,共7页Engineering Plastics Application

基　　金：贵州省科技厅基金项目(黔科合基础[2019]1134号);大飞机短舱用阻燃耐火有机硅橡胶关键技术研发(黔科合支撑[2019]2030号);贵州理工学院创新创业项目(201914440347,201914440192)。

摘　　要：以不同温度(200,250,300,350℃)热处理对位芳纶纤维,用傅立叶变换红外光谱(FTIR)、拉曼光谱(Raman)、X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)分析了氧化热处理对对位芳纶纤维表面基团和聚集态结构的影响。FTIR和XRD分析结果表明,经250℃及以上热处理,纤维表层分子链重排,氢键增强。Raman和XPS分析结果表明,经250℃及以上热处理后,对位芳纶纤维表层分子链苯环上C(C—C,C=C或C—H)被氧化成—C—OH或—COOH,纤维表面极性增加。经300℃热处理后,对位芳纶纤维表层分子链运动、重排并开始收缩,结晶度增加,纤维单丝的拉伸强度达到25.7 cN/dtex,提升了4.9%。经250℃热处理后,对位芳纶纤维与环氧树脂微滴的界面剪切强度达到18.05 MPa,与未热处理时相比增加了11.9%。The para-aramid fibers were heat treated at the different temperatures(200,250,300,350℃),the effects of heat treatment on the surface group and the aggregate structure of para-aramid fibers were investigated by Fourier transform infrared spectroscopy(FTIR),Raman spectroscopy,X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS)and scanning electron microscope(SEM).The results of FTIR and XRD analysis show that the molecular chains in the surface layer of the fibers were rearranged and the hydrogen bonds were enhanced when the temperature is greater than or equal to 250℃.The results of Raman and XPS analysis show that C(C—C,C=C or C—H)on the surface molecular chain of p-aramid fibers are oxidized to be—C—OH or—COOH at 250℃or above,and the surface polarity of the fibers increases.After heat treatment at 300℃,the molecular chains on the surface of para-aramid fibers move,rearrange and began to shrink,the crystallinity increases,and the tensile strength of the single fiber reaches 25.7 cN/dtex,which increases by 4.9%.After heat treatment at 250℃,the interfacial shear strength of paraaramid fiber and epoxy drop reaches 18.05 MPa,which increases by 11.9%compared with the untreated fiber.

关 键 词：对位芳纶纤维 热处理 聚集态结构 力学性能 

分 类 号：TQ342.72[化学工程—化纤工业]