预氧化程度对聚丙烯腈预氧化纤维结构与性能的影响  

Effect of pre-oxidation degree on structure and properties of polyacrylonitrile thermal oxidative stabilized fiber

作　　者：王俊 葛媛 曹安然 张守雷 严泽同 WANG Jun;GE Yuan;CAO Anran;ZHANG Shoulei;YAN Zetong(School of Materials Science and Engineering,Jilin Jianzhu University,Changchun 130118,China)

机构地区：[1]吉林建筑大学材料科学与工程学院,长春130118

出　　处：《中国塑料》2024年第11期53-56,共4页China Plastics

基　　金：吉林省科技发展计划项目资助(YDZJ202301ZYTS282)。

摘　　要：通过在空气气氛下恒定牵伸PAN纤维,制备具有不同预氧化程度的预氧化纤维(基于傅里叶变换红外光谱用相对环化率表征预氧化程度),探究预氧化程度对预氧化纤维的化学结构、晶体结构、微观结构和力学性能的影响。结果表明,预氧化程度高于54.7%时,共轭羰基出现且含量逐渐增大;预氧化程度为83.2%时,纤维形成新的漫散射峰和序态结构,纤维横截面具有明显的径向不均匀结构现象,断裂伸长率较小;预氧化程度约为72.0%时,可以获得结构缺陷少,力学性能较为良好的预氧化纤维。Thermal oxidative stabilized(TOS)fibers with different pre-oxidation degrees were prepared by using constant draft polyacrylonitrile(PAN)fibers under air atmosphere according to the pre-oxidation degree obtained from the relative cyclization rate determined by Fourier-transform infrared spectroscopy.The effect of pre-oxidation degree on the chemical and crystal structures,microstructure,and mechanical properties of the resultant TOS fibers were investigated.The results indicated that the conjugated carbonyl groups began to form at a pre-oxidation degree greater than 54.7% and tended to increase gradually.The TOS fibers exhibited new diffuse peaks and ordered structures at a pre-oxidation degree of 83.2%,and their cross section presented an obvious radial non-uniform structure,so-called“skin-core structure”along with a decrease in the elongation at break.Therefore,the TOS fibers obtained a cyclization degree of 72%,thus resulting in fewer structural defects and better performance.

关 键 词：聚丙烯腈 预氧化程度 皮芯结构 力学性能 

分 类 号：TQ325[化学工程—合成树脂塑料工业]