牵伸环境对聚丙烯腈原丝取向结构的影响

Effect of drafting environment on orientation structure of polyacrylonitrile precursor

借助于声速仪、X射线衍射仪研究了不同环境下聚丙烯腈(PAN)纤维在牵伸作用下取向结构的变化。结果表明:溶剂、热的单独或协同环境下,牵伸可使PAN纤维的全取向和晶区取向提高,全取向因子的增加幅度大于晶区取向因子的增加幅度;高压水蒸汽环境的牵伸,对PAN纤维取向度影响更加明显;在相同的热处理温度条件下,PAN原丝的取向程度越高,其预氧纤维的预氧化程度越低。

Effect of different drafting environment on orientation structure of polyacrylonitrile precursor was studied by means of X-ray diffraction and sound velocimeter. It showed that in the separate and conjunct environment of solvent and heat treatment,the orientation degree of PAN fibers increased due to drafting. The increase of sonic orientation was bigger than that of crystal orientation. In the environment of high pressure steam, effect of draft on orientation structure was more obvious. Under the same heating conditions,the degree of pre-oxidation decreased with the inerease of orientation degree of PAN fibers.