聚丙烯腈纤维热物理收缩行为的研究

Thermophysical shrinkage behavior of polyacrylonitrile precursor

利用动态力学分析、热机械分析以及X射线衍射分析等方法对聚丙烯腈(PAN)纤维在不同拉伸条件下的热物理收缩行为进行了研究。结果表明:拉伸有利于PAN纤维非晶区的取向,在热环境条件下,随着分子链运动活性的提高而生产解取向;拉伸倍数越大,PAN纤维解取向越容易发生,物理收缩量越大;沸水处理后,PAN纤维的物理收缩量随拉伸倍数的增加而减小,纤维晶态结构完善,非晶区相对含量减少。

The therm ophysical shrinkage behavior of polyacrylonitrile （PAN） precursor was studied under different drawing conditions by dynamic mechanical analysis, thermal mechanical analysis and X-ray diffraction. The results showed that the stretc- hing was bendeficial to the orientation of the molecular chains in amorphous region; the disorientation of PAN precursor oeeured while the motion of molecular chains became more active under thermal environment; the disorientation was easier to occur and the physical shrinkage was greater when the stretch ratio was higher; PAN precursor had perfect crystalline structure and less relative content of amorphous region and the physical shrinkage of PAN precursor was decreased with the increase of draw ratio after boiling water treatment.