【摘要】 借助DSC、FTIR、EA、WAXD和热应力变化等表征手段,系统研究了六种聚丙烯腈(PAN)纤维在热稳定化过程中应力变化特征与纤维热化学反应的内在关联。结果表明:在热稳化定化过程中PAN纤维化学应力峰的起始温度和峰顶温度很好地对应了纤维DSC起始与峰顶的温度,因而可采用化学热应力表征PAN纤维环化的反应速率和程度。由于化学应力峰的变化与PAN大分子的组成、有序度、芳构化指数以及密度等特征结构参数的变化具有较紧密对应关系,意味着热应力可用于连续热稳定化过程中在线控制纤维的结构。更多还原

【Abstract】 The relationships between the thermal stress changes and the thermo-chemical reaction of six diffe-rent PAN fibers during oxidative stabilization were studied using DSC,FTIR,EA,WAXD,and thermal stress(analysis).Results show that the temperature for which a thermal stress begins and the temperature at which it reaches a maximum correlate well with exothermal start and peak temperatures from DSC.This indicates that the changes in thermochemical stress can be also used to characterize the speed and extent of the cyclization reaction of the PAN fibers.The changes in the thermal stress peaks can also be correlated with the changes in fiber structure,such as composition,element content,degree of domain orientation,aromatization index and density,implying that thermo-stress can be used control the fiber structure online during a continuous thermal stabilization process.更多还原