摘要
通过光密度法研究了预氧化过程中温度和时间对聚丙烯腈(PAN)基预氧化纤维皮芯结构形成和演变的影响,发现在恒定温度下对纤维进行预氧化时,250℃是纤维皮芯结构产生的温度分界点;且皮芯结构的产生具有明显的时间依赖性。同时,也跟踪了预氧化过程中纤维的氧含量变化。当预氧化温度提高后,纤维预氧化过程由反应控制转变为氧扩散控制。为了制备结构均匀的预氧化纤维,在控制纤维氧含量的同时,也应控制皮芯结构的形成。
The influence of temperature and time on the formation and evolvement of skin-core structure of polyacrylonitrile （PAN）-based oxidized fiber in thermal stabilization process has been studied by optical densitometric analysis. 250℃ was the critical temperature for skin-core structure formation in constanttemperature heat treatment. Besides, the formation of skin-core structure was time-dependant. Oxygen content of the PAN fiber in the thermal treatment process has also been monitored. When the heat treatment temperature increased, the stabilization process turned from reaction limited to oxygen diffusion controlled. In order to produce stabilized fiber with uniform structure, oxygen content and skin-core structure of the fiber were controlled.
出处
《合成纤维》
CAS
2011年第8期1-4,共4页
Synthetic Fiber in China
基金
国家重点基础研究发展计划(2011CB605602)资助项目
关键词
聚丙烯腈纤维
预氧化
皮芯结构
光密度法
氧含量
polyacrylonitrile fiber, pre-oxidation, skin-core structure, optical densitometric analysis,oxygencontent
