PAN原丝预氧化工艺与氧元素含量相关性研究

利用差热、热重以及元素分析等测试手段测定了预氧化纤维中氧含量,分析了纤维的吸水性对氧含量测定结果的影响,讨论了预氧化温度、走丝速度及牵伸倍数与氧含量的关系,研究了预氧丝氧含量与碳纤维拉伸强度之间的关系.实验结果表明:不同预氧化纤维的吸水性对氧含量的测定结果有不同的影响;氧含量随温度的升高而增加,且温度越高,增加幅度越大;走丝速率越慢,相同温度下氧含量越高;预氧化低温牵伸有利于氧元素的扩散;可以从氧含量接近或处于10%～12%范围的预氧丝中制得较高强度的碳纤维,否则很难制得好的碳纤维.

Correlation between Pre-Oxidation Processing and Oxygen Content of PAN-Based Oxidized Fibers

The content of oxygen element in preoxidized fibre(OF) can be regarded as the characterization of pre-oxidation extent.The differential thermal analysis,thermalgravimetric analysis and elemental analysis are used to determine the content of oxygen element in preoxidized fibre,analyze how the water asorptivity effects the determination of the oxygen element content,discuss the relationship between temperature,running speed,drawing and the oxygen element content.The results show that the effect of water asorptivity on the determination of the oxygen element content in PAN precursor is stronger than that in preoxidized fibre;The oxygen element content increases when temperature increases and more temperature,more increment;The oxygen element content is higher when the running speed is slower at the same temperature; The drawing is good for the oxygen diffuseness in OFs;Those OFs which oxygen content lies near or between 10-12% may produce good CFs otherwise it can't do.