中文摘要：

以H2O2为湿化学处理液,利用扫描电镜、热重分析仪、纤维检测系统、单纤维电子强力仪、傅里叶变换红外光谱仪、X射线光电子能谱仪、X射线粉末衍射仪分别研究了H2O2氧化对干法纺聚酰亚胺纤维浸润性能、微观形貌、热失重性能、直径及力学性能、化学结构、表面元素含量和微观聚集态结构的影响。结果表明,H2O2氧化后,纤维表面凹凸不平,比表面积及粗糙度增加,局部发生刻蚀,引入了活性基团,表面能提高,O/C比值增加,浸润性能得到改善,且随着H2O2浓度或温度提高、处理时间延长,浸润性能改善趋势加快,热失重性能保持较好,直径及力学性能略微下降。表面氧化使纤维化学结构变化不大,微观聚集态结构发生改变,非结晶区比例上升,采用适当的H2O2处理工艺,有助于聚酰亚胺纤维表面进行功能化改性。

英文摘要：

H2O2 served as wet chemical treatment fluid, was used for dry-spinning polyimide fibers and the impact of H2O2 oxidation on wetting properties, surface morphology, thermogravimetric properties, diameter and mechanical properties, chemical structure, content of the surface element and microscopic state of aggregation structure of fibers was analyzed by SEM, TG, fiber detection system, single fiber electronic strength meter, FT-IR, XRD and XPS. The results indicate that after H2O2 oxidation, fibers surface becomes uneven, roughness increases, the surface energy and O/C ratio increase, the wetting properties are enhanced; moreover, with the higher H2O2 concentration or the increase of temperature and processing time, wetting properties improve sharply, thermogravimetric properties keep preferably, the diameter and mechanical properties degrade slightly. The surface oxidation does not change the chemical structure of fibers significantly, the microscopic state of aggregation structure change, the amorphous region content rises. Taken together, the functional modification of PI fiber surface can be efficiently achieved by employing a suitable H2O2 oxidation process.