芳纶APMOC的热老化

Thermal Ageing of APMOC

采用高温干燥箱在100℃、120℃、150℃条件下研究了热老化对阿莫斯(APMOC)结构与性能的影响,并对老化试样进行了单丝拉伸测试及相应的结构分析。实验表明,在实验温度范围内,APMOC不存在明显分子结构的变化;在100℃,120℃处理条件下,由于结晶度的增加,纤维性能有轻微上升,而150℃处理使力学性能下降,且强度变化比模量变化明显;热老化对纤维性能影响的总体趋势是使其脆化,伸长率下降,通过老化前后拉伸断口的扫描电镜(SEM)观察结合纤维自身皮芯结构的特点,解释了老化前后纤维失效形式从原纤劈裂到脆性断裂的微观机理。

In order to investigate the influence of thermal ageing on structure and property of APMOG, thermal ageing was carried out at 100 ℃, 120 ℃ and 150℃ by means of high temperature drier. Single filament tensile testing and relevant structure analysis was implemented after ageing . The results show： there＇s nearly no molecular structure change within the experimental temperature; while tensile property increases a little after ageing at 100 ℃ and 120 ℃ due to increase of crystallinity; at 150℃, mechanical property degrades and strength degrades more than module; the overall trend of thermal ageing is to embrittle the fibre and make its elongation decrease; combined failure fracture observed by scanniflg electron microscope （SEM） with fibre＇ s self skin-core structure character, microscopic mechanism of fibre＇s failure goes from ＇fibrillation＇ to brittle rupture was interpreted.