预炭化温度对聚丙烯腈基活性碳纤维结构与力学性能影响初探

The effect of pre-carbonization temperature on the structure and mechanical properties of polyacrylonitrile( PAN)-based activated carbon fibers

采用连续化碳纤维实验装置制备活性碳纤维,借助广角X射线衍射(WAXD)、元素分析(EA)、比表面积(BET)、力学性能及碘吸附等表征测试手段研究了预炭化温度对聚丙烯腈基活性碳纤维(PAN-ACFs)结构与力学性能的影响。结果表明:PAN-ACFs的N元素质量分数、孔结构、晶粒尺寸是影响PAN-ACFs力学性能的重要因素,且随着预炭化温度的升高均呈现先减小后增大的趋势;当预炭化温度为680℃时,所制备的PAN-ACFs吸附性能较好,力学性能较佳,此时晶粒尺寸La为1.08nm,N元素质量分数5.7%,平均孔径0.81nm。

Polyacrylonitrile-based carbon fibers(PAN-ACFs) have been prepared on a continuous carbon fiber production line.The effects of pre-carbonization temperature on the structure and mechanical properties of PAN-ACFs were studied by wide angle X-ray diffraction(WAXD),elemental analysis(EA),specific surface area(BET)measurements,and by measuring their mechanical properties and iodine adsorption.The results showed that the N quality score,average pore size,and crystallite size of PAN-ACFs are all important factors affecting the mechanical properties of PAN-ACFs,and the values of these parameters all first increased and then decreased with increasing pre-carbonization temperature.When the pre-carbonization temperature was 680 ℃,the resulting PAN-ACFs had good adsorption properties,good mechanical properties,a grain size(La) of 1.08nm,N quality score of 5.7%,and average pore size of 0.81nm.