【摘要】 对去胶聚丙烯腈炭纤维(PAN-CF)分别进行不同时间的硝酸液相氧化处理,采用N2等温(77.35 K)吸附及SEM观察的方法,分析氧化处理对纤维表面结构的影响。研究结果表明:氧化处理会使纤维表面产生大量的孔洞,增加BET比表面积和BJH累积孔体积,提高表面吸附能力;在氧化初期,伴随着纤维表面大量活化点的迅速氧化,纤维表面微孔、中孔数量、表面粗糙度、比表面积和累积孔体积迅速增加,使纤维表面吸附能力大大增强,但在氧化5 min以后,由于纤维表面尖锐突起处发生氧化,从而减少了纤维表面微孔,比表面积和累积孔体积降低,表面吸附能力减弱。更多还原

【Abstract】 PAN carbon fibers(PAN-CF) without adhesion agent were treated with nitric acid for different time.By means of scanning electron microscopy(SEM) and isotherm absorption of N2 at 77.35 K,the effects of nitric acid liquid phase oxidation treatments on the surface structure of carbon fiber(CF) were investigated.The results show that these treatments lead to many micro-pores and increase BET surface area(TSA) and BJH cumulative adsorption pore volume(BPV).Surface absorption capability is also improved.At the first stage of oxidation treatments,lots of activation points are oxidized.In addition,the quantity of micro-pore and meso-pore,roughness,TSA and BPV increase rapidly,which enhances the surface absorption capability of CF efficiently.However,during the successive oxidation procedures,the parameters above decrease due to the oxidation of acute points.更多还原