研究了氧化-偶联改性处理对碳纤维的表面形貌、电荷特性、分散性和成纸导电性的影响,并考察了碳纤维配比、碳纤维长度和炭黑加填对碳纸的透气性和孔径分布的影响.结果表明,KClO3/H2 SO4预氧化处理对纤维表面产生了刻蚀作用,在结晶缺陷部位产生凹坑,形成轴向沟槽.KH-550偶联剂以微粒形态粘附于沟槽中,碳纤维浆料的zeta绝对值明显增加,碳纤维间的静电斥力加强,分散性得到改善,碳纸的导电性也得到提高.碳纤维长度和炭黑加填能有效调节碳纸的透气性和孔径分布.
The effects of oxidation-coupling modification on carbon fiber(CF)were investigated according surface morphology,charge characteristics,dispersion and the conductivity of paper.At the same time,the permeabili-ty and pore size distribution of carbon paper were discussed by the ratio of CF,CF length and the loading of car-bon black.The pre-oxidation treatment of KClO3-H2 SO4 produces an etching effect on the fiber surface,gener-ates potholes in crystal defect parts,and forms axial grooves.Coupling agent KH-550 attaches on the groove in particulate,the obvious increase of absolute value of zeta was observed,electrostatic repulsion between the CFs was strengthened,the dispersion of CFs was improved,and the electrical conductivity of the carbon paper had also been improved.The length of CF and the loading of carbon black can effectively adj ust the permeability and pore size distribution of carbon paper.
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