碳纤维表面氧化还原研究

Oxidation and Reduction on the surface of Carbon Fiber

利用空气氧化碳纤维（ＣＦ），研究硼氢化钠（ＮａＢＨ４）和四氢铝锂（ＬｉＡｌＨ４）对氧化碳纤维的还原作用． 借助傅立叶红外光谱、Ｘ光光电子能谱，研究碳纤维表面氧化、还原后官能团的变化． 结果表明：氧化可使ＣＦ表面的≡Ｃ—Ｈ部分转化为含氧基团，而ＮａＢＨ４ 的还原可使ＣＦ表面官能团＝ Ｃ＝ Ｏ部分转化为—ＯＨ，ＬｉＩＨ４ 还原可使ＣＦ表面官能团—ＣＯ—，—ＣＯＯ—部分转化为—ＯＨ．从而获得表面官能团—ＯＨ含量较高的碳纤维，可望为其复合材料界面化学研究提供一种方法．同时，提出了ＣＦ表面氧化、还原的机理．

Carbon fiber (CF)is oxidized by air,and the reduction of oxidized CF is studied by sodium borohydride (NaBH 4) and lithium aluminium tetrahydride (LiAlH 4).With the help of Fourier IR spectrum and X ray photoelectron spectroscopy,the authors study the change of functional groups on the surface of CF after oxidation and reduction.As shown by the results,≡C—H on the surface of CF can be partly transformed onto oxygen containing group by oxidation;the functional group =C=O on the surface of CF can be partly transformed into —OH by NaBH 4 reduction;the functional groups —CO—,—COO— on the surface of CF can be partly transformed into —OH by LiAlH 4 reduction.Thus a carbon fiber with a higher surface functional groups —OH content can be obtained;and a method can be expected to be proposed for studying surface chemistry of its composite material;and the mechanism of oxidation and reduction on the surface of carbon fiber can be explained.