摘要
用气—固色谱法(反气相色谱法)研究了表面处理对碳纤维表面性质的影响。通过观察被测碳纤维表面与正烷烃及极性有机液体探针的相互作用,测定在“零复盖”条件下淋洗过程的保留体积,计算了吸附热力学函数。结果表明,经苯乙烯—马来酸酐共聚物电沉积处理的碳纤维表面与未处理碳纤维相比,表面能的色散分量差别不大。烷烃蒸汽在处理过的碳纤维表面上吸附时有较大的熵变,这表明烷烃分子在这种表面上吸附后构象变化更大,即探针分子活动性降低的程度比未处理表面来得大。极性探针与两种碳纤维表面的相互作用有很明显的差别,处理后的碳纤维表面与电子给体探针有强的相互作用,表明共聚物电沉积使碳纤维表面增加了电子受体基因,因而能有效地改善碳纤维表面与复合材料基体树脂的粘合性能。
Gas-solid chromatography (invers gas chromatography) was used to study the surfaces of copolymer-electrodgposited and untreated carbon fibers. By adopting a scries of n-alkanes and 'polar' liquids as molecular probes, the retention volumes on the surfaces of carbon fiber samples were measured under the case of 'zero coverage' .From the dependence of elution retention on the temperature as well as the vapor pressure of the adsorbates the difference of the surface characteristic between deposition treated and untreated carbon fiders was revealed.It is shown that the enthalpy and entropy increment r suited by adsorpting per-CH2-segment of n-alkancs on the copolymor-deposited surface is much higher than on the untreated one.Besides, the tr ated carbon fiber displays strong interaction with electron-donor prcbes, on the contrary, the untreated surface has no affinity for all of the used probds.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
1990年第1期7-14,共8页
Acta Materiae Compositae Sinica
