碳纤维的硝酸氧化及表面化学分析

Nitric Acid Oxidation of Carbon Fiber and its Surface Chemistry Analysis

采用 X光电子能谱 (XPS)及化学衍生法探讨了硝酸氧化前后的碳纤维表面化学的变化。研究表明 ,高模量碳纤维的表面化学基团含量要比低模量碳纤维的低。硝酸氧化对低模量碳纤维的表面改性远比高模量碳纤维的大。硝酸氧化减少了碳纤维表面的羟基含量 ,同时增加了碳纤维表面的羧基含量。

The surface chemistry of a high modulus and a low modulus carbon fiber, both before and after nitric acid oxidation, were studied by X-ray photoelectron spectroscopy (XPS) and chemical derivatization. It has shown that on untreated fiber surfaces, the high modulus fiber has much less functional groups than the low modulus fiber. Nitric acid has much more surface chemistry effects on the low modulus carbon fiber than high modulus one. Nitric acid oxidation was found to reduce the surface hydroxyl (OH) groups in increasing the carboxylic acid (COOH) groups.