摘要
作者采用经典化学分析法、x射线光电子能谱分析法,研究了碳纤维经氧冷等离子体处理前后表面酸性基团的变化。化学分析结果表明,碳纤维表面酸性基团增加了3.4倍;x射线光电子能谱分析结果表明,碳纤维表面O/C原子比提高1倍,冷等离子体处理条件如处理时间、气体流量、压力及输出功率等对碳纤维表面酸性基团的变化有重大的影响。根据分析结果,还探讨了氧冷等离子体氧化碳纤维表面的反应机理及其表面化学结构的变化规律。作者认为,碳纤维表面处理所产生的酸性基团,是提高碳纤维增强树脂复合材料的层间剪切强度的一个重要因素。
The effect of a variety of conditions(e. g. discharge time, gas flow rate, vacuum and power) of R. F. cold plasma treatments on carbon fiber surfaces has been examined by using chemical quantitative analysis and x-ray photoelectron spectroscopy. The concentration of the acidic groups ( i. e. —COOH, intramolecular —C=OOR and R—OH) on the surface with carbon fiber oxidized by O_Z cold plasma rises from 0.0232 mmol/g to 0.1025 mmol/g, the O/C on the CF surface is also increased by 100%. It can be concluded that the acidic functional groups(particularly—COOH and R— OH )on the CF surface is mainly responsible for the increase of ILSS of its composite (CFRP) after the CF surface is treated by cold plasma.
关键词
碳纤维
冷等离子体
表面基团
carbon fiber
cold plasma
surface treatment
surface groups
