摘要
主要采用电化学氧化法对聚丙烯腈 (PAN)基碳纤维进行连续氧化处理 ,利用扫描电子显微镜 (SEM )、X射线光电子能谱 (XPS)和动态力学热分析 (DMTA)对碳纤维表面处理效果进行了研究。SEM表面形貌研究结果表明 ,碳纤维经电化学氧化处理后 ,其表面的粗糙度和比表面积增大。XPS表面化学分析表明 ,经电化学氧化处理后的碳纤维表面羟基含量提高 5 5 % ,活性碳原子数增加 1 8%。DMTA谱图表明经电化学氧化处理的碳纤维增强树脂基复合材料 (CFRP)其玻璃化温度 (Tg)提高 5℃、损耗角正切 (tanδ)较未处理的降低 30 %。定量计算出的界面黏结参数A和α与CFRP的层间剪切强度 (ILSS)所反映的碳纤维与树脂间界面黏结效果是一致的。研究结果表明 ,采用适当的处理条件可使CFRP的ILSS提高 2 0 %以上。
By use of electrochemical oxidation method, polyacrylonitrile (PAN)-based carbon fibers were treated continuously. Scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and dynamic mechanical thermal analysis (DMTA) were used to study the surface of PAN-based carbon fiber (CF) treated by electrochemical oxidation. The micrographs of SEM display the roughness and specific surface area of carbon fibers increase after being treated. XPS analysis indicates that hydroxyl group content and active carbon atom of the treated CF are higher than those of untreated CF i.e.,They are improved to 55% and 18% respectively. The results in DMTA chart show that loss tangent (tan δ ) of treated carbon fibers reinforced epoxy declines to 30% than untreated, and the glass transition temperature ( T g) also increases by 5?℃.Quantitative analysis's results reveal that the interfacial adhesion parameter A and α can reflect the interfacial bonding effect between carbon fibers and epoxy, which are compatible with what are reflected by ILSS value of CFRP. In conclusion, appropriate oxidative conditions can make interlaminar shear strength (ILSS) increased over 20%.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2004年第3期282-285,共4页
Chemical Industry and Engineering Progress
基金
国家自然科学基金项目 (No 5 0 172 0 0 4
5 0 3 3 3 0 70 )资助
