短碳纤维对CF/TiO_2复合载体材料性能的影响  

Effect of short carbon fiber on the property of CF/titania composite support

作　　者：居增南 王继元[2] 林陵[1] 曾崇余[1] 

机构地区：[1]南京工业大学化学化工学院,南京210009 [2]中国石化扬子石油化工有限公司研究院,南京210048

出　　处：《化工新型材料》2015年第4期96-98,101,共4页New Chemical Materials

基　　金：中国石化扬子石油化工有限公司资助项目(12GKJ005)

摘　　要：以短碳纤维(CF)为增强体,利用硝酸和空气氧化法对短碳纤维进行表面处理,采用挤出成型法制备短碳纤维增强的CF/TiO2复合载体材料。考察了处理前后碳纤维表面性质的变化以及碳纤维添加量对TiO2载体性能的影响,并采用扫描电镜(SEM)、傅里叶红外光谱(FT-IR)、比表面积(BET)等手段对碳纤维和CF/TiO2复合载体进行了表征。结果表明,碳纤维经硝酸和空气氧化处理后,表面更加粗糙、轴向沟槽明显增多加深;600℃氮气气氛焙烧后,随碳纤维含量的增加,CF/TiO2复合载体的抗压强度先增大后降低,硝酸处理碳纤维用量为5%时,复合载体的抗压强度最高可达237.5N/cm,较之空气处理及未处理的复合载体分别提高了10.9%和48.5%,增强效果最为理想;并且硝酸处理碳纤维的引入不会对CF/TiO2复合载体的比表面积和孔结构产生不良影响。Short carbon fibers（CF）were treated by air oxidation and nitric acid oxidation, respectively. Thereafter the treated and the untreated fibers were doped into titanium dioxide matrix to form carbon fiber-reinforced titania（CF/ TiO2 ）composites with different CF contents by extrusion molding method. Effects of CF content on the properties of CF/ TiOz composites were investigated, and the carbon fibers and CF/TiOz composites were measured by SEM, FT IR and BET methods. The results showed that carbon fiber surface modification by oxidation can deepen axial grooves and enlarge spe- cific surface area as well as its roughness. With increasing fiber content, the compressive strength of composites calcined at 600℃ under nitrogen atmosphere increased firstly and then decreased. The maximum value（237.5 N/cm）at 5 % content of carbon fiber treated by nitric acid was achieved, which was increased by 10.9 % and 48.5 %, respectively, than those corn posites treated by air oxidation and without oxidation. It was also found that introduction of carbon fibers didn＇t had unfa- vorable effect on the surface area and pore size distribution of composites.

关 键 词：短碳纤维 表面改性 二氧化钛 复合载体 抗压强度 

分 类 号：TQ342.742[化学工程—化纤工业]