硅溶胶改性碳纤维对碳纤维/环氧树脂复合材料界面性能影响  

Effect of surface modification by silica sol on interfacial properties of carbon fiber/epoxy composite

作　　者：岑浩[1] 杨洪斌[1] 傅雅琴[1] 

机构地区：[1]浙江理工大学先进纺织材料与制备技术教育部重点实验室,杭州310018

出　　处：《复合材料学报》2012年第6期32-36,共5页Acta Materiae Compositae Sinica

基　　金：浙江省自然科学基金项目(Y4100213)

摘　　要：以硅烷偶联剂和正硅酸乙酯(TEOS)为前躯体,以固体酸-对甲苯磺酸为催化剂制备硅溶胶,利用硅溶胶对碳纤维进行表面改性后,以环氧树脂为基体,制备碳纤维增强环氧树脂复合材料。利用SEM、TEM、万能试验机、偏光显微镜等对表面改性前后的碳纤维形态、力学性能及碳纤维/环氧树脂复合材料的界面性能进行表征,研究了硅溶胶改性碳纤维对其复合材料界面性能影响。结果表明,硅溶胶处理碳纤维后,在碳纤维表面原位生成具有膜-粒结构的表面层,改性后碳纤维的强度由2.41GPa提高到3.00GPa,界面性能也得到了明显改善,界面剪切强度(IFSS)提高了51.41%。As the surface modifier of carbon fiber, silica sol were prepared using silane coupling agent, tetraethoxysilane（TEOS） as the precursor and p-toluenesulfonic acid（PTSA） as the catalyst. The single fiber/ epoxy composite were prepared using the treated carbon fiber as the reinforcement. The carbon fibers were characterized by examination of the morphology and mechanical properties using SEM, TEM and tensile testing. Interracial shear strength （IFSS） of the composite was measured by single-fiber fragmentation testing. The results show that a layer of the membrane - grain structure on the surface of the carbon fiber is formed in situ after being treated by the silica sol. The tensile strength of a single fiber increases from 2.41 GPa to 3.00 GPa. The interracial properties of the composite is greatly improved and the interracial shear strength increases by 51.41%.

关 键 词：碳纤维 表面改性 溶胶-凝胶法 复合材料 界面剪切强度 

分 类 号：TB332[一般工业技术—材料科学与工程] TQ327.3[化学工程—合成树脂塑料工业]