摘要
采用硅烷偶联剂KH550对电化学阳极氧化处理后的碳纳米管-碳纤维多尺度增强体(CNTs-CF)进行表面改性处理,制备了环氧树脂(EP)/CNTs-CF复合材料。对增强体表面形貌与元素、增强体表面自由能及纤维增强体/EP基体接触角、增强体改性EP复合材料界面强度进行了测试,考察了硅烷偶联剂KH550对CNTs-CF纤维表面以及EP/CNTs-CF复合材料界面性能的影响。结果表明,偶联剂KH550成功接枝在CNTs-CF增强体的表面。由于偶联剂KH550对增强体表面的缺陷有修复作用,改性后的增强体的单丝拉伸强度有明显提升。硅烷偶联剂在增强体-树脂基体界面中形成了有效的化学键链接,增强了EP复合材料界面的力学性能。低浓度的KH550溶液可有效提升EP复合材料界面性能,而高浓度KH550溶液则会堆积在增强体表面,形成低强度界面层,反而降低EP复合材料的界面性能。经测试,使用1%浓度的偶联剂KH550溶液处理后,CNTs-CF增强EP树脂复合材料的层间剪切强度达到93.68MPa,比未处理CNTs-CF增强EP复合材料提升29.84%。
Coupling agent KH550 was utilized to improve the surface properties of carbon nanotubes grown carbon fiber(CNTs-CF)oxidized by electrochemical anode oxidization,epoxy resin(EP)/CNTs-CF composites were prepared.Surface morphology and element,fiber reinforcement surface free energy,fiber reinforcement/EP matrix contact angle and fiber reinforcementmodified epoxy resin composites interfacial strength were tested to investigate the influence of coupling angent on fiber surface and composite interfacial properties.The results show that the coupling agent KH550 has been grafted on the fiber surface successfully.Due to the healing effect of the coupling agent KH550 to the reinforcement surface,single fiber tensile strength of treated carbon nanotubes grown carbon fiber has a remarkable improvement.The siliane coupling agent form a strong chemical bond on the reinforcement-matrix interface,causing the increase of the mechanical properties of the composite interface.Low density of siliane coupling agent solution could effectively enhance the composite interfacial property,while high density of siliane coupling agent solution would stack on the surface of the reinforcement,forming a low strength interfacial layer that could decrease the composite interfacial properties.The interfacial shear strength of the carbon nanotube-carbon fiber-epoxy resin composite treated by 1%coupling agent KH550 solution has reached to 93.68 MPa,29.84%higher than untreated CNTs-CF reinforced EP composites.
作者
黄春旭
陈刚
王启芬
于倩倩
王志远
Huang Chunxu;Chen Gang;Wang Qifen;Yu Qianqian;Wang Zhiyuan(Shandong Non-metallic Materials Research Institute,Jinan 250031,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2022年第6期136-143,共8页
Engineering Plastics Application
关键词
碳纤维
碳纳米管
偶联剂KH550
界面强度
carbon fiber
carbon nanotube
coupling agent KH550
interfacial strength
