PDA/Fe_(3)O_(4)上浆对碳纤维/聚酰胺6热塑性复合材料力学性能的影响  

Effect of PDA/Fe_(3)O_(4)sizing agent on mechanical properties of thermoplastic carbon fiber/polyamide 6 composites

作　　者：黄焘 武肖鹏 宁慧铭[1] 胡宁[1,2] HUANG Tao;WU Xiaopeng;NING Huiming;HU Ning(College of Aerospace Engineering,Chongqing University,Chongqing 400044,P.R.China;School of Mechanical Engineering,Hebei University of Technology,Tianjin 300401,P.R.China)

机构地区：[1]重庆大学航空航天学院,重庆400044 [2]河北工业大学机械工程学院,天津300401

出　　处：《重庆大学学报》2024年第8期123-131,共9页Journal of Chongqing University

基　　金：国家自然科学基金项目(U1864208)。

摘　　要：在碳纤维增强热塑性复合材料中,碳纤维(CF)与热塑性树脂基体间的界面强弱对其整体力学性能有巨大的影响。为改善CF与聚酰胺6(PA6)的界面性能,利用多巴胺(DA)的聚合与黏附特性,将纳米相四氧化三铁(Fe_(3)O_(4))引入到CF表面进行协同修饰,通过简单的浸渍共沉积,利用DA的氧化自聚合在CF表面构建聚多巴胺/纳米四氧化三铁(PDA/Fe_(3)O_(4))涂层。对CF改性前后表面微观结构与化学特性进行了表征,结果表明PDA/Fe_(3)O_(4)上浆剂能够显著提高CF表面的粗糙度与化学活性,加强纤维与树脂基体的机械啮合作用与化学相互作用。与未改性CF/PA6复合材料相比,制备得到的改性CF/PA6复合材料表现出优异的力学性能,其弯曲强度、层间剪切强度分别提高了30.8%和29.1%。In carbon fiber reinforced thermoplastic composites(CFRTP),the strength of the interface between the carbon fiber(CF)and the thermoplastic resin matrix has a significant impact on its overall mechanical properties.To improve the interfacial properties between CF and polyamide 6(PA6),nano-sized Fe_(3)O_(4)was introduced to the CF surface for synergistic modification using the polymerization and adhesion characteristics of dopamine(DA).Through simple immersion co-deposition,the poly-dopamine/nano-Fe_(3)O_(4)(PDA/Fe_(3)O_(4))coating was constructed on the CF surface by oxidative self-polymerization of DA.The microstructure and chemical characteristics of the CF surface before and after modification were characterized.The results show that adding the PDA/Fe_(3)O_(4)sizing agent significantly improves the roughness and chemical activity of the CF surface,and strengthens the mechanical engagement and chemical interaction between the fiber and resin matrix.Compared with unmodified CF/PA6 composites,the prepared modified CF/PA6 composites exhibit excellent mechanical properties,with their bending strength and interlaminar shear strength increased by 30.8%and 29.1%,respectively.

关 键 词：碳纤维 聚酰胺6 聚多巴胺 纳米四氧化三铁 界面性能 

分 类 号：TB332[一般工业技术—材料科学与工程] O3[理学—力学]