摘要
采用静电自组装法制备了氧化石墨烯包覆针状羟基氧化铁的复合纳米粒子(GO@FeOOH),借助磁场使其在环氧树脂(EP)中发生取向,进而显著增强EP的断裂韧性。分别用X射线衍射、扫描电子显微镜、透射电镜及振动磁强计等对纳米粒子进行了表征,通过三点弯曲试验评估了EP/GO@FeOOH复合材料的临界应力强度因子(KIC),采用SEM分析了GO@FeOOH的增韧机理。实验结果表明:通过静电自组装,GO成功包覆在FeOOH表面,而非FeOOH负载在GO上。GO@FeOOH直径和长度分别为100 nm、1μm左右,饱和磁化强度7.18 emu/g,在0.09 T的磁场下能够被取向。在磁场诱导下,EP/GO@FeOOH(0.5%含量)的KIC提高最显著,达到了3.2 MPa·m1/2,分别比EP和无磁场诱导的EP/GO@FeOOH提高了140%和70.6%,同时GO和FeOOH表现出明显的协同效应。该复合材料的增韧机理主要包括粒子的拔出、脱粘以及裂纹偏转和基体的局部塑性形变等形式。
Graphene oxide coated needle-like hydroxy iron oxide composite nanoparticles(GO@FeOOH)were prepared by electrostatic self-assembly method,which were oriented in epoxy resin(EP)with the help of magnetic field,thus achieving remarkable toughening of EP.The nanoparticles were characterized by x-ray diffraction(XRD),scanning electron micrograph(SEM),transmission electron micrograph(TEM)and vibration magnetometer.The critical stress intensity factor(KIC)of GO@FeOOH/EP composite was evaluated by three-point bending test,and the toughening mechanism of GO@FeOOH was identified by SEM.The results show that GO is successfully coated on FeOOH surface by electrostatic self-assembly to obtain GO@FeOOH rather than FeOOH loaded on GO.The diameter and length of GO@FeOOH are about 100 nm and 1μm,respectively,and the saturation magnetization is 7.18 emu/g.The orientation of the nanoparticle can take place under the magnetic field of 0.09 T.Under the magnetic field,the KIC of EP/0.5%GO@FeOOH is increased the most significantly up to 3.2 MPa·m1/2,which is 140%and 70.6%higher than that of EP and GO@FeOOH/EP without magnetic field induction,respectively.Meanwhile,GO and FeOOH show significant synergistic effect on the toughening of EP.The toughening mechanism of the composite mainly includes the pull-out and debonding of the nanoparticle,crack deflection and local plastic deformation of the matrix.
作者
陈官
马传国
王静
付泽浩
戴培邦
Chen Guan;Ma Chuanguo;Wang Jing;Fu Zehao;Dai Peibang(School of Material Science and Engineering,Guilin University of Electronic Technology,Guilin 541004,China;Guangxi Key Laboratory of Information Materials,Guilin 541004,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2020年第6期8-13,共6页
Engineering Plastics Application
基金
国家自然科学基金项目(51763006)
广西自然科学基金项目(2016JJA160040)。
