摘要
在对石墨进行热处理的基础上,以正硅酸乙酯(TEOS)为前驱体,采用溶胶-凝胶法和球磨法相结合,对鳞片石墨表面进行亲水改性处理.对热处理前后石墨表面的官能团进行红外(infrared,IR)光谱分析,发现一些疏水基团如酮基、双键等在热处理后消失,出现亲水性羧酸基团.考察改性前后石墨表面亲水性能的变化以及热处理对改性效果的影响.结果表明,改性后石墨表面的亲水性得到较大改善,热处理有利于对石墨表面的改性处理.以改性石墨为碳源,提高浇注料的流动性并降低浇注料的加水量,使用热重分析-差示扫描量热仪(thermogravimetry analysis-differential scanning calorimetry,TGA-DSC)对改性前后石墨的热失重进行表征.结果表明,改性后石墨的热失重率从100%降低至70%,石墨的抗氧化性得到很大提高.扫描电子显微镜(scanning electron microscope,SEM)及能谱(energy dispersive spectrometer,EDS)分析结果表明,改性后的石墨表面形成了致密的网状氧化硅包膜层.
On the base of the heat treatment on graphite, the modification of surface properties of flake graphite was made via sol-gel and ball milling methods using tetraethoxysilane （TEOS） as precursor. IR analysis showed that some hydrophobic groups, such as ketone and double bond, disappeared and hydrophilic carboxyl groups were formed after heat treatment. The results indicated that the hydrophilicity of the modification graphite was improved. TGA-DSC analysis revealed that the weight loss was reduced from 100% to 70%, as well as the oxidation resistance of graphite was improved greatly. SEM and EDS showed that a dense network silicon oxide layer formed on the surface of modified graphite
出处
《上海大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第6期762-767,共6页
Journal of Shanghai University:Natural Science Edition
基金
上海市重点学科建设资助项目(S30109)
上海市科委基金资助项目(08520513300)
教育部科学技术研究重点资助项目(208182)
关键词
溶胶-凝胶法
石墨
氧化硅
热处理
亲水性
抗氧化性
sol-gel
graphite
SiO2
heat treatment
water-wettability
oxidation resistance
作者简介
通信作者：杭建忠（1966～），男，教授，博士，研究方向为纳米涂层材料的制备及应用研究．E-mail：jianzhongh6998@shu．edu．cn
