石墨片对环氧树脂的热学、力学和电学性能影响

文章编号:1007-8827(2015)05-0432-06

石墨片对环氧树脂的热学㊁力学和电学性能影响

Subhra Gantayat1,2,Gyanaranjan Prusty1,Dibya Ranjan Rout2,Sarat K Swain1

(1.Department of Chemistry,Veer Surendra Sai University of Technology,Burla,Sambalpur768018,India；

2.School of Applied Science(Physics),KIIT University,Bhubaneswar751024,India)

摘要:采用溶液技术制备出膨胀石墨增强环氧树脂复合材料㊂对石墨进行化学改性以提高与环氧树脂的相容性㊂采用XRD﹑FE-SEM和HR-TEM对环氧树脂/膨胀石墨复合材料进行表征㊂与环氧树脂相比,添加质量分数9%膨胀石墨后,该复合材料的热分解温度从340ħ升高至480ħ,抗张应力提高30%,导电率由10-15增加至10-5数量级㊂热学﹑力学和电学性能的显著提高,主要归因于膨胀石墨纳米片在环氧树脂基体中的良好分散性,从而可用于广泛的应用领域㊂

关键词:膨胀石墨；扫描电镜；透射电镜；导电率

中图分类号:TB332文献标识码:A

通讯作者：Sarat K Swain.E-mail：swainsk2＠yahoo.co.in

Expanded graphite as a filler for epoxy matrix composites to

improve their thermal,mechanical and electrical properties

Subhra Gantayat1,2,Gyanaranjan Prusty1,Dibya Ranjan Rout2,Sarat K Swain1

（1.Department of Chemistry,Veer Surendra Sai University of Technology,Burla,Sambalpur768018,India；

2.School of Applied Science（Physics）,KIIT University,Bhubaneswar751024,India）

Abstract:Expanded graphite(EG)-reinforced epoxy composites were prepared by a solution mixing method.The structure and morphology of the EG/epoxy composites were investigated by XRD,FE-SEM and HR-TEM.The EG prepared by acid oxidation and thermal expansion shows good compatibility with the epoxy resin that enters the EG layers to decrease their thickness to60-70nm,owing to its abundant oxygen-containing functional groups.With the addition of9wt%EG,the thermal decomposition temperature of the composite increases from340to480ħ,the electrical conductivity from10-15to10-5S/cm and the tensile stress is increased by more than30%.These improvements are attributed to the good dispersion of EG sheets in the epoxy matrix. Keywords: Expanded graphite；FE-SEM；HR-TEM；Conductivity

Received date:2015-03-05； Revised date:2015-10-08

Corresponding author:Sarat K Swain.E-mail:swainsk2＠yahoo.co.in

English edition available online ScienceDirect(http:／／／science／journal／18725805).

DOI:10.1016/S1872-5805(15)60200-1

1 Introduction

Polymer matrix composites are multi-phase mate-rials produced by combining polymer resins with rein-forcing fillers having improved properties in compari-son with the matrix materials.Hence,different fillers are used to enhance the physical and mechanical prop-erties of composites.Polymer matrix composites are of scientific and industrial interest because of their en-hanced properties arising from the reinforceing func-tion of nanofillers[1-4].Different conducting fillers such as carbon nanotubes and graphite have been ex-tensively studied because of their ability to increase the mechanical,thermal and electrical properties of the native polymers[5,6].

Epoxy resins are a class of thermoset materials available in various forms from low viscosity liquid to high melting solids,which are widely used as poly-mer matrices in composites,owing to their high strength,low shrinkage,excellent adhesion to sub-strates,chemical resistance and low cost.Most of polymers are generally electrical insulators with very low concentrations of free charge carriers.Thus they are non-conductive and transparent to electromagnetic radiations.This property made them incapable for the use as enclosures for electronic equipments.Hence, these limitations are the causes of growing research activities for electrically conducting polymers.Con-ducting polymers can be either inherently conductive or insulating polymers composited with conductive fillers.Conductive composites are used in light emit-ting devices,batteries,electromagnetic shielding and

第30卷第5期

2015年10月新型炭材料

NEW CARBON MATERIALS Vol.30 No.5 Oct.2015