聚醚砜/热膨胀石墨导电纳米复合材料的制备与性能研究  

Preparation of Electrically Conductive Polyethersulfone/Expanded Graphite Nanocomposites and Its Property Study

作　　者：卞军[1] 魏晓伟[1] 王琴[1] 龚述娟[1] 管征平[2] 

机构地区：[1]西华大学材料科学与工程学院特种材料与制备重点实验室,四川成都610039 [2]新加坡国立大学化学学院,新加坡117543

出　　处：《西华大学学报（自然科学版）》2011年第6期89-94,共6页Journal of Xihua University:Natural Science Edition

基　　金：西华大学重点科研基金项目(Z0910109)

摘　　要：为改善PES的力学性能、热性能和电性能,采用熔融插层法制备了聚醚砜(PES)/热膨胀石墨(EG)导电纳米复合材料(PES/EG),并利用透射电子显微镜(TEM)、扫描电子显微镜(SEM)、热重分析(TGA)、X射线衍射(XRD)、密度测试、吸水率测试以及拉伸试验分别对PES/EG导电纳米复合材料的微观形貌、热性能、结晶性能、密度、吸水性及力学性能进行了分析测试。结果表明,当EG的质量分数为6%时,PES/EG导电纳米复合材料的综合力学性能较好。热性能测试表明,加入质量分数为6%的EG使基体PES的T-5%提高了4.8 oC。TEM和SEM分析表明,EG的表面处理改善了与基体PES的界面相互作用,EG经熔融插层后以10～30 nm的薄片均匀分散于PES基体中。电性能测试表明,当加入质量分数为2%的EG时,复合材料的电导率提高了12个数量级,其导电逾渗阀值小于2%。综合考虑复合材料的力学和电性能,添加的EG的质量分数应低于6%。Polyethersulfone （PES）/expanded graphite （EG） nanocomposites are prepared by a conventional melt compounding technique in order to improve the mechanical, thermal and electrical properties. The structure, thermal properties, electrical conductivity, mechanical properties and density of the PES/EG nanocomposites are investigated using transmission electron microscopy （TEM）, scanning electron microscopy （SEM）, thermogravimetric analysis （TGA）, x-ray diffractometer （XRD） and tensile analysis, respectively. The experimental results show that the PES/EG nanocomposite with 6% mass fraction of EG exhibits the best mechanical properties. TGA results indicate that the thermal stability （ T-5% ） of PES matrix increases about 4.8℃ because of EG incorporation. XRD patterns show that PES chains are intercalated into the layers of EG during melt compounding. TEM and SEM images show that EG nanosheets are uniformly dispersed in PES matrix with the thiCkness of about 10-30 rim, and the surface pre-treatment of EG benefits the dispersion. The electrical property testing indicates that the electrical conductivity of PES is improved significantly when 2% mass fraction of EG is added. Conductivity of composite material increases 12 orders of magnitude. That is, the PES/EG nanocomposite has a low percolation thresholds value of 2%. Considering mechanical and electrical properties, the mass fraction of EG addition should be less than 6%.

关 键 词：聚醚砜 膨胀石墨 纳米复合材料 熔融共混 电导率 

分 类 号：TB383[一般工业技术—材料科学与工程]