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时间:2020-03-26
《RGO的制备及其对PMMARGO复合材料介电性能的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第42卷,第7期工程塑料应用Vo1.42,No.711Ju1.2O14ll2O14年7月ENGINEERINGPLASTICSAPPLICAT10Ndoi:lO.39690.issn.1001-3539.2014.07.003RGO的制备及其对PMMA/RGO复合材料介电性能的影响曾小鹏,张丽珍,袁文霞(北京科技大学化学与生物工程学院,北京100083)摘要:以氧化还原法为基础制备了两种非改性的还原氧化石墨烯(RGO):水合肼还原制备的RGO(RGO-N)和水合肼还原后真空退火制备的RGO(RGO-V),之后以这两种RGO和聚甲基丙烯酸甲酯(PMMA)为原料通过简单溶液复合法制备了PMMA/
2、RGO复合材料。通过透射电子显微镜、原子力显微镜和X射线光电子能谱对两种RGO的形貌和结构进行了表征。结果表明,这两种RGO都为单层或少数几层的片状结构,其中RGO—V的导电性高于RGO-N,且其厚度低于RGO-N。通过扫描电子显微镜对PMMA/RGO复合材料的断面形貌进行了表征,发现RGO能均匀地分散在PMMA中并且与PMMA有明显的界面相互作用。进一步研究了不同RGO含量下制备的PMMA/RGO复合材料介电性能的变化。结果表明,两种RGO均能提高复合材料的介电常数;且随着RGO含量的增加,复合材料的介电常数明显增大,而介电损耗变化不大。在室温及1000Hz下,当RGO—V体积分数为2.7
3、5%时,PMMA/RG0一V复合材料的介电常数为20.5,是纯PMMA的的5倍,是相同RGO含量下PMMA/RGO-N复合材料的2.5倍,而介电损耗仅为0.80。关键词:石墨烯;聚甲基丙烯酸甲酯;复合材料;介电性能中图分类号:TB332文献标识码:A文章编号:1001.3539(2014)07.0011.05PreparationofReducedGrapheneOxideandItsEffectivenesstoDielectricPropertiesOfPMMAZengXiaopeng,ZhangLizhen,YuanWenxia(SchoolofChemistryandBiologic
4、alEngineering,UniversityofScienceandTechnologyBeijing,Beijing100083,China)Abstract:Twokindsofnon.modifiedreducedgrapheneoxide(RGO)basedonoxidation.reductionmethod:RGO-NonlyreducedbyhydrazinehydrateandRGO—Vreducedbyhydrazinehydrateplusannealinginvacuum.Thenpoly(methylmethacrylate)(PMMA)/RGOcomposite
5、swerefabricatedwithasimplesolutionblendingmethodsbyusingthistwokindsofRGOandPMMA.ThemorphologiesandstructuresofthetwokindsofRGOwerecharacterizedbyTEM,AFMandXPS.TheresultsshowthatthetwokindsofRGOallconsistofsinglelayerorfewlayersgraphene.theconductivityofRGOVishigherthanthatofRGO-NandthethicknessofR
6、GO—VisthinnerthanthatofRGO-N.ThefractureappearancesofthePMMA/RGOcompositeswereinvestigatedbySEManditwasfoundthatthetwokindsofRGOcandispersewellinPMMAmatrixandbehaveevidentinteractionwithPMMA.ThedielectricpropertiesofPMMA/RG0compositeswithdifferentRGOcontentwerefurtherstudied.Theresultsindicatethatt
7、hetwokindsofRGOcanbothimprovethedielectricconstantofthecomposites.WithincreasementofRGOcontent,thedielectricconstantbecomehigherandthedielectriclossisstilllow.At1000Hzandroomtemperature.whenthevolumefractio
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