原位法制备纳米银修饰碳纳米管环氧导电复合材料.pdf

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1、物理化学学~(WuliHuaxueXuebao)Acta．一Chim．Sin．2012，28(3)，711—719711March[Article]doi：10．3866／PKU．WHXB2011122l3www．whxb．pku．edu．cn原位法制备纳米银修饰碳纳米管环氧导电复合材料刘孔华刘岚高宏罗远芳贾德民f华南理工大学材料科学与Z-程学院，广州510640)摘要：将碳纳米管(CNTs)$U乙酸银同时引入到环氧树脂一咪唑固化体系中，在固化过程中原位热降解银-咪唑复合物生成纳米银修饰碳纳米管

2、，差示扫描量热仪(DSC)表明改性碳纳米管对环氧固化有一定的促进作用．采用X．射线衍射(XRD)表征了乙酸银和咪唑配合物[Ag(2E4MZ)2]Ac的结构，并提出了原位降解生成纳米银的机理．XRD结果表明，单独的乙酸银．咪唑配合物热降解生成的纳米银粒径为21—24nm，而配合物在环氧基体中生成的纳米银粒径为11—13nm．添加8O％(质量分数)片状微米银粉制备的纳米银，碳纳米管环氧导电复合材料其体积电阻率低达9×1OQ．cm．当纳米银和碳纳米管质量比为80：20时，复合材料导电性和剪切强度达到最

3、佳：采用扫描电镜(SEM)表征了复合材料的形貌结构．关键词：低温烧结：纳米复合材料：接触电阻：导电填料；体积电阻率中图分类号：0641．08／nsituPreparationofEpoxy—BasedConductiveNanocompositesContainingNanosilver·DecoratedCarbonNanotubesLIUKong-HuaLIULanGAOHongLUOYuan—FangJIADe—Min(CollegeofMaterialScienceandEngineer

4、ing,SouthChinaUniversityofTechnology,Guangzhou510640,R．China)Abstract：Nanosilver．decoratedcarbonnanotubes(CNTs)werepreparedbyintroducingCNTsandsilveracetateintoanepoxy-imidazolecuringsystemandsimultaneous／l门situthermaIdegradationofanAg．imidazolecompl

5、ex．DifferentiaIscanningcalorimetry(DSC)resultsindicatedthatmodifiedCNTsplayedacertainroleinpromotingthecuringoftheepoxy．Thestructureofthesilveracetate-imidazolecomplexwascharacterizedbyX．raydi仟ractionfXRD)．Thesizeofthenano．silverparticlesresultingfr0

6、mdegradationoftheAg—imidzolecomplexwasbetween21and24nm．andbetween11and13nmwhentheAg．imidzolecomplexwasaddedtotheepoxymatrix．Whensilverflakeswithamassfractionof80％wasaddedtothecomposites．thevolumeresistivityofthenanosilver．decoratedCNTs／epoxyconductiv

7、ecompositewasasIowas9×10Q·cm．TheoptimumconductivityandshearstrengthwereachievedwhentheratioofnanosilverandCNTswas80：20(massratio)．Scanningelectronmicroscopy(SEM)revealedthestructuraImorphologyofthecomposite．KeyWords：Lowtemperaturesintering；Nanocompos

8、ite；Contactresistance；Conductivefiller；VolumeresistivityReceived：October31，2011：Revised：December8，20l1；PublishedonWeb：December21，20l1．Correspondingauthor．Email：psliulan@scut．edu．cn；Tel：+86—20—87114857．TheprojectwassupportedbytheNationalNa~ralScienceF