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1、第卷第期电测与仪表Vol.44No.5042018年第期ElectricalMeasurement&InstrumentationDec.2007纳米石墨烯掺杂浓度对XLPE击穿性能的影响*郭佳1，周凯1，任显诚2，杨培2，雷勇1（1．四川大学电气信息学院，成都610065；2．四川大学高分子科学与工程学院，成都610065）摘要：制备了分散性良好的6种不同配比XLPE/纳米石墨烯聚合物，运用差式扫描量热法排除了结晶度对击穿性能的影响；对试样进行了工频击穿强度测量并通过拉伸强度测试评估了机械性能。实验表明，掺杂纳米石墨烯能使聚合物的工频击穿强度最大提
2、高27.66%，拉伸强度最大提高10.64%，在工业实现上有积极意义。通过等温去极化电流计算聚合物陷阱密度及能级，并结合动态热机械分析从界面分子结合力探究不同含量石墨烯影响击穿性能的机理。研究表明掺杂少于0.01wt%的纳米石墨烯能增大陷阱能级，同时增大聚乙烯基体分子间作用力，进而提升聚合物击穿性能。关键词：纳米石墨烯；击穿强度；拉伸强度；交联聚合物DOI:中图分类号：TM855文献标识码：A文章编号：TheiInfluenceofgraphenenanosheetconcentrationonbreakdownstrengthofXLPEGuoJi
3、a1，,ZhouKai1，,RenXiancheng2，,YangPei2，,LeiYong1(1.SchoolofElectricalEngineeringandInformation,SichuanUniversity,Chengdu610065,China.2.CollegeofPolymerScienceandEngineering,SichuanUniversity,Chengdu610065,China)Abstract：XLPE/nanographenewithgooddispersibilitywaspreparedviaadding
4、sixdifferentcontentsofnanographene.Differentialscanningcalorimetrywasusedtomeasurethecrystallinityandtheeffectofitonthebreakdownstrengthofthepolymerwaseliminated,theindustrialfrequencybreakdownstrength,DCleakagecurrentandflashovervoltageofthesampleswasstudied.Themechanicalprope
5、rtiesofthepolymerswereevaluatedviatensilestrengthtest.Experimentsshowthattheadditiongraphenenanosheetscanincreasetheindustrialfrequencybreakdownstrengthofthepolymerbyabout27.66%.TheDCflashvoltageincreaseswiththeincreaseofgraphenedopingcontents.AtthesametimeMeanwhile,thetensiles
6、trengthwasincreasedby10.64%,whichhaspositivesignificanceinindustrialrealization.Theisothermaldepolarizationcurrentswereusedtocalculatethetraplevelsonthepolymersurface.Incombinationwiththedynamicthermo-mechanicalanalysis,themechanismoftheeffectofsixkindsofnanographenedopingonthe
7、breakdownstrengthofthepolymerwasexploredfromtheinterfacialmolecularbindingforcelessthan0.01wt%.Itillustratesthatthesmallcontentofdopinggraphenenanosheetscanenhancetheintermolecularforceofthematrixandreducereducesthedistributionofshallowtrapsinthepolymers.Keywords：graphenenanosh
8、eet,breakdownstrength,tensilestrength,crosslinkedpolym
