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时间:2020-03-22
《导电炭黑填充聚偏氟乙烯层状复合材料的电磁屏蔽性能研究.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期塑料工业2014年7月CHINAPLASTICSINDUSTRY·93·聚偏氟乙烯/导电炭黑填充聚偏氟乙烯层状复合材料的电磁屏蔽性能研究:l:赵文鹏,沈佳斌,郭少云(高分子材料工程国家重点实验室四川大学高分子研究所,四川成都610065)摘要:以聚偏氟乙烯(PVDF)为基体、导电炭黑(CB)为填料,制备了PVDF/CB复合材料。研究了导电粒子含量、PVDF/CB与纯PVDF层层叠合等因素对PVDF电磁屏蔽效能的影响。结果显示,随着cB含量增加,PVDF/CB复合体系的屏蔽效能(SE)逐渐升高。根据电性能测试结果,导电
2、粒子越多。体系的电阻率越低,因而对电磁波的反射作用增强,导致sE值提高。将质量分数为15%的CB填充的PVDF与纯PVDF按不同层厚比叠合成2层样品后进行电磁屏蔽测试发现,随着PVDF/CB层层厚增加,PVDF层层厚降低,层状体系的电磁屏蔽性能逐渐提高。与具有相同层厚度、相同CB含量的PVDF/CB复合体系相比,层状体系的屏蔽效果明显高于前者。与测试结果相比,理论曲线的趋势基本一致,但测试曲线中出现屏蔽峰的频率更低。分析认为,当电磁波作用在层状体系上时,PVDF/CB层中的CB粒子可能会影响到相邻PVDF层中的电荷移动,使其达到最
3、大吸收需要更长的时间,这为宽频电磁屏蔽材料的制备提供了思路。关键词:聚偏氟乙烯;导电炭黑;电磁屏蔽效能;层厚比DOI:10.3969/j.issn.1005—5770.2014.07.024中图分类号:TQ325.4文献标识码:A文章编号:1005—5770(2014)07—0093—04InvestigationontheElectromagneticShieldingPropertiesofPVDF/CarbonBlack-filiedPVDFLaminateCompositesZHAOWen。peng,SHENJia—bin
4、,GUOShao。yun(StateKeyLaboratoryofPolymerMaterialsEngineering,PolymerResearchInstituteofSichuanUniversity,Chengdu610065,China)Abstract:Thepolyvinylidenefluoride/carbonblack(PVDF/CB)compositeswerefabricatedinthiswork.TheeffectsofCBparticlecompositionandlayeredassemblyof
5、PVDFandPVDF/CBontheelectromagneticshieldingpropertieshadbeenperformed.Theresultsindicatedthattheshieldingeffectiveness(SE)wasgraduallyenhancedwithincreasingCBloadingsinPVDF/CBcomposites.Accordingtothemeasuredresistivity,thespecimenfilledwithmoreconductiveparticleshada
6、lowervolumeresistivity,SOthattheSEvaluewasenhancedbyreflectingmoreelectromagneticwaves.WhenthePVDF/CBfilledwith15wt%CBwascombinedwithpurePVDFforming2-layerlaminates,theelectromagneticshieldingpropertiesweregraduallyimprovedwithincreasingthethicknessratioofPVDF/CBtopur
7、ePVDFlayers.ByfillingwiththesamecontentofCBparticles,itwasfoundthattheSEvalueofthelaminatecompositewasdistinctlylargerthanthatoftheconventionalPVDF/CBcomposite.Thetendencyofexperimentalshieldingcurvewasinaccordancewiththetheoreticalpredictedcurve.However,thefrequencyo
8、fshieldingpeakwaslowerthanthe【atter.Itwasconsideredthatwhentheelectromagneticwaveswereperformedonthe1aminatecomposites.theCB
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