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ID:32467302
大小:2.33 MB
页数:75页
时间:2019-02-06
《钛酸钡聚偏氟乙烯复合材料的制备及其介电性能研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、BaTi03/PVDF复合材料的制备及介电性能研究摘要高介电常数的陶瓷/聚合物基复合材料具有聚合物低的加工温度和柔韧性等优点,在电工和电子工业领域有着广泛的应用前景,可以用来制作具有任意形状的电容器的介质材料。而电子器件小型化、多功能化的发展趋势要求电介质材料具有尽可能高的介电常数,因此提高陶瓷/聚合物复合材料的介电常数具有重要意义。本文以PvDF作为基体,以BaTi03为高介电填充组分,制备了BaTi0。/PvDF复合材料,并研究了其介电性能。结果发现:复合材料的制备工艺和BaTiO。颗粒尺寸
2、对其介电性能有显著的影响;发现采用溶液混合法制备BaTi03/PvDF复合材料时KH550偶联剂的最佳用量为1.0wt%;以乙醇作为分散介质,利用BaTi03纳米粒子与PvDF粒子问的吸附作用,采用混合法制各的纳米复合材料的介电性能与其它常用方法所制备的复合材料的介电性能相当;双粒径BaTi0,填充的复合材料在填充量=50v01.%时的介电常数高于单粒径填充复合材料,但同时在≤105Hz的频率范围内其介电损耗也远高于单粒径填充复合材料;复合材料介电常数随BaTi0,粒径增加呈非单向的增大,BaT
3、i0,粒子问接触引起偶极子相互作用的强弱对复合材料介电常数有重要影响。研究结果为陶瓷/聚合物基高介电复合材料的应用奠定了一定的基础。关键词:复合材料,介电性能,KH550偶联剂,制备,粒径STUDYONPREPARATIONANDDIELECTRICPROPERTYoFBaTi03/PVDFCOMPoSITESABSTRACTCeraIllic/polymercomposites,wllichcombinesprocessibilityandflexilityofpolymer,isapromi
4、singmaterialinelectricalengineeringandelectronicindustfyfields,suchasdielectricincapacitorswithallkindsofshape.Thetrendofminiaturizationandmulti—mnctionalityofelectroncomponentsrequiresthatdielectricmaterialshaVedielectricconstantashighaspossible.The
5、refore,itisVerysignificantforimproVingthedielectricconstantoftheceramic/polymercomposites.Inthisstudy,preparationandproperIiesofBajn03/polyVinylideneauoride(BaTi03/PVDF)compositeswerestudied.TheresultsshowedthatboththepreparationprocessanddiameterofB
6、£门晤03playedasignificantroleondielectricpropertyofthecomposites.TheoptimalmassfractionofKH550couplingagentwas1.0wt%whentheBaTi03/PVDFoompositeswereprepaTedbysolutionmethod.TheBaTi03/PVDFnanocompositeswerefabricatedbyanoVeltechniquethatutilizedthenatur
7、alabsorptionofbetweenBaTi03andPVDFparticlesinabsoluteethan01.AnddielectricIIconstantofthenanocompositeswasashighasthatpreparedbyothersoluIions.DielectricofthecompositeswithdoublediameterBaTi03wasmorethanthatofChecompositeswithsinglediameterBaTi03atac
8、eramicloadingVolumelessthan50V01.%.ButIheValuesofdielectriclossofthecompositeswerejustcontraryatmeasuredfrequencyoflessthan105Hz.ThediameterofBa7n03particlehadalsoanimportanteffecIondielectricpermittiVityofmeBaTi03/PVDFcomposites,whichresultedfromthe
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