简介:结晶化修正(vinylidene氟化物)(PVDF)poly为PVDF并且poly的混合电影(甲基methacrylate)(PMMA)被调查。集体crystallinity(c)并且进一步,阶段内容(PVDF的F()),与不同集体比率为asprepared混合电影被学习。另外,c和F的变化()一旦PMMA部件从相关混合系统被移开,系统地被探查。DSC,FTIR和XRD大小都显示了那1)c,F()并且甚至阶段的内容(F())与PMMA的增加减少了;2)与PMMA的抽取,c和F()当时,增加了F()减少。它是值得注意的c和F的增加()取决于提取PMMA(EPMMA)的相对数量,即,越多PMMA被移开,越多c和F()增加。这些结果从PMMA成分揭示阻碍者效果到PVDF的结晶化,并且因而,当PMMA被提取时,这限制将被释放。
简介:Themainrequirementsforbatteryseparatorsarehighporositywhichcanservepathwaysoflithiumionandspaceforgelelectrolytestoimpregnateinamembraneandmechanicalstrengthtoalloweasyhandlingforbatteryassembly.Generally,itappearsthetrade-offrelationshipbetweentheporosityandmechanicalstrengthofthemembrane.PVdFcompositemembranescontainingnano-sizeclayswereusedtoimprovethemechanicalstrengthofthemembranewithoutaffectingthemembraneporosity.Thecompositemembraneswerepreparedbyphaseinversionmethodcontrollingthemembranepreparationconditionssuchasretentiontime.Theresultantmembranesshowincreasedmechanicalpropertieswithsimilarmembraneporosityaround80%comparedtothepristinePVdFmembrane.Incorporationofnonoclaycanbeconsideredasaneffectivemethodtoimprovethemechanicalstrengthinporousmembranesupports,especiallyinaseparator.
简介:将聚偏氟乙烯(PVDF)和阳离子交换树脂(PS-SO3H)、单甘酯(GMS)以适当的比例充分混合均匀,经造粒机挤出即得到新型PVC膜改性助剂。最佳工艺条件为:配比PVDF/PS-SO3H/GMS为82∶14∶4,用于PVC膜混合料,PVC树脂/PVC膜改性助剂的最佳配比为85∶15,加入膜改性助剂后,膜制品的透水率得到提高,力学性能也有所改善。
简介:对PVDF涂层聚酯纤维建筑织物膜材和节点进行了一系列单调单向拉伸试验,包括常温(23℃)和高温(70℃)下母材、高温(70℃)下40mm和75mm宽搭接焊缝节点以及膜边铝合金型材节点,对其破坏形式、强度和变形力学特性进行了分析.介绍了具体的试件制作、实验仪器和试验方法.结合规程提出了温度对于材料的影响系数以及高温(70℃)下焊缝的最小宽度,对膜结构工程设计应用具有参考价值.
简介:摘要:在锂离子电池的研究和应用中,水性聚偏氟乙烯(PVDF)涂覆隔膜作为一种重要的材料,具有独特的优势和潜力。随着对环境友好和可持续发展的需求增加,水性PVDF涂覆隔膜的研究也得到了广泛关注。目前,水性PVDF涂覆隔膜的研究已经取得了显著进展。研究人员致力于优化配方、涂覆工艺和添加剂等方面,在提高隔膜的导电性、稳定性和韧性方面取得了重要成果。同时,加强对水性PVDF涂覆隔膜在锂离子电池中的应用研究,已经实现了在电动汽车、移动电子设备和能源领域的商业化应用。
简介:Anovelhydrophilicnanocompositeadditive(TiO2-g-PNIPAAm)wassynthesizedbythesurfacemodificationoftitaniumdioxide(TiO2)withN-isopropylacrylamide(NIPAAm)via"graft-from"technique.Andthenanocompositemembraneofpoly(vinylidenefluoride)(PVDF)/TiO2-g-PNIPAAmwasfabricatedbywetphaseinversion.Thegraftdegreewasobtainedbythermo-gravimetricanalysis(TGA).Fouriertransforminfraredattenuatedreflectionspectroscopy(FTIR-ATR)andX-rayphotoelectronicspectroscopy(XPS)characterizationresultssuggestedthatTiO2-g-PNIPAAmnanoparticlessegregatedonmembranesurfaceduringthephaseseparationprocess.Scanningelectronmicroscopy(SEM)wasconductedtoinvestigatethesurfaceandcross-sectionofthemodifiedmembranes.ThewatercontactanglemeasurementsconfirmedthatTiO2-g-PNIPAAmnanoparticlesendowedPVDFmembranesbetterhydrophlilicityandthermo-responsivepropertiescomparedwiththoseofthepristinePVDFmembrane.Thewatercontactangledecreasedfrom92.8°ofthePVDFmembraneto61.2°ofthenanocompostiemembrane.Bovineserumalbumin(BSA)staticanddynamicadsorptionexperimentssuggestedthatexcellentantifoulingpropertiesofmembraneswasacquiredafteraddingTiO2-gPNIPAAm.ThemaximumBSAadsorptionat40°Cwasabout3timesthanthatat23°C.ThepermeationexperimentsindicatedthewaterfluxrecoverratioandBSArejectionratiowereimprovedatdifferenttemperatures.
简介:ThepiezoelectriccompositescontaininghighlyorientedBaTiO3whiskersasactivephaseandPVDFasmatrixhavebeenpreparedbymicro-holeextrusionandorientationincarriedfibers.ThemorphologyoforientedBaTiO3whiskersandmicrostructureofthecompositeswereobservedbySEM.Asforitselectromechanicalproperties,itisfoundthatthedielectricconstant,piezoelectricconstantandremnantofpolarizationintheBaTiO3whisker-PVDFcompositeareconsiderablyhigherthanthatintheBaTiO3powders-PVDFcomposite,whilethelossfactorsfollowtheoppositetrend.FortheBaTiO3whisker-PVDFcomposite,thevaluesofε,d33andPrparalleltothewhiskerorientation(normalspecimen)aremuchhigherthanthatperpendiculartothewhiskerorientation(parallelspecimen).Thesignificanteffectsoftheconnectivepassagesofactivephaseonelectromechanicalpropertiesofthepiezoelectriccompositeshasalsobeeninvestigated.