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:Inthispaper,weproposeandexperimentallydemonstrateamethodtorealizeapolarizationdetectorbyusingacommerciallyavailablepolymethylmethacrylate(PMMA)pipe.Anasymmetricpolarization-relatedstructureisfabricatedbyetchingdifferentgratingstructuresontheexternalsurfaceofthepipe.Theresultsshowthatwhenthepiperotatesupto90°,thepeakofthetransmissionspectrumcanevidentlyshifttowardsthelowfrequency,whichmeansthepipewithgratingstructurescanserveasapolarizationdetector.Thisdesignpossessesthemeritsofasimplestructureandeasyfabrication.
简介:Anewkindofrareearthmaterialwithhighefficientlong-persistentphosphors,suchasSrAl2O4:Eu,Dy,hasbeendevelopedinrecentyears.ThePMMAwithlong-persistentphosphorsistypicaloneofapplicationsforthephosphors.Inthiswork,wetrytoprobeintotheaffectionofthemanufactureprocessonthePMMAwithlong-persistentphosphors,toanalyzeitsperformance,anditsluminescencebehavior,especiallytostudytheself-excitationofthePMMAwithlong-persistentphosphors.
简介:通过前处理,在聚甲基丙烯酸甲酯微球表面形成活性中心,采用化学液相沉积法.在微球表面沉积镍合金层,制成了单分散PMMA/Ni复合粒子,采用XPS、XRD、SEM、比表面分析仪、微米激光粒度分布仪等多种分析测试方法对制得的复合粒子的结构及性能进行表征,结果表明:制备的复合粒子大小约10μm,呈单分散性,分散度在0.025左右,包覆层呈较好的球形,结构致密,形状规则,具有一点的柔软度,合金层大约在0.5μm,主要成分为含高磷的镍磷合金。
简介:摘要:聚甲基丙烯酸甲酯(Polymethyl methacrylate,PMMA,俗称有机玻璃)作为火箭舱盖和舷窗的主要铣削加工材料,任何缺陷都将导致发射失败,故研究其材料力学性能非常重要。本文通过设计水浴循环加热装置对PMMA进行不同温度、应变率下静态压缩试验研究其力学性能。同时分别拟合了PMMA的DSGZ和J-C本构模型,发现DSGZ本构模型可以描述PMMA高分子材料的弹性-屈服-应变软化-应变硬化变化过程,在应变0-0.3区间内预测结果与实验结果较为一致。J-C本构模型在应变0.1-0.5区间内预测结果与实验结果较为一致。
简介:Polymethylmethacrylate(PMMA)包含了硅石nanocomposite粒子被准备由超声地在硅石大音阶的第五音的表面上在situ导致了甲基methacrylate(MMA)的聚合。nanoparticles被Fourier变换描绘红外线的光谱学(FTIR),传播电子显微镜学(TEM),thermogravimetry(TG),扫描电子显微镜学(SEM)。结果证明有36nm的一种平均尺寸的coreshell结构nanocomposite粒子被获得,并且包含层的聚合物的厚度是大约8nm。有tert丁基hydroperoxide(TBHP)和增加的硅石大音阶的第五音的预告的处理?-methacryloxypropyltrimethoxysilane(MAPTS)显著地提高了封装效果。由聚合物层修改了,硅石粒子能很好在矩阵被驱散并且利用了改进polyacrylates的机械表演。
简介:TwoEu(Ⅲ)complexes,(tris-4,4,4-trifluoro-1-phenyl-1,3-butanedione)(1,10-phenanthroline)europium(Ⅲ)[Eu(tpb-H)3(phen)]and(tris-4,4,4-trifluoro-1-phenyl-1,3-butanedione)(2,2'-bipyridine)europium(Ⅲ)[Eu(tpb-H)3(bipy)]weresynthesizedfrombi-dentaloxygenandnitrogenligands.LuminescentpolymerswerefabricatedbyincorporatingdeuteratedEu(Ⅲ)complexesinpoly(methylmethacrylate)(PMMA)matrixes.LuminescentPMMAcontainingEu(tpb-D)3(phen)exhibitedrelativelyhigherquantumyield[Φ,(48.7±4)%],fasterradiationrate(kr,7.49×102s-1),sharperredemission[fullwidthathalfmaximum(FWHM),6.3nm]andlargerstimulatedemissioncross-section(SEC,1.29×10-20cm2).ThevalueofSECisthesameorderasthatofNd-glasslaserforpracticaluse.Additionally,thethermalpropertiesofEu(tpb-H)3(phen),Eu(tpb-H)3(bipy),Eu(tpb-D)3(phen)-PMMA,andEu(tpb-H)3(bipy)PMMAwerestudied,indicatingthattheEu(Ⅲ)complexesandluminescentPMMAcanbeusedforalong-termperiodinhightemperatureenvironment.PreparedluminescentpolymersincludingEu(tpb-D)3(phen)havepromisingapplicationsinnovelorganicEu(Ⅲ)devices,suchasthehigh-powerlasermaterialsandopticalfibers.
简介:Thispaperstudiestheinterfacecuringstressesbetweenpolymethylmethacrylate(PMMA)andcompositebymeansofdigitalspecklecorrelationmethod(DSCM).AnewmethodbycombiningDSCMwiththemarkerpointsisdevelopedtomeasuretheinterfacecuringstresses,andthemeasurementprincipleisintroduced.TheinterfacecuringstressesbetweenPMMAandcompositewithdifferentcuringbondingconditionsaremeasuredandanalyzed,thisindicatesthattheresidualstressforfurnaceheatingandfurnacecooling...
简介:Basedonthepremisethattheadditionofglassbeads(GB)couldhardlyinfluencethelinearviscoelasticityinlowfrequency(ω)regionforhomogeneouspolymersystems,thedynamicrheologicalbehaviorsofunfilledandfilledpoly(methylmethyacrylate)(PMMA)/poly(styrene-co-acrylonitrile)(SAN)blendswerestudiedinordertoexploretheeffectofGBonthephase-separationofbinarypolymermatrix.ResultsshowthatGBhasaninducedeffectonthephase-separation,whichembodiesthatthephase-separationtemperature(T_s)ofPMMA/SANblendfilledwithGBislowerthanthatoftheunfilledsystem.ThehighercontentofGB,thehigheristhe“secondaryplateau”ofωintheterminalregionofstoragemodulus(G')versusωplot.The“secondaryplateau”appearingintheterminalregionisattributedtothephase-separationofPMMA/SANblendsanditbecomesmoreflatforfilledpolymerblendsunderthesameconditions.However,itissuggestedthatthiskindof“inducedeffect”isrelatedtotheGBcontent;thehighercontentofGBparticlesmightenhancetheinteractionbetweentheparticlesandpolymermatrix.Moreover,itisfoundthattheadditionofGBalsohasaninfluencemoreorlessonthemorphologyanddomainsizeofpolymermatrix.Itisbelievedthattheplotofdynamicviscosity(η')versusthelossviscosity(η')issensitivetoexaminetheeffectinducedbyGBonthephase-separationofbinarypolymermatrix.
简介:ThispaperreportstheadsorptionofBovineSerumAlbumin(BSA)ontoDielectricBarrierDischarge(DBD)processedPoly(methylmethacrylate)(PMMA)surfacesbyaQuartzCrystalMicrobalancewithDissipationmonitoring(QCM-D)tech-nique.ThepurposeistostudytheinfluenceofDBDprocessingonthenatureandscaleofBSAadsorptiononPMMAsurfaceinvitro.ItwasobservedthatDBDprocessingimprovesthesurfacewettabilityofPMMAfilm,afactattributabletothechangesinsurfacechemistryandtopography.ExposureofthePMMAtoPhosphateBuffedSaline(PBS)solutionintheQCM-Dsystemresultedinsurfaceadsorptionwhichreachesanequilibriumafterabout30minutesforpristinePMMA,and90minutesforprocessedPMMAsurface.SubsequentinjectionofBSAinPBSindicatedthattheproteinisimmediatelyadsorbedontothePMMAsurface.ItwasrevealedthatadsorptionbehaviourofBSAonpristinePMMAdiffersfromthatonprocessedPMMAsurface.AsloweradsorptionkineticswasobservedforpristinePMMAsurface,whilstaquickadsorptionkineticsforprocessedPMMA.Moreover,thedissipationshiftofproteinadsorptionsuggestedthatBSAformsamorerigidstructureonpristinePMMAsurfacethatonprocessedsurface.ThesedatasuggestthatchangesinwettabilityandattendantchemicalpropertiesandsurfacetextureofthePMMAsurfacemayplayasignificantroleinBSAadsorptionprocess.
简介:Anon-linearoptical(NLO)materialwassynthesizedbymeansofasimplemethod.Thismaterialcanbeappliedinelectro-optical(EO)devices,suchasEOswitchesandmodulators.TheDisperseRed1(DR1)wasdopedinpolymethyl-methacrylate-co-glycidylmethacrylate(PMMA-co-GMA)astheNLOactivechromophore.Thesynthesisprocessandmaterialstructurewereexpressed.Thethermalproperties,surfacemorphologyandopticalcharacteristicsofthematerialwereinvestigatedbymeansofdifferentialscanningcalorimetry(DSC),thermogravimetricanalysis(TGA),atomicforcemicroscopy(AFM),andm-linestechnique.Usingthereflectiontechnique,thevalueoftheelectro-opticalcoefficientγ33wasmeasuredas11pm/Vatawavelengthof1310nm.AnEOswitchwithnanosecondresponsebasedonthismaterialhasbeenfabricated.
简介:Spinodalphaseseparationbehaviorofpoly(methylmethacrylate)/poly(styrene-co-acrylonitrile)(PMMA/SAN)blendswasinvestigatedbythetime-resolvedsmallanglelightscattering(SALS)technique.Itwasfoundthattheinfluenceoftemperatureonthescatteringintensityevolutionfollowedthetime-temperaturesuperpositionprinciple.TherelationshipbetweentemperatureandtherelaxationtimeofscatteringintensityI(t)canbewelldescribedbytheWilliams-Landel-Ferry(WLF)function.
简介:WedemonstratethegenerationofQ-switchedpulsesfromanytterbium-dopedfiberlaser(YDFL)usingquantumdot(QD)CdSeasapassivesaturableabsorber(SA).TheCdSeQDisfabricatedbythesynthesisofCdO,Se,andmanganeseacetateandparaffinoilandoleicacidasthesolventandsurfactant,respectively.TheCdSeQDisthendopedintopoly-methyl-methacrylate(PMMA)viaanemulsionpolymerizationprocess.APMMAhostedCdSeQDthinflakewithahomogeneousendsurfaceisthenformedandplacedbetweentwoferrulesandassembledinaYDFLcavitytoachievetheQ-switchingoperationwitharepetitionrateof24.45to40.50kHzwhilevaryingthepumppowerfrom975to1196mW.Thepulsewidthchangesfrom6.78to3.65μswithamaximumcalculatedpulseenergyat0.77μJatapumppowerof1101mW.ThisworkmaybethefirstdemonstrationofCdSeQD-basedQ-switchinginanall-fiberconfigurationthatshouldgiveproportionalinsightintosemiconductorQDmaterialsinphotonicsapplications.