学科分类
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32 个结果
  • 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。

  • 标签: 聚甲基丙烯酸甲酯 聚偏二氟乙烯 聚偏氟乙烯 PVDF 萃取结晶 有机玻璃
  • 简介:Inthispaper,weproposeandexperimentallydemonstrateamethodtorealizeapolarizationdetectorbyusingacommerciallyavailablepolymethylmethacrylate(PMMA)pipe.Anasymmetricpolarization-relatedstructureisfabricatedbyetchingdifferentgratingstructuresontheexternalsurfaceofthepipe.Theresultsshowthatwhenthepiperotatesupto90°,thepeakofthetransmissionspectrumcanevidentlyshifttowardsthelowfrequency,whichmeansthepipewithgratingstructurescanserveasapolarizationdetector.Thisdesignpossessesthemeritsofasimplestructureandeasyfabrication.

  • 标签: 偏振相关 探测器 太赫兹 玻璃管 聚甲基丙烯酸甲酯 光栅结构
  • 简介:作为Rowa集团的一部分,徳国RowaLack有限公司最近新增了一条生产线,生产广泛应用于聚甲基丙烯酸甲酯(PMMA)的颜料制剂,产品以Rowalid品牌销售。该项目旨在进一步推进该项业务并优化产品组合。RowaLack最近还在塞费塔尔的工厂委托建立了一个用于聚氯乙烯(PVC)和PMMA颜料制剂生产的新型中试压延机。

  • 标签: PMMA 着色剂 聚甲基丙烯酸甲酯 颜料制剂 产品组合 品牌销售
  • 简介:Anewkindofrareearthmaterialwithhighefficientlong-persistentphosphors,suchasSrAl2O4:Eu,Dy,hasbeendevelopedinrecentyears.ThePMMAwithlong-persistentphosphorsistypicaloneofapplicationsforthephosphors.Inthiswork,wetrytoprobeintotheaffectionofthemanufactureprocessonthePMMAwithlong-persistentphosphors,toanalyzeitsperformance,anditsluminescencebehavior,especiallytostudytheself-excitationofthePMMAwithlong-persistentphosphors.

  • 标签: long-persistent PHOSPHORS PMMA RARE earths
  • 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。

  • 标签: 聚甲基丙烯酸甲酯微球 化学液相沉积 单分散 复合微球
  • 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。

  • 标签: PMMA高分子材料 静态压缩 DSGZ本构模型 J-C本构模型
  • 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。

  • 标签: 二氧化硅粒子 聚丙烯酸酯 PMMA 改性层 超声波 甲基丙烯酰氧丙基三甲氧基硅烷
  • 简介:以揭示可燃粉尘云中传播火焰的基本结构和燃烧反应区的反应特性为目的,用CCD和高速摄像仪拍摄了PMMA粉尘云中传播火焰的自发光和粒子的激光散射图片,结合离子探针和微细热电偶测试技术,根据实测结果分析了有机可燃物PMMA粉尘云中传播火焰的基本结构;揭示了燃烧反应区的反应特性、反应强度分布规律和温度分布规律.

  • 标签: PMMA粉尘云 火焰结构 燃烧反应区 发光区 粉尘爆炸
  • 简介:赢创工业集团(EvonikIndustriesAG)已制定计划剥离其MMA和PMMA业务。公司发言人Wagner说:“剥离过程在3月我们首次宣布该计划时启动,但它包含了大量的内部工作。”赢创的MMA和PMMA总产能分别为60万吨/年和40万吨/年。根据Wagner的说法,公司主要的MMA生产基地位于德国韦瑟灵和沃尔姆斯。另外两家位于在路易斯安那州Fortier和中国上海的生产基地。位于德国埃森的总部公司表示,公司正在寻求潜在的合作伙伴关系,或将完全剥离该业务。作为公

  • 标签: 剥离业务 完全剥离 赢创完全
  • 简介:二层的结构由PS/PMMA-DR1合成电影组成多孔的硅cladding层上的平面波导层在我们的实验被制作。导致的栅栏被二根NdYAG激光横梁的相互作用在多孔的silicon/PMMA-DR1波导在1064nm基于第三个非线性的光性质形成。第一份订单的衍射效率使衍射光被测量是大约0.2%全部的输出。

  • 标签: 多孔渗水硅 PMMA-DR1 自衍射 动态光栅 复合薄膜
  • 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.

  • 标签: 聚甲基丙烯酸甲酯 发光量子效率 复合掺杂 辐射率 受激发射截面
  • 简介:Thispaperstudiestheinterfacecuringstressesbetweenpolymethylmethacrylate(PMMA)andcompositebymeansofdigitalspecklecorrelationmethod(DSCM).AnewmethodbycombiningDSCMwiththemarkerpointsisdevelopedtomeasuretheinterfacecuringstresses,andthemeasurementprincipleisintroduced.TheinterfacecuringstressesbetweenPMMAandcompositewithdifferentcuringbondingconditionsaremeasuredandanalyzed,thisindicatesthattheresidualstressforfurnaceheatingandfurnacecooling...

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  • 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.

  • 标签: 相分离 PMMA/SAN混合物 流变学性质 聚甲基丙烯酸甲酯 聚(苯乙烯-共-丙烯腈)
  • 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.

  • 标签: 蛋白质吸附 表面修复 聚甲基丙烯酸甲酯 QCM-D
  • 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.

  • 标签: 开关性能 电光 聚甲基丙烯酸甲酯 甲基丙烯酸缩水甘油酯 非线性光学活性 差示扫描量热法
  • 简介:Spinodalphaseseparationbehaviorofpoly(methylmethacrylate)/poly(styrene-co-acrylonitrile)(PMMA/SAN)blendswasinvestigatedbythetime-resolvedsmallanglelightscattering(SALS)technique.Itwasfoundthattheinfluenceoftemperatureonthescatteringintensityevolutionfollowedthetime-temperaturesuperpositionprinciple.TherelationshipbetweentemperatureandtherelaxationtimeofscatteringintensityI(t)canbewelldescribedbytheWilliams-Landel-Ferry(WLF)function.

  • 标签: SPINODAL DECOMPOSITION mechanism Small angle light
  • 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.

  • 标签: CdSe量子点 可饱和吸收体 全光纤结构 调Q脉冲 PMMA 激光掺杂