简介：注意在溶解期间在watersoluble聚合物的健全吸收机制上对学习被给予。特殊设计的水溶性的聚合物涂层在我们的实验室被综合。健全变细性质在健全试管被测量。结果证明坡度聚合物答案的健全变细比制服的大。在分层的媒介取决于试验性的结果和声波繁殖的理论，坡度的机制水溶性的聚合物答案被开发。这机制能如下被描述：当它在水里被溶解时，水溶性的聚合物涂层形成了集中坡度层。这坡度层导致了声音的多重思考和吸收。最后，声能被变成热。

简介：磁性的聚合物粒子在象生物医学的治疗，诊断和分离技术那样的多样的区域发现了应用。这些应用要求粒子控制了尺寸和狭窄的尺寸分布在使用获得更好的控制和重制度。这份报纸在nano规模在磁性的聚合物粒子的准备考察最近的开发并且由包含磁性的部件与微规模溶解或在situ形成了聚合物。用乳化和埋入方法的粒子制造在微规模的尺寸生产磁性的聚合物粒子。然而，在用常规乳化方法的这个范围的粒子的生产在粒子尺寸和多分散性上负担得起很有限的控制。我们在使用膜和microfluidics乳化技术的其他的线路上报导，它有一个能力生产monodisperse乳剂和聚合物microspheres(与不到10%的变化的系数)在到一些100m的从submicrometer的范围。这些生产方法的表演考虑到未来应用被估计。

简介：SereralPd-SnO2/D3520andPd-PbO/D3520catalystswithPd/D3520,SnO2/D3520andPbO/D3520catalystsasreferencewerestudiedbymeansofIRandXPS.InteractionbetweenPdandthesecondmetalorbetweenmetalandsupportwasobserved.ResultsshowthatthereisastronginteractionbetweenPdandthesecondmetal,butthereisnotanobviousinteractionbetweenmetalandsupport.TheactiveconstituentisPd.HydrogenationactivityofthecatalystsisalteredbecauseoftheinteractionbetweenPdandthesecondmetal.TheactivityofthecatalysisforhydrogenationhasrelationtoouterlayervalenceelectrondensityofPd.

简介：Theeffectsofsamarium(Sm)oncarbon-methanationandcatalyticactivityoftheBa-Ru-K/AC(activecarbon)catalystforammoniasynthesiswereinvestigated.Theadditionofsamariumimprovedsignificantlytheactivityandstabilityofthecatalyst.Theresultsoftemperature-programmeddesorption(H2-TPD)andin-situ-TPSRFTIRindicatedthatsamariumimpededtheadsorptionofhydrogenonthecatalystsurface,thusleadingtothehighcatalyticactivityandresistancetocarbon-methanation.XRDpatternsreve...

简介：Silica-boundmercaptoselenaether-containingsilsesquioxaneanditsplat-inumorrhodiumcomplexweresynthesizedfromγ-(2,3-epithiopropyl)propyltrimethoxysi-laneviaring-openingreactionwithbis(2-hydroxyethyl)sclenide,followedbyhydrolysisandimmobilizationonfumedsilica,andthenreactingwithpotassiumchloroplatiniteorrhodiumchlorideinacetoneundernitrogenatmosphere.Itwasfoundthattwonoblemetalcomplexescancatalyzethehydrosilylationofolefinswithtriethoxysilaneeffectively.Theinfluencesoftemperature,theamountofcomplexused,thenatureofolefinoncatalyticactivitywereinvestigated.

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简介：Thecompositiondistribution（CD）andmicroisotacticitydistribution（ID）ofpropene/1-hexenecopolymersynthesizedbyMgCl2/DIBP/TiCl4（DIBP:diisobutylphthalate）weredeterminedbyfractionatingthecopolymersaccordingtocrystallinityandcharacterizingthefractionsby13CNMR.Theeffectsoftwoalkoxysilanedonors,triethoxyphenylsilane（PTES）anddimethoxydi-tert-butylsilane（TBMS）,onCDandIDofthecopolymrswerecompared.ThreemainpartsintheCDdiagramofeachcopolymerweredistinguished,whichwerecorrelatedtoactivecenterdistribution（ACD）basedonthreegroupeofdif-ferentactivecenters.Bystudyingthechangesin1-hexenecontent,microisotacticityandreactivityratioproductofthreetypicalfractions,theeffectsofexternaldonoronACDwerebetterelucidated.ItwasfoundthatTBMSshowsmuchstrongereffectsonACDthanPTES.Intheformersystem,mostfractionswereproducedonactivecenterswithrelativelylowerr1r2,higherreactivityto1-hexene,andhigherstereospecificityascomparedtothesystemwithoutexternaldonor.ItisconcludedthattheobservedveryextensivechangesinACDaremainlyresultedbytheformationofnewtypesofactivecenters,possiblybycoordinationofexternaldonortocertainpositionsonthecatalyst.

简介：ForagiventriangulationΔofaregionRofinterest,letS82（Δ）:={s∈C2（R）:s|1∈P8,l∈Δ}bethespaceofallsplinesofdegree8andsmoothness2,wheretdenotesanytriangleofΔandP8thespaceofpolynomialsoftotaldegree≤8.Furthermore,letS82（Δ）:={s∈S83（Δ）:s∈C3atv,v∈Δ}beasupersplinesubspaceofS82（Δ）.WeconstruelacollectionoflocallysupportedsplinesinS82（Δ）whichcanbeusedtoachievelhefullapproximationorderofS82（Δ）anditscardinalilyislessthanthedi-mensionofsupersplinespacespaceS82（Δ）.

简介：Thecomplexityoftheloadsactingontheoffshorewindturbines(OWTs)structuresandthesignificanceofinvestigationonstructuredynamicsareexplained.Testresultsobtainedfromascaledwindturbinemodelarealsosummarized.Themodelissupportedonmonopile,subjectedtodifferenttypesofdynamicloadingusinganinnovativeoutofbalancemasssystemtoapplycyclic/dynamicloads.Thetestresultsshowthenaturalfrequencyofthewindturbinestructureincreaseswiththenumberofcycles,butwithareducedrateofincreasewiththeaccumulationofsoilstrainlevel.Thechangeisfoundtobedependentontheshearstrainlevelinthesoilnexttothepilewhichmatcheswiththeexpectationsfromtheelementtestsofthesoil.Thetestresultswereplottedinanon-dimensionalmannerinordertobescaledtopredicttheprototypeconsequencesusingelementtestsofasoilusingresonantcolumnapparatus.

简介：Amodetransformerbasedonthequasi-verticaltaperisdesignedtoenablehighcouplingefficiencyforinterboardlevelopticalinterconnectsinvolvingsingle-modepolymerwaveguidesandstandardsingle-modefibers.Atriangularregionfabricatedabovethewaveguideisadoptedtoadiabaticallytransformthemodefromthefiberintothepolymerwaveguide.Theeffectsofthegeometricalparametersofthetaper,includingwidth,height,tipwidth,etc.,onthecouplingefficiencyarenumericallyinvestigated.Basedonthis,aquasi-verticaltaperforthepolymerribwaveguidesystemisdesigned,fabricated,andcharacterized.Couplinglossesof1.790.30and2.230.31dBpercouplerforthequasi-TMandquasi-TEmode,respectively,aremeasuredacrosstheopticalcommunicationCandLbands(1535to1610nm).Low-costpackaging,leadingtowidespreadutilizationofpolymericphotonicdevices,isenvisionedforopticalinterconnectapplications.

简介：Theelectromechanicalbehaviorofpoly(vinylidenefluoride-trifluoroethylene)[P(VDF-TrFE)]ferroelectricthinfilmwasinvestigatedusingthethreedimensional(3D)phase-fieldmethod.Variousenergeticcontributions,includingelastic,electrostatic,anddomainwallenergyweretakenintoaccountinthevariationalfunctionalofthephasefieldmodel.EvolutionofthemicroscopicdomainstructuresofP(VDF-TrFE)polymerfilmwassimulated.Effectsofthein-planeresidualstress,thefilmthicknessandexterna...

简介：有100，200和300祷告的链长度的单个聚合物链的结构的转变被平行temperingMD模拟调查。我们的模拟结果能与减少的温度从随机的卷捕获结构的变化到orientationally订的结构。清楚的转变作为温度的功能在旋转和全球orientational顺序参数P的半径的曲线上被观察，它表明了单个聚合物链的结构的形成。在旋转Rgx的方形的半径的三个部件之间的线性关系2，Rgy2，Rgz2并且全球orientational顺序P能在在结构上transformational过程下面被获得。在x之间的线性关系的斜坡(或Y轴)部件Rgx2(或Rgy2)并且P是否定的，当时Rgz，2作为P的功能是积极的。斜坡的绝对值与链长度成正比。一旦单个聚合物链拿随机的卷或订的配置，线性关系是无效的。conformational变化也在显微镜的规模上被分析。聚合物链能被当作由灵活的环连接的僵硬的茎的构造。从茎长度分发的指数地减少的行为的偏差变得突出，显示一链使硬产生导致与减少的温度处于trans状态结束的越来越多的片断。茎长度Ntr是大约21张契约显示聚合物链与特定的褶层长度被订。那么，模拟结果，显示出液体水晶的聚合物链的原型，是有用的理解水晶的聚合物的结晶化过程。

简介：Conventionalchloromethylation,paraformaldehyde/hydrogenchlorideinaceticacidmedium,wasappliedto1,2-dimethoxybenzene.Chloroform-solublepoly(3,4-dimethoxy-o-tolylene)wasobtainedwithanintrinsicviscosityof0.034dLg~(-1).ThepolymerwasevaluatedasacondensationredoxpolymerprecursorformedbyaFriedel-Craftsreaction.Cleavageofthemethoxygroupspresentinthispolymerresultedinpoly(3,4-dihydroxy-o-tolylene)whichmanifestedagreatair-oxidationresistance.Theredoxpropertyofthelatterpolymerwasfoundtobe1017mVbypotentiometrictitrationwith0.05Ncericammoniumnitrateat25℃.Thismidpotentialwascomparedtothatofcatechol,amonomericanalogue,underthesametitrationconditions.

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简介：新奇tripyridylporphyrin单体，5-[4-[2-(acryloyloxy)ethoxy]苯基]-l0,l5,20-tris(4-pyridyl)porphyrin(TrPyP)，被综合并且有acrylamide(AM)到的polymerized准备恐水病地联系水溶性的聚合物PAM-TrPyP。卟啉pendants的聚集行为被调查由紫外可见并且荧光系列。聚合物在甚至显示恐水病的协会的一个强壮的趋势冲淡解决方案。与增加集中，407nm的从416nm的Soret乐队变化的最大的吸收波长，和荧光为展览节制集中熄灭的内部过滤器效果改正了。所有结果显示那-卟啉pendants的相互作用在卟啉的PAM-TrPyP，和H总数的协会起一个关键作用主要在集中的答案被形成。在另一方面，散布的动态光(DLS)和传播电子显微镜学(TEM)被用来随集中增加在macromolecular集会的尺寸和结构跟随变化。聚合物聚集符合构造因此从松开的像泡的形态学改变到稳固的水珠。当答案的pH价值减少到4.3时，卟啉pendants上的pyridine一半能是protonated，在macromolecular矩阵形成的H总数被静电的排斥相互作用破坏。

简介：Polymernanoparticleswerepreparedinthemethylmethacrylate(MMA)/butylmethacrylate(BA)emulsioncopolymerizationprocessbyamodifiedmicroemulsioncopolymerizationmethod.2-Hydroxyethylmethacrylate(HEMA),acrylate(AA)andmethylacrylate(MAA)wereusedasreactivecosurfactants.Withthisprocesshighpolymer:surfactantweightratios(40:1orgreater),relativelyconcentrated(～30wt.%)latexesandsmall(～60nm)particlediameterswereobtained.PropertiesofthelatexeswerecharacterizedbyTEM,DSC,dynamiclightscattering,andIRspectroscopy.

简介：ＨＥＡＴＳ　ＯＦ　ＩＮＴＥＲＡＣＴＩＯＮ　ＯＦ　ＯＲＧＡＮＩＣ　ＢＡＳＥＳ　ＷＩＴＨ　ＰＯＬＹＭＥＲ　ＰＲＯＴＥＣＴＥＤ　ＣＡＴＡＬＹＳＴ　ＰＶＣ－ＡｌＣｌ＿３ＨＥＡＴＳＯＦＩＮＴＥＲＡＣＴＩＯＮＯＦＯＲＧＡＮＩＣＢＡＳＥＳＷＩＴＨＰＯＬＹＭＥＲＰＲ...

简介：影响在海水沉浸，以及结果在潮湿散开上把聚合物矩阵composites的厚度压成薄片为glass/isopolyester(G/IPE)的composites的机械性质降级，carbon/isopolyester(C/IPE)，glass/vinylester(G/VE)和carbon/vinylester(C/VE)，在这份报纸被调查。把3压成薄片并且在厚度的10mm，使用湿手上篮技术制作，被描绘因为在人工的海水媒介的潮湿吸收，和他们的曲折力量和interlaminar砍力量(ILSS)降级被学习。潮湿散开被观察是到Ficks的anamolous为3的法律和10mm在散开的以后的阶段的厚样品。10mmthick样品的潮湿渗透是比3mm的大的二～三份订单厚的，当潮湿浸透的时间仍然保持未改变时。随增加把厚度压成薄片，1.4%为C/VE增加的潮湿浸透并且7%为G/IPE。剩余曲折力量和ILSS在10mm的情况下是更大的在200天暴露以后的厚标本。折断的标本的SEM检查在10mm显示出纤维/矩阵debonding的更大的层次厚标本。

简介：Rareattentionhasbeenpaidtothecomparisonbetweenamonomeranditscorrespondingpolymerintermsoftheoptoelectroniccharacteristics.Inthisarticle,amodelH-shapedmoleculeanditscorrespondingpolymer,bothofwhichexhibitedsimilarpropertiesincludingblueemissionandsolutionprocessing,weredesignedandsynthesized.Optoelectronicpropertiesandvariouskindsofstabilityfeatures,includingthethermostabilities,spectralstabilitiesandamplifiedspontaneousemissioncharacteristicofthemonomerandpolymerwereinvestigated.Ingeneral,thecorrespondingpolymerPHexhibitedsimilaroptoelectronicpropertiesbutdeterioratedstabilitiescomparedwithitsH-shapedmonomerH-1probablyowingtothesimilarchemicalstructurebutthewidermolecularweightdistributionandmetalcatalystresidue.Importantly,monomerH-1displayedacomparableASEthresholdvaluewithitspolymerPH,suggestingthatH-shapedfluorene-basedsmallmoleculesmaybemorepromisingopticalgainmediainsolidstateamplifersandlasers.

简介：AnovelacrylicmonomerbearingaromaticetherealitygroupN-(p-phenoxy-phenyl)methacrylamide(MAPOA)wassynthesizedandpolymerized.ThefluorescencespectraofMAPOAanditspolymerwerestudied,showingthatthepolymerdisplaysastrongerfluorescencethanitsmonomeratthesamechromophoreconcentration.ThefluorescenceofP(MAPOA)wasquenchedbyaddingelectrondeficiencymonomerssuchasMMA,ANetc..Itisanotherexampleofshowingthe"fluorescencestructuralself-quenchingeffect"aswereportedpreviously,fromwhichitisdemonstratedagainthatthisphenomenonisnotanaccidentalonebutacommoneffectforacrylicmonomersbearingelecton-donatingchromophores.ThephotopolymerizationofANsensitizedbyMAPOAandP(MAPOA)wasstudied.Thekineticequationofthepolymerizationwasobtainedandrepresentedasfollows:Rp∝[MAPOA]0.38×[AN]0.78,Rp∝[P(MAPOA)]0.33×[AN]0.71TheoverallactivationenergiesweredeterminedtobeEa=24.22kJ/mol(MAPOA)andEa=26.31kJ/mol[P(MAPOA)]respectively.ThefluorescenceanalysisoftheresultedP(AN)showedthatthesensitizeralsoenteredintotheP(AN)chains.AmechanismoftheformationofachargetransfercomplexandfreeradicalinitiationwassuggestedforthephotopolymerizationofANsensitizedbyMAPOAandP(MAPOA).