简介：新奇转移功能为电镀物品眼的microring共鸣器交换的聚合物被介绍。在microring的光的共振的过程用公式被模仿。然后，结构的参数的优化被执行，并且特征被分析例如回声时间，输出光谱，操作电压，插入损失和串音被分析。模拟结果证明设计设备展出有利切换的功能。CLC数字TN256这个工作被中国(60576045)和国家鈥?的国家科学基金支持73鈥?工程(2006CB302803)

简介：Theuniaxialratchetingbehaviorofapolyetherimide(PEI)polymer'TECAPEI'wasstudiedusingstress-controlledcyclicloadingatroomtemperature,includingbothcyclictension-compressionwithnon-zerotensilemeanstressandtension-unloadingtests.Theexperimentalobservationswerefocusedonthetime-dependentratchetingofthePEIpolymerrevealedincyclictestsatdiversestressratesandwithdifferentpeakstressholdingtimes.TheresultsshowedthatthePEIpolymershowsobviousratchetingdeformation;i.e.,theratchetingstrainaccumulatesprogressivelyinthetensiledirectionduringstress-controlledcyclictestswithnon-zeromeanstress.Theratchetingishighlydependentontheappliedmeanstressandstressam-plitude,andisalsocharacterizedbyastrongtime-dependencyduringthecyclicstressingatdiversestressratesandwithdifferentpeakstressholdingtimes.Thetime-dependentratchetingofthePEIpolymeriscausedmainlybyitsremarkableviscosity.AcomparisonoftheratchetingoccurringbeforeandbeyondtheultimatestresspointofthePEIpolymershowedthattheratchetingbeyondtheultimatestresspointismoresignificantthanthatoccurringbeforethatpoint.

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简介：Thepresentpaperdescribesexperimentsaimedatdelineatingsignificantchemicalcharacteristicsofelectrochemicalreactionsinpolymericsolutions,includinghowrigidsolventenvironmentsaffectmasstransportrates,andalsodiscussesthepossibilitythatthemicroelectrodecoatedwithpoly(ethyleneoxide)(PEO)filmcanbeusedasgassensor.

简介：IntroductionMoleculeimprintingtechnologyhasmadegreatprogressinmakingchiralstationaryphasewithpredeterminedchiralselectivityagainstenantiomerssuchasaminoacidandtheirderivatives;sugarandtheirderivatives;naproxenandmethylbenZylamine’-’.Functionalmonomer...

简介：DistributedLagrangeMultiplier/FictitiousDomain(DLM/FD)methodwasemployedtosimulatethechannelflowwithpolymersuspension.ThepolymermoleculesweremodeledasFinitelyExtensibleNonlinearElastic(FENE)chainsandFENEchaincluster.Thecoiled-stretchedtransitionofFENEchainswasexaminedandthechangeinconfigurationofFENEchainswaspresented.Theaveragevelocityprofileofthefullydevelopedchannelflowwith64FENEchainswasgivenandfittedwellwiththepower-lawcurve.Thechangeofchainclusterconfigurationwasalsosimulated.ThesesimulationsshowthatDLM/FDmethodiscapableofsimulatingthemotionofnotonlyFENEchain,butalsoFENEchaincluster.

简介：Twokindsofrhodiumcatalystssupportedoncross-linkedstyrene-divinylbenzenecopolymerscontainingbipyridineoro-phenylenediaminehavebeenpreparedandfoundtodisplayhighactivityformethylacetatecarbonylationtoformaceticanhydride,theactivitiesareevenhigherthantheirhomogeneouscounterparts.XPSanalysiswasusedtocharacterizethesyntheticcatalysts.TheapparentactivationparametersweredeterminedtobeEα=73.3KJ/mol,ΔH^≠=66.3KJ/mol,ΔS^≠=-28.6eu.Theseparametersareveryclosetothoseinmethanolcarbonylationandimplytohaveanalogousmechanisminbothcases.

简介：Sphericalmacroporousadsorbentswithactivesitescapableofhydrogenbondingadsorptionbasedonurea-formaldehydecondensedpolymerweresynthesizedviareversedsuspensionpolymerization.Thepropertiesoftheobtainedadsorbentwerealsoinvestigatedindetail.Theresultsshowedthatthewaterpermeabilitycouldbeimprovedbyaddinghydroxyl-contatiningorganiccompoundmoietyintotheadsorbent.Thespecificsurfaceareaandaverageporediameteroftheseadsorbentsincreaswedwhiletheporosityfirstincreasedthendecreasedwiththeincreaseoftheamountoftheaddedhydroxyl-containingcompound.

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简介：PolymerLBfilmscontainingphotofuntionalgroupswerepreparedbythecopolymerizationofN-dodecylacrylamide（DDA）,whichhasanexcellentpropertytoformastablemonolayerandLBmultilayerswithphotofunctionalmonomers.Tris（2,2’-bipyridine）rutheniumcomplex,Ru（bpy）32+,oneofthemostwell-knownredox-activesensitizer,wasincorporatedintotheDDAcopolymer.ThephotogalvaniceffectbasedonthephotoinducedelectrontransferusingtherutheniumcomplexinthepolymerLBmonolayerwasdiscussed.

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简介：Awell-dispersedmetallicpalladiumcatalystmodifiedbypolymer-anchoredthioetherligandswasusedforthehydrogenationofcyclopentadienetocyclopentenewithhighactivityandselectivityinambientcondition.Theevidencestoshowthemodificationofcatalyticpropertiesbypolymeranchoredligandsweregiven.

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简介：Theionictransportprocessinpolymerelectrolytes(suchaspolyethyleneoxide)wassimulatednumericallyonatwodimensionalsquarelatticewherechargecarriersareaccommodatedbythelatticesitesconnectedrandomlywithavailablebondstorepresenttheamorphouschainconfiguration.Followingthedynamicbondpercolationtheory(DBPT),thechainmotioncontributiontotheionicconductionwasincorporatedviaperiodicalrenewaloftherandombondconfiguration.TocheckandextendthepredictionmadebyDBPTemployingglobalabruptbondrenewal,spatialcorrelationofthebondreassignmentwasintroducedtothesystemby:1)regionalbondrenewaland2)organizedbondmotion.ItisfoundthatthedifferencebetweenthediffusivitiessimulatedinvolvingregionalbondrenewalandthoseofDBPTbecomesnegligiblewhenthebondrenewalrateapproachesthecarrierhoppingrate.

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简介：Theeffectofwettabilityonpolymerbehaviorinporousmediaisinvestigatedthroughaseriesofsyntheticpolymerfloodsconductedinwater-andoil-wetBentheimandBereasandstonecores.Anewexperimentalsetupisusedinwhichthecoreeffluentpolymerconcentrationsarenotmeasuredduringpolymerflooding,butinsteadarepassedthroughacapillarytubethatisconnectedtothecoreoutlet.Usingthenotionofintrinsicviscosity,anapproximateexpressionispresentedthatcanbeusedtodeterminethebreakthroughtimeoftheinjectedpolymersolution.Inaddition,polymeradsorption,inaccessibleporevolume,andapparentviscositiesareevaluatedforallcoresandwettingconditions.Ingeneral,inthepresenceofresidualoil,theoil-wetcoresdisplaythelowestdegreeofpolymerretention(Berea)andthelowestinaccessibleporevolume-IPV(Bentheim).ThelargestwettabilityimpactonthepolymerbehaviorinporousmediaappearstobefortheBereaformation;polymerretentioninoil-wetcoresdecreases90%andIPV52%comparedtothecorrespondingamountsforthewater-wetones.Ontheotherhand,theestimatedpolymerretentionandIPVvaluesappeartobesimilarfortheoil-andwater-wetBentheimcores,thisisattributedtoquestionablewettabilityalteration.

简介：Inthispaper,wereportahigh-performanceP3HT/PCBMbulk-heterojunctionsolarcellwithapowerconversionefficiencyof4.85%fabricatedbyadjustingthepolymercrystallinityandnanoscalephaseseparationusinganultrasonicirradiationmixingapproachforthepolymer.ThegrazingincidenceX-raydiffraction,UV/Visspectroscopic,andatomicforcemicroscopicmeasurementresultsfortheP3HT/PCBMblendfilmsrevealthattheP3HT/PCBMfilmfabricatedbyultrasonicirradiationmixingoftheP3HTandPCBMsolutionsfor10minhasahigherdegreeofcrystallinity,ahigherabsorptionefficiency,andbetterphaseseparation,whichtogetheraccountforthehigherchargetransportpropertiesandphotovoltaiccellperformance.

简介：ToraisetheroomtemperatureionicconductivityandimprovethemechanicalstrengthofaPEO-basedpolymerelectrolyte,anoncrystallinetwo-componentepoxyelectrolytesystemhasbeenprepared.Thediglycidyletherofpolyethyleneglycolsasprecursorsofthesystemweresynthesizedbyatwo-stepprocess.Thepresumedstructureoftheproductwascharacterized,by13C,1HNMRandIRspectroscopy.Itwasfoundthataside-reactionoccurredbetweenthesecondaryhydroxylgroupofPEG-chlorohydrinandepichlorohydrininsomedegree,resultinginaby-productcontaining—CH2Clsidegroup.Byselectingacharacteristicsignal,whichisundistortedbytheincreaseinthelengthofCH2CH2—Osegment,a1HNMRapproachofdeterminingtheequivalentepoxyweight（EEW）wasproposed.ThemethodisvalidtospecimenseventhoughtheEEWisashighas2,000.TheexaminationofthespecimensbyDSCshowedthatepoxidationgreatlydepressedthecrystallinityofthePEG’s,whereastheTgwasraised.