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简介：Thesuccinylationofcornstarchbyslurryreactionhasbeenstudiedusingsodiumhydroxideascatalyst.SeveralreactionparametersafJectingthesuccinylationwereinvestigatedincludingtheconcentrationofstarchinwater,theratioofsuccinicanhydridetostarch,thereactiontimeandthereactiontemperature.Thefavorableconditionsforanintermediatedegreeofsubstitution(DS)andreasonablyhighreactionefficiency(RE)arepH8.5～9.0,50%starchbyweighttowater,succinicanhydridetostarchI/I(w/w),reactiontime4h,reactiontemperature30℃Undertheseconditions,theDSof0.45andREof28%wereachieved.Theadditionofanadequateamountofcrosslinkingagentimpartedstarchsuccinatewaterabsorbency.

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简介：ThecatalyticreactionofNOwithCOanddecompositionofNOovermetalmodifiedACFswereinvestigatedandcomparedwithothercarrierssupportedcatalysts.ItisdemonstratedthatPd/ACFandPd/Cu/ACFhavehighcatalyticactivityforthereactionofNO/CO,whilePt/ACF.Pt/Cu/ACFandCo/Cu/ACFhaveveryIowcatalyticactivityinsimilarcircumstance.Pd-modifiedACFpossesseshighcatalyticdecompositionofNOat300℃.Pd/CBandPd/GACpresentgoodcatalyticdecompositionabilityforNOonlyatlowflowrate.Pd/G,Pd/ZMSandPd/Ahowever,donotshowanycatalyticactivityforNOdecompositionevenat400℃.Catalytictemperature,NOflowrateandloadingofmetalcomponentsaffectthedecompositionrateofNO.ThecoexistenceofCuwithPdonCu/Pd/ACFleadstocrystallineofpalladiumtomoreunperfectedsoastothatincreasethecatalyticactivity.

简介：Theoneplusone(1+1)modeofhydrosilationreactionofladderlikecis-isotaticpolyallylsilsesquioxane(AllyI-T)andpolyhydrosilsesquioxane(H-T)usingdicyclopentadienylplatinumdichloride(Cp2PtCl2)asthecatalystleadstotheformationofanewpolyorganosiloxane(POS).ThepresenceofnanoscaletubularstructureintheproductPOSwaspreliminarilyprovedbyIR,1H-NMR,differentialscanningcalorimetry(DSC),X-raydiffraction(XRD),gelpermeationchromatography(GPC),atomicforcemicroscopy(AFM)andmolecularsimulation.

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简介：包含1,3,4-oxadiazole单位的热地稳定的聚合物作为溶剂在pyridine与芳香/脂肪族的二度酸氯化物通过芳香/脂肪族的bis-tetrazole混合物的Huisgen反应被综合了。获得的聚合物甚至在象DMSO和DMF那样的极的aprotic溶剂不可溶解或稍微可溶。相对高的固有的粘性价值(0.611.33dL/g，在在25点的0.125%H2SO4????????????????????????倠？？

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简介：这个工作报导杂环的functionalized聚合物的合成和描述，poly(triazole-etherimidazole)s(PTAEI)从终止dialkyne的混合物，3-(4,5二度(4-(propargyloxy)苯基)由使用按反应的-1H-imidazol-2-yl)-9-ethyl-9H-carbazole,。PTAEI被描绘并且他们的性质象溶解度那样，热，机械，photophysical和金属离子吸附被调查。这些聚合物让重量平均臼齿的群众(M<潜水艇class=“a-plus-plus”>在1910026700g/mol的范围的w)，在极的aprotic溶剂展出了优秀溶解度并且由答案扔形成了低有颜色的灵活薄电影方法。他们与玻璃转变温度展出了好热稳定性(T<潜水艇class=“a-plus-plus”>在160之间的g)??????????千偓???????????????????吗？？

简介：One-stepreactioncompatibilizedmicrofibrillarreinforcediPP/PETblends(CMRB)weresuccessfullypreparedthrougha'slitextrusion-hotstretching-quenching'process.CrystallizationbehaviorandmorphologyofCMRBweresystematicallyinvestigated.Scanningelectronicmicroscopy(SEM)observationsshowedblurryinterfaceofcompatibilizedcommonblend(CCB).ThecrystallizationbehaviorofneatiPP,CCB,microfibrillarreinforcediPP/PETblend(MRB)andCMRBwasinvestigatedbydifferentialscanningcalorimetry(DSC)andpolarizedopticalmicroscopy(POM).TheincreaseofcrystallizationtemperatureandcrystallizationrateduringnonisothermalcrystallizationprocessindicatedbothPETparticlesandmicrofibrilscouldserveasnucleatingagentsandPETmicrofibrilsexhibitedhigherheterogeneousnucleationability,whichwerealsovividlyrevealedbyresultsofPOM.ComparedwithMRBsample,CMRBsamplehaslowercrystallizationtemperatureduetoexistenceofPETmicrofibrilswithsmalleraspectratioandwiderdistribution.Inaddition,sinceinsitucompatibilizertendstostayintheinterphase,itcouldalsohinderthediffusionofiPPmoleculestothesurfaceofPETphase,leadingtodecreaseofcrystallizationrate.Two-dimensionalwide-angleX-raydiffraction(2D-WAXD)waspreformedtocharacterizethecrystallinestructureofthesamplesbyinjectionmolding,anditwasfoundthatwell-developedPETmicrofibrilscontainedinMRBsamplepromotedformationofβ-phaseofiPP.

简介：Agreenapproachtothesynthesisandmorphologicalcontrolofhighperformancepolyimidesandtheirnanohybridshish-kebabsinglycerolthroughreaction-inducedcrystallizationofnylon-salt-typemonomerswasreported.Crystallinepolyimidenanoplatescanbeobservedbydirectpolycondensationofpyromelliticacidwithvariouskindsofaliphaticoraromaticdiamines.Withtheexistenceofcarbonnanotubes,thepolyimidescanbesuccessfullydecoratedonthesurfaceofCNTsthroughareaction-inducedhetero-epitaxialcrystallizationprocess,andresultedinnovelpolyimide/CNTnanohybridshish-kebabs(NHSKs)structures.ThemorphologiesoftheNHSKscanbefine-tunedthroughchangingtheconcentrationofmonomersorthereactiontemperature,especiallythroughtheintroductionofdynamiciminechemistry,theformationprocessofNHSKscanbeattributedtoasoftepitaxymechanism.ThusagreenapproachforthesynthesisofhighperformancepolyimidesandtheirCNTbasednanohybridstructureswasexplored,whichshouldbeofgreatvaluefortheirapplicationsinhighperformancereinforcednanocomposites.

简介：Poly(etherurethane)s(PEU),includingPEUI15andPEUH15,werepreparedthroughchain-extensionreactionofpoly(ethyleneglycol)(PEG-1500)usingdiisocyanateasachainextender,includingisophoronediisocyanate(IPDI)andhexamethylenediisocyanate(HDI).ThesePEUswereusedtotoughenpolylactide(PLA)byphysicalandreactiveblending.Thermal,morphological,mechanicalandagingpropertiesoftheblendswereinvestigatedindetail.ThesePEUswerepartiallycompatiblewithPLA.Theelongationatbreakofthereactiveblendsinthepresenceoftriphenylphosphate(TPP)forPLAwithPEUH15orPEUI15wasmuchhigherthanthatofthephysicalblends.Theagingtestwascarriedoutat-20°Cfor50hinordertoacceleratethecrystallizationofPEUs.ThePEUsinthePLA/PEUblendsproducedcrystallizationandformednewphaseseparationwithPLA,resultinginthedeclinedtoughnessofblends.Fortunately,undertheagingcondition,althoughPEUH15inblendscouldalsoformcrystallization,thereactiveblendofPLA/PEUH15/TPP(80/20/2)hadhighertoughnessthantheotherblends.TheelongationatbreakofPLA/PEUH15/TPP(80/20/2)droppedto287%fortheagingblendfrom350%fortheoriginalblend.ThetensilestrengthandmodulusofPLA/PEUH15/TPPblenddidnotchangeobviouslybecauseofthecrystallizationofPEUH15.