氧化还原-RAFT乙烯基自缩合法制备水溶性超支化聚合物

氧化还原-RAFT乙烯基自缩合法制备水溶性超支化聚合物氧化还原/RAFT乙烯基自缩合法制备水溶性超支化聚合物

摘要：

超支化聚合物具有良好的性能，在医药、电子、涂料等领域有广泛的应用。本研究采用氧化还原/RAFT乙烯基自缩合法制备水溶性超支化聚合物。首先，我们合成了RAFT共聚反应的中间物(PMDETA-S-Br)，然后利用它和某些水性单体在无氧条件下共聚合，制备了水溶性RAFT单体。接着，在氧化还原条件下合成了水溶性超支化聚合物。利用核磁共振、凝胶渗透色谱、傅里叶变换红外光谱等技术对产物进行了表征。结果表明，制备的聚合物具有良好的水溶性和分子量分布较窄的特点，表明本方法制备聚合物的性能良好。氧化还原/RAFT乙烯基自缩合法是制备水溶性超支化聚合物的一种有效方法。

关键词：氧化还原，RAFT乙烯基自缩合，超支化聚合物，水溶性，分子量分布

Abstract:

Hyperbranchedpolymershaveexcellentpropertiesandarewidelyusedinfieldssuchasmedicine,electronics,andcoatings.Inthisstudy,awater-solublehyperbranchedpolymerwaspreparedbyoxidative-reductive/RAFTvinylself-condensation.First,wesynthesizedtheintermediateoftheRAFTcopolymerizationreaction(PMDETA-S-Br),andthenuseditandcertainwater-basedmonomerstocopolymerizeunderanaerobicconditionstopreparewater-solubleRAFTmonomers.Then,awater-solublehyperbranchedpolymerwassynthesizedundertheconditionofoxidative-reductivecoupling.Techniquessuchasnuclearmagneticresonance,gelpermeationchromatography,andFouriertransforminfraredspectroscopywereusedtocharacterizetheproduct.Theresultsshowthatthepreparedpolymerhasgoodwatersolubilityandanarrowmolecularweightdistribution,indicatingthatthismethodhasgoodpropertiesforpreparingpolymers.Oxidative-reductive/RAFTvinylself-condensationisaneffectivemethodforpreparingwater-solublehyperbranchedpolymers.

Keywords:oxidative-reductive,RAFTvinylself-condensation,hyperbranchedpolymer,water-soluble,molecularweightdistributionHyperbranchedpolymershaveattractedextensiveattentioninvariousfieldsduetotheiruniquestructureandexcellentproperties.Amongthevariousmethodsforpreparinghyperbranchedpolymers,oxidative-reductive/RAFTvinylself-condensationhasemergedasapromisingapproach.Inthismethod,RAFT(reversibleaddition-fragmentationchaintransfer)agentsareusedasmediatorstocontrolthepolymerizationprocess,whileoxidative-reductiveconditionsareusedtotriggertheself-condensationreaction.

Thepreparationofwater-solublehyperbranchedpolymersisofgreatimportancefortheirapplicationsinbiomedicalandenvironmentalfields.TheuseofRAFTagentsintheoxidative-reductive/RAFTvinylself-condensationmethodallowsfortheproductionofwater-solublehyperbranchedpolymerswithnarrowmolecularweightdistribution.ThisisachievedbycontrollingthedegreeofbranchingandthepolymerizationratethroughtheRAFTmechanism.

Thecharacterizationoftheresultingpolymerusingspectroscopyshowedthatithasgoodwatersolubilityandanarrowmolecularweightdistribution.Thisindicatesthattheoxidative-reductive/RAFTvinylself-condensationmethodhasgoodpropertiesforpreparingpolymers.Thenarrowmolecularweightdistributionsuggeststhatthismethodcanproducehigh-qualityhyperbranchedpolymerswithconsistentproperties.Thewatersolubilityofthepolymermakesitsuitableforvariousapplicationsinareassuchasdrugdeliveryorwatertreatment.

Inconclusion,theoxidative-reductive/RAFTvinylself-condensationmethodisaneffectiveapproachforproducingwater-solublehyperbranchedpolymerswithnarrowmolecularweightdistribution.Thismethodprovidesapromisingwayforthepreparationofhigh-qualitypolymerswithpotentialapplicationsinvariousfieldsFurthermore,theversatilityofthemethodallowsforthetunabilityofthepolymerproperties,suchasthedegreeofbranchingandmolecularweight,byvaryingthereactionconditions.Thisprovidesopportunitiesfortailoringthepolymerforspecificapplications.

Forinstance,thehyperbranchedpolymersproducedbythismethodhaveshowngreatpotentialasdrugdeliveryvehiclesduetotheirabilitytoencapsulatedrugsandtheirbiocompatibility.Thewatersolubilityofthepolymeralsomakesitsuitableforthedeliveryofwater-solubledrugs.Inaddition,thebranchedstructureofthepolymerprovidesahighsurfaceareafordrugloading.

Thehyperbranchedpolymerscanalsobeutilizedinwatertreatmentapplications.Thewatersolubilityofthepolymerallowsittodissolveinwater,makingitpossibletoremovepollutantsfromwater.Thebranchedstructureofthepolymeralsoprovidesahighsurfaceareaforadsorptionofpollutants,makingitaneffectiveagentforwatertreatment.

Asidefromdrugdeliveryandwatertreatment,hyperbranchedpolymersproducedbythismethodcanalsofindapplicationsinmolecularrecognition,catalysis,andoptoelectronics.Theversatilityofthismethodprovidesopportunitiesfortailoredpolymerpropertiestoaccommodatethesevariousapplications.

Inconclusion,theoxidative-reductive/RAFTvinylself-condensationmethodisapromisingapproachfortheproductionofwater-solublehyperbranchedpolymerswithnarrowmolecularweightdistribution.Theversatilityofthismethodallowsforthetunabilityofpolymerpropertiesforspecificapplications,suchasdrugdeliveryandwatertreatment.Moreover,thepotentialforapplicationsinotherfieldssuchasmolecularrecognition,catalysis,andoptoelectronicshighlightstheversatilityandpotentialofthismethodInadditiontothespecificapplicationsmentionedabove,theRAFTvinylself-condensationmethodforhyperbranchedpolymersynthesishaspotentialinseveralotherfields.

Molecularrecognitionisanimportantareaofresearchinchemistryandmaterialsscience,withapplicationsrangingfromsensorstodrugdesign.Hyperbranchedpolymersofferauniqueadvantageinthisfieldbecauseoftheirmultiplefunctionalgroupsandhighsurfacearea.TheabilitytocustomizethefunctionalizationofhyperbranchedpolymersthroughtheRAFTvinylself-condensationmethodmakesthemparticularlyattractiveformolecularrecognitionapplications.

Catalysisisanotherfieldwherehyperbranchedpolymersshowpromise.Theiruniquemorphologyandproperties,suchashighsurfacearea,makethemeffectivecatalystsupportmaterials.Additionally,theabilitytotunetheircompositionandfunctionalizationthroughtheRAFTvinylself-condensationmethodallowsforthecreationofhighlyspecificcatalystsfortargetedreactions.

Inoptoelectronics,hyperbranchedpolymerscanbeusedasluminescentmaterials,withpotentialapplicationsinlightinganddisplays.TheabilitytocontroltheirmolecularweightandbranchingstructurethroughtheRAFTvinylself-condensationmethodallowsfortheoptimizationoftheiropticalproperties.

Overall,theRAFTvinylself-condensationmethodforhyperbranchedpolymersy