偶氮苯基双亲共聚物的溶液自组装及其多重刺激响应研究-材料工程专业毕业论文

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1、摘要应性，结果表明：pH在6．9～5．5范围内，pH降低，胶束的粒径呈现先增大后减小的趋势，球形核壳结构被破坏，形成不规则的聚合物团聚体；当pH值降至5．5时，胶束会发生解组装，表现出敏感的pH响应性。这一敏感性来源于聚合物链中有较多的叔胺基团。UV-Vis、NMR和FTIR研究胶束的还原响应性，双亲共聚物经Na2S204还原后，偶氮侧基断裂，生成取代苯胺，增加分子链的亲水性，诱导胶束解组装过程。5．基于P(POSSMA．CO—AZOMA—CO．DMAEMA)胶束的多重刺激响应性，选取NileRed作为疏水模型分子，探索胶束包覆和释放疏水分子的

2、性质。结果表明：弱酸性或还原性环境均能诱导胶束快速高效地释放出NileRed分子。关键词：偶氮苯；POSS；双亲共聚物；聚集诱导荧光发射；多重刺激响应II万方数据AbstractAbstractStimuli—responsivepolymericsystemsintegratingwithspecialresponsivemoietiescanundergoalterationoftheirchemicalstructuresandphysicalpropertiesinresponsetoexternalstimulus．Agreatdea

3、lofworkhasbeendonetodesignmulti—stimuli-responsivepolymericsystemstoenrichapplicationsinthefieldsofdrugcontrolledrelease．Azobenzene，asaspeciallightandreductiondual．．stimuli．．responsivemoietyundergotrans-cisisomerizationunderUVlightirradiationandcleavageinreducingenvironment．

4、Owingtodual-stimuli-responses，incorporationofazobenzeneintoapolymerchainstogenerateamulti．．stimuli．．responsiveamphiphileshavebeenanactiveresearchinthefieldofmacromolecularself-assembly．Here，wesynthesizedanazobenzenemonomerwithpolymerizationactivityandpreparedaseriesofazobenz

5、ene-basedamphiphilesviaRAFTpolymerization．Furthermore，weresearchedtheself-assemblybehaviorsoftheseamphiphiles，fluorescenceandreleasepropertiesofself-assemblynanoaggregates．Themainachievementsofthisworkareshownasfollows：1．HydroxyazobenzeneHOAZOWaSsynthesizedbydiazoreactionand

6、couplingreaction．AzobenzenemonomerAZOMAwaspreparedbythereactionbetweenHOAZOandmethacryloylchloride．ThestructuresofHOAZOandHOAZOwerecharacterizedbyNMR，FTIRandMS2．Azobenzene—basedcopolymers，P(POSSMA-co—AZOMA—CO‘DMAEMA)，weresynthesizedwithcomonomersofAZOMA，POSSMAandDMAEMAviaRAF

7、Tpolymerization．Inthisway,thelightandreductiondual—responsiveazogroup，pH—responsivetertiaryaminegroupandsuperhydrophobicPOSSmoietywereincorporatedintothepolymerchaintogeneratemulti··stimuli--responsiveamphiphilesFurthermore，thestructuresoftheseamphiphileswerecharacterizedbyN

8、MR，FTIRandGPC3．Sphericalmicelleswithcore—shellstructurewerepreparedbyself-a