智能材料英文PPT.ppt

Intelligentpolymermaterials 高材03班余函帅婉华 Maincontent Intelligentmaterial Itisalsoknownassmartmaterial whichhasthefunctionofperception selfdiagnosis selfadaptationandselfrepair Features polymermaterialsintegratingperception driverandinformationprocessing toformanintelligentpropertiessimilartothebiologicalmaterial BiologicalfunctionoftheIntelligentmaterials HavefeedbacksystemInformationaccumulationandrecognitionfunctionLearningabilityandpredictivefunctionResponsefunctionSelfrepairingfunctionSelfdiagnosticfunctionDynamicbalanceandadaptivefunction Amaterialsystemwiththeformoftheabovestructure itmaybereflectedofthefollowingcharacteristics Withsensingcapabilities candetecttheoutsideworld orinternal ofthestimulusintensityWithinformationtransferfunction tosetuptheoptimalwaytochooseandcontrolresponseFunctionofresponseandexecutiontotheenvironmentaltransformationSensitiveresponseTheexternalstimuluscanquicklyreturntotheoriginalstate Intelligentmaterial Intelligentmetalmaterials Intelligentinorganicnonmetallicmaterials Intelligentpolymermaterials advantanges MultilevelstructureWeakintermolecularforcesSidechainiseasytointroducefunctionalgroupsFacilitatemoleculardesignandfinecontrolEasycoating Conducivetotheperceptionoftheenvironmenttoachieveenvironmentalresponse Classificationofintelligentpolymermaterials SmartpolymergelShapememorypolymermaterialsIntelligentpolymercomposites Definitionofpolymergels Thegelisbetweenliquidandsolidmaterialform Polymergelismadeupofmoleculesbetweenthree dimensionalcrosslinkednetwork itsnetworkconsistsofthemacromolecularmainchainandsidechainwithhydrophilicgroups polarity andhydrophobicgroups or and dissociativegroup solventwasfixedinthemolecularnetwork Althoughsolventcannotbedissolvedthethreedimensionalnetworkstructureofpolymer buthighmolecularcompoundsolventaffinitygroupspartcanthroughsolventeffectandmakethepolymerswelling thisalsoisoneofthereasonsfortheformationofpolymergel Definitionofpolymergels Threedimensionalnetworkstructureofpolymergels Thesystemofthree dimensionalpolymernetworkandsolventSolventswelling whichcanbesolventswellingBiggestfeature volumephasetransition Thepolymergel whichcanbechemicallybonded canbechemicallyandphysicallycross linked Classificationofpolymergels Accordingtotheclassificationofsolventinthepolymernetwork Polymergel Hydrogel Organicgel Hydrogelsarethemostcommonandoneofthemostimportantpolymergels Thevastmajorityofcreatures thepresenceofnaturalplantgelandmanysyntheticpolymergelarebelongtothehydrogel Andbiologicalgelhaveexcellentintelligenceandhighstrength Intelligenthydrogelisakindofhydrogelwhichcanproducesensitiveresponsetoexternalstimuli Hydrogelscanabsorbhundredsoftimesbeyondtheweightofwater soitisalsousedinhealthmaterials Classificationofpolymergels Thevolumephasetransitionofgel Gelequilibriumswellingvolumechangeswiththechangesoftheenvironment Swellingphase Contractionphase Environmentalfactorschange Volumediscontinuity Internalcause FanDehuaforce hydrogenbond hydrophobicinteractionandelectrostaticforce Preparationofsmartpolymergels StartingmaterialMonomer watersolubleoroilsolublemonomer Polymers naturalorsyntheticpolymers MixturesofmonomersandpolymersTwopremises ThemainchainorsidechainwithalargenumberofProsolventgroupsAppropriatecrosslinkingnetworkstructurePreparationmethod CrosslinkingpolymerizationofmonomersGraftcopolymerization ChemicalinitiatorRadiationtechnology Freeradicalpolymerizationorcopolymerization Monomer smartpolymergels Othercross linkingortransformation etc Olefinmonomer Covalentattachment Naturalpolymer starchcellulose anditsderivatives Applicationofpolymergel ChemicalfilmandchemicalvalveForintelligentlargemolecules theirconformationcanbechangedduetothesmallchangesintheexternalconditions andthechangemaybelostduetothedisappearanceofthechangeofexternalconditions Itisbasedonthiskindofcontrollableconformationalchangeofintelligentmacromolecule whichisdesignedandproducedavarietyofmolecularweightwhichcanbecontrolledtoseparatemembrane Forexample attheendofdisulfidebondpolyL2glutamicacidgraftedontoapolycarbonatemembraneporestructure theuseofthismoleculeinthelowpHconformationshrinkage highpHconformationstretchingcontrollingmembraneporesize ExperimentsshowthatthemembranewaterpermeabilitydependenceonthepHofthesolutionandchangesintheionicstrengthofthesolutionwillalsoaffectthewaterpermeability withtheincreaseoftheionicstrength waterpermeabilityonthepHdependencedecreases chemicalmechanicaldeviceDifferenthydrogelcomposite makingawidevarietyofchemicalmechanicaldevices Whenstimulated thesematerialscanbebentintoapredeterminedshape whenthestimulusdisappears thematerialisreturnedtotheoriginalshape Forexample thePNIPAMgelwasmodifiedatfourequallyspacedpointsonatemperatureinsensitivePAMgel Atroomtemperature thecompositematerialisshapedinastraightline butwhenthetemperaturerises compositegelinthePNIPAMmodifiedatbegantobend formingapentagonal thencontinuetobendsoastoformasquarepattern cooling reversebendingprocess materialsandrecoveryisalineartype Accordingtothis thedesignandmanufactureofthegelhandandothergeldevicecanbegrabbed Applicationofpolymergel drugcontrolreleaseTosmartpolymermaterialsasthebasis itcanmakethedrugreleasesystemintelligence drugisreleasedwhenneeded otherwisenotbereleased Thecharacteristicsofthissystemintegratingdrugsandwhetheragentsontheirownjudgment setofsensing processingandexecutivefunctioninabody itcansignalachangeintheperceiveddiseasecausedbychemicalandphysicalquantities pharmaceuticalaccordingtothisresponsetothesignalfromthefeedbackandreleasedrugorterminationoftherelease Infact thesmarttypeoflargemolecul