智能材料英文

Intelligentpolymermaterials高材03班余函帥婉華MaincontentOverviewofsmartpolymermaterials1Classificationandapplicationofsmartpolymermaterials2Outlookofsmartpolymermaterials3Intelligentmaterial:Itisalsoknownassmartmaterial,whichhasthefunctionofperception,selfdiagnosis,selfadaptationandselfrepair.

Features:polymermaterialsintegratingperception,driverandinformationprocessing,toformanintelligentpropertiessimilartothebiologicalmaterial.

BiologicalfunctionoftheIntelligentmaterialsHavefeedbacksystemInformationaccumulationandrecognitionfunctionLearningabilityandpredictivefunctionResponsefunctionSelfrepairingfunctionSelfdiagnosticfunctionDynamicbalanceandadaptivefunctionAmaterialsystemwiththeformoftheabovestructure,itmaybereflectedofthefollowingcharacteristics:Withsensingcapabilities,candetecttheoutsideworld(orinternal)ofthestimulusintensityWithinformationtransferfunction,tosetuptheoptimalwaytochooseandcontrolresponseFunctionofresponseandexecutiontotheenvironmentaltransformationSensitiveresponseTheexternalstimuluscanquicklyreturntotheoriginalstate.IntelligentmaterialIntelligentmetalmaterialsIntelligentinorganicnonmetallicmaterialsIntelligentpolymermaterialsadvantangesMultilevelstructureWeakintermolecularforcesSidechainiseasytointroducefunctionalgroupsFacilitatemoleculardesignandfinecontrolEasycoatingConducivetotheperceptionoftheenvironmenttoachieveenvironmentalresponseClassificationofintelligentpolymermaterialsSmartpolymergelShapememorypolymermaterialsIntelligentpolymercompositesDefinitionofpolymergelsThegelisbetweenliquidandsolidmaterialform.Polymergelismadeupofmoleculesbetweenthree-dimensionalcrosslinkednetwork,itsnetworkconsistsofthemacromolecularmainchainandsidechainwithhydrophilicgroups(polarity)andhydrophobicgroups,or(and)dissociativegroup,solventwasfixedinthemolecularnetwork.Althoughsolventcannotbedissolvedthethreedimensionalnetworkstructureofpolymer,buthighmolecularcompoundsolventaffinitygroupspartcanthroughsolventeffectandmakethepolymerswelling,thisalsoisoneofthereasonsfortheformationofpolymergel.DefinitionofpolymergelsThreedimensionalnetworkstructureofpolymergelsThesystemofthree-dimensionalpolymernetworkandsolventSolventswelling,whichcanbesolventswellingBiggestfeature:volumephasetransitionThepolymergel,whichcanbechemicallybonded,canbechemicallyandphysicallycross-linked.ClassificationofpolymergelsAccordingtotheclassificationofsolventinthepolymernetwork:PolymergelHydrogelOrganicgelHydrogelsarethemostcommonandoneofthemostimportantpolymergels.Thevastmajorityofcreatures,thepresenceofnaturalplantgelandmanysyntheticpolymergelarebelongtothehydrogel.Andbiologicalgelhaveexcellentintelligenceandhighstrength.Intelligenthydrogelisakindofhydrogelwhichcanproducesensitiveresponsetoexternalstimuli.Hydrogelscanabsorbhundredsoftimesbeyondtheweightofwater,soitisalsousedinhealthmaterials.ClassificationofpolymergelsThevolumephasetransitionofgel:Gelequilibriumswellingvolumechangeswiththechangesoftheenvironment.SwellingphaseContractionphaseEnvironmentalfactorschangeVolumediscontinuityInternalcause:FanDehuaforce,hydrogenbond,hydrophobicinteractionandelectrostaticforce.PreparationofsmartpolymergelsStartingmaterialMonomer(watersolubleoroilsolublemonomer)Polymers(naturalorsyntheticpolymers)MixturesofmonomersandpolymersTwopremises:ThemainchainorsidechainwithalargenumberofProsolventgroupsAppropriatecrosslinkingnetworkstructurePreparationmethod:CrosslinkingpolymerizationofmonomersGraftcopolymerizationChemicalinitiatorRadiationtechnologyFreeradicalpolymerizationorcopolymerizationMonomersmartpolymergelsOthercross-linkingortransformation,etc.OlefinmonomerCovalentattachmentNaturalpolymer(starchcellulose)anditsderivativesApplicationofpolymergelChemicalfilmandchemicalvalveForintelligentlargemolecules,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.ApplicationofpolymergeldrugcontrolreleaseTosmartpolymermaterialsasthebasis,itcanmakethedrugreleasesystemintelligence,drugisreleasedwhenneeded,otherwisenotbereleased.Thechar