二维Ti3C2Tx材料的制备、改性及其对TPU松弛行为的影响研究

二维Ti3C2Tx材料的制备、改性及其对TPU松弛行为的影响研究摘要：

本文研究了利用水热法制备二维Ti3C2Tx材料及其对TPU松弛行为的影响。通过XRD、SEM、TEM、TGA等测试手段对所制备材料进行了表征，并测量了TPU/Ti3C2Tx复合材料的拉伸力学性能和热性能。结果表明，制备的二维Ti3C2Tx材料具有典型的MXene结构，Ti3C2Tx的晶体结构具有层间间隙，具有优异的插层能力。在复合材料中添加适量的Ti3C2Tx可以增强复合材料的强度和韧性，同时降低松弛率。复合材料的断裂面显示出Ti3C2Tx具有的层状结构，表明Ti3C2Tx与TPU之间存在相互作用。因此，二维Ti3C2Tx的制备和应用在TPU复合材料中的改性，为制备高强度、高韧性和减小TPU松弛率的新型复合材料提供了一种新的途径。

关键词：二维Ti3C2Tx；TPU；水热法；改性；松弛行为

Abstract：

Thispaperstudiesthepreparationoftwo-dimensionalTi3C2TxmaterialbyhydrothermalmethodanditsinfluenceontherelaxationbehaviorofTPU.ThematerialspreparedwerecharacterizedbyXRD,SEM,TEM,TGA,etc.,andthetensilemechanicalpropertiesandthermalpropertiesofTPU/Ti3C2Txcompositesweremeasured.Theresultsshowthatthepreparedtwo-dimensionalTi3C2TxmaterialhasatypicalMXenestructure,andthecrystalstructureofTi3C2Txhasinterlayergaps,whichhasexcellentintercalationability.AddingappropriateamountofTi3C2Txinthecompositecanenhancethestrengthandtoughnessofthecomposite,andreducetherelaxationrate.ThefracturesurfaceofthecompositematerialshowsthatTi3C2Txhasalayeredstructure,indicatingthatthereisinteractionbetweenTi3C2TxandTPU.Therefore,thepreparationandapplicationoftwo-dimensionalTi3C2TxinthemodificationofTPUcompositesprovideanewwaytopreparenewcompositeswithhighstrength,hightoughnessandreduceTPUrelaxationrate.

Keywords:two-dimensionalTi3C2Tx;TPU;hydrothermalmethod;modification;relaxationbehavioTheincorporationoftwo-dimensionalTi3C2TxintoTPUcompositesthroughthehydrothermalmethodhasshownasignificantimprovementinthemechanicalpropertiesoftheresultingmaterials.TheadditionofTi3C2TxresultedinanincreaseinthetensilestrengthandYoung’smodulusofthecomposites.ThiscanbeattributedtothestronginteractionsbetweentheTi3C2TxandTPU,whichleadtoanimprovementintheinterfacialadhesionbetweenthephases.Furthermore,thelayeredstructureofTi3C2Txalsoimpartsatougheningeffecttothematerial,whichcanbeobservedintheincreaseintheelongationatbreakofthecomposites.

TherelaxationbehavioroftheTPUcompositeswasalsofoundtobesignificantlyreducedwiththeadditionofTi3C2Tx.ThiscanbeattributedtothepresenceofthelayeredstructureofTi3C2Tx,whichactsasaphysicalbarriertothemobilityofthepolymerchains.This,inturn,leadstoadecreaseintherelaxationrateofthematerial.

ThefracturesurfaceofthecompositematerialshowedclearevidenceoftheinteractionbetweenTi3C2TxandTPU,asindicatedbythelayeredstructureoftheTi3C2Tx.Thissuggeststhatthehydrothermalmethodisaneffectivewaytoincorporatetwo-dimensionalTi3C2TxintoTPUcomposites,leadingtothepreparationofnewmaterialswithimprovedmechanicalpropertiesandreducedrelaxationbehavior.

Inconclusion,theincorporationoftwo-dimensionalTi3C2TxintoTPUcompositesthroughthehydrothermalmethodprovidesanewwaytopreparehigh-strengthandhigh-toughnessmaterialswithreducedrelaxationbehavior.ThestronginteractionbetweenTi3C2TxandTPU,aswellasthelayeredstructureofTi3C2Tx,contributetotheimprovedmechanicalpropertiesandreducedrelaxationbehaviorofthecompositesThismethodofincorporatingtwo-dimensionalTi3C2TxintoTPUcompositescanhavemanypracticalapplications,suchasintheproductionofprotectivegear,automobilepartsandsportingequipment.Thehigh-strengthandhigh-toughnesspropertiesofthesecompositescanprovidebetterprotectionagainstimpactsandimprovethedurabilityoftheseproducts.Thereducedrelaxationbehaviorcanalsoleadtolongerlifetimesoftheseproducts.

Furthermore,thisnewmethodofpreparingcompositescanalsobeappliedtootherpolymermaterials,openingupanewfieldinmaterialsscience.Thismethodcanbeadaptedtoincorporateothertwo-dimensionalmaterials,suchasgrapheneandboronnitride,withvariouspolymermatrices,leadingtoawiderangeofnovelmaterialswithenhancedmechanicalandphysicalproperties.

However,furtherresearchisneededtofullyunderstandthemechanismsbehindtheimprovedpropertiesofthesecompositesandtooptimizetheirproductionparameters.TheeffectofincorporatingdifferentconcentrationsofTi3C2TxonthepropertiesofTPUcompositesneedstobestudiedinmoredetail,aswellastheeffectofdifferentsynthesismethodsonthemechanicalandphysicalpropertiesofthecomposites.

Insummary,theincorporationoftwo-dimensionalTi3C2TxintoTPUcompositesthroughthehydrothermalmethodprovidesanewwaytopreparehigh-strengthandhigh-toughnessmaterialswithreducedrelaxationbehavior.Thismethodhaspracticalapplicationsinvariousfieldsandcanalsobeappliedtootherpolymermaterials,openingupanewfieldinmaterialsscience.FurtherresearchisrequiredtofullyoptimizetheproductionparametersandunderstandthemechanismsbehindtheimprovedpropertiesofthesecompositesInadditiontothepotentialapplicationsinvariousfields,thepreparationofTi3C2Tx/TPUcompositesthroughthehydrothermalmethodhasalsoattractedattentionduetoitssignificanceinadvancingthefundamentalunderstandingofstructure-propertyrelationshipsintwo-dimensionalmaterialsandpolymercomposites.TheincorporationofTi3C2Tx,atwo-dimensionalmaterial,intoTPU,apolymermaterial,canleadtosynergisticeffectsbetweenthetwocomponents,suchastheenhancedinterfacialinteractions,confinementeffect,anddeformationmechanisms.

ThehydrothermalmethodisasimpleandfacilemethodtoprepareTi3C2Tx/TPUcomposites.TheprocessinvolvesthehydrothermaltreatmentofTi3C2Tx,followedbythemixingofthetreatedTi3C2TxwithTPU,andthenthehot-pressingofthemixturetoformthefinalcomposite.ThehydrothermaltreatmentofTi3C2Txcanintroducehydroxylgroups,whichcanenhancethecompatibilitybetweenTi3C2TxandTPU.Thehot-pressingprocesscanprovidesufficientpressureandtemperaturetoachieveintimatecontactandinterfacialadhesionbetweenthetwocomponents.

TheincorporationofTi3C2TxintoTPUcansignificantlyimprovethemechanicalpropertiesofthecomposite.TheadditionofTi3C2Txcanleadtoasubstantialincreaseinthetensilestrengthandelongationatbreakofthecomposite.ThisenhancementcanbeattributedtothesynergisticeffectbetweenTi3C2TxandTPU,whichcanimprovetheinterfacialinteractionsandthedeformationmechanismsofthecomposite.TheconfinementeffectofTi3C2Txcanalsocontributetotheimprovementofthemechanicalproperties.

Inadditiontothemechanicalproperties,theincorporationofTi3C2Txcanalsoimpactthethermalanddynamicmechanicalpropertiesofthecomposite.ThethermalstabilityofthecompositecanbeimprovedduetothebarriereffectofTi3C2Txagainstthediffusionofoxygenandwater.Thedynamicmechanicalanalysisofthecompositecanrevealtheviscoelasticbehaviorofthematerialandthenatureoftherelaxationbehavior.

FurtherresearchisrequiredtooptimizetheproductionparametersofTi3C2Tx/TPUcompositesandtoelucidatetheunderlyingmechanismsbehindtheimprovedpropertiesofthecomposite.ThesurfacemodificationofTi3C2TxcanalsobeexploredtofurtherenhancethecompatibilitybetweenTi3C2TxandTPU.Thehydrothermalmethodcanbeextendedtoincorporateothertwo-dimensionalmaterials,suchasMXenesandgraphene,intopolymermaterials,leadingtoanewclassofmaterialswithtailoredmechanical,thermal,ande