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Intrinsic Self-healing of Covalent Polymers Based on Alkoxyamines Units

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關鍵詞：

intrinsic self-healing covalent polymers alkoxyamines units

資料大小：

110K

所屬學科：

分子表征

來源：

第六屆亞歐研討會上處理和性能增強聚合物會議文集（2013.6.2-6 武漢）

簡介：

Cracksinintrinsicself-mendingpolymerscanbehealedasaresultofcrossoverinterconnectionofreversiblecovalentbondsatthebrokenfaces.Typicalreversiblecovalentbondsservedasbasisforself-healingofstructuralmaterialsareDiels-Alder(DA)interactions[l].Generally,re-mendingofhardsolidmaterialexhibitinggoodmechanicalpropertiesatroomtemperaturehastobeheatedaboveitsTgforfacilitatingmolecularmovementandmass(monomer)transportationtodamagedareas.Thismendingprocesswouldinevitablydistortmaterial‘sshapeasaresultofmolecularcleavageanddrasticallyincreasedeformabilityduetoglasstransition[2].Itisworthnotingthatdistortionofend-useproductsisnotallowedforstructuralapplicationswheremechanicalstrengthpropertiesarecriticalevenifself-healingisproceeding.Tosolvethisproblem,weintroduceanovelhealingmechanismbyemployingalkoxyaminemoietiesasintermolecularlinkstocrosslinkpolystyrene,polyurethaneandepoxy.Uponheatingtocertainhomolysistemperature,covalentC-ONbondfissionandradicalrecombinationsynchronouslytakeplaceamongalkoxyaminemoieties.Crackedpartswerethusreconnectedrepeatedlyinasingle-stepfashion(ratherthanthetwo-steponeinthecaseofDAreaction),withoutlosingintegrityandloadbearingabilityofthematerialevenaboveTg.Moreover,thehealingcanbeconductedwithinawidetemperaturerangebytailoringthespatialandelectroniceffectsofalkoxyaminesunits.Itisfoundthatthespecialdesignedpolymerscanrepeatedlyself-healcrackswithoutdeformationinducedbychainscission,andprovidethepolymerwithmechanicalstabilityatelevatedtemperatureaswell.Molecularstructuresofalkoxyaminesmoieties,aswellasthermodynamicbehaviorofC-ONbondsscissionandrecombination,etc.,arestudiedindetailstooptimizeself-healingbehaviorofthepolymers.

作者：

M. Z. Rong, M. Q. Zhang, C. E. Yuan

上傳時間：

2013-06-26 13:32:38

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