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Physical Gels Based on Polyrotaxanes: Kinetics of the Gelation, and Relative Contributions of alpha-Cyclodextrin and Poly(ethylene oxide) to the Gel Cohesion

dc.rights.licenseopen
hal.structure.identifierEcole nationale supérieure de chimie, polymères et materiaux de strasbourg (ECPM)
dc.contributor.authorTRAVELET, Christophe
hal.structure.identifierEcole nationale supérieure de chimie, polymères et materiaux de strasbourg (ECPM)
dc.contributor.authorSCHLATTER, Guy
dc.contributor.authorHEBRAUD, Pascal
hal.structure.identifierLaboratoire de Chimie des Polymères Organiques [LCPO]
hal.structure.identifierTeam 4 LCPO : Polymer Materials for Electronic, Energy, Information and Communication Technologies
dc.contributor.authorBROCHON, Cyril
dc.contributor.authorANOKHIN, Denis V.
dc.contributor.authorIVANOV, Dimitri A.
hal.structure.identifierLaboratoire de Chimie des Polymères Organiques [LCPO]
hal.structure.identifierTeam 4 LCPO : Polymer Materials for Electronic, Energy, Information and Communication Technologies
dc.contributor.authorHADZIIOANNOU, Georges
dc.date.accessioned2020
dc.date.available2020
dc.date.created2010
dc.date.issued2010
dc.identifier.issn1022-1360
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/20507
dc.description.abstractEnPolyrotaxanes (PRs) based on alpha-cyclodextrins (alpha-CDs) threaded onto 22 kg mol(-1) poly(ethylene oxide) (PEO) chains in concentrated solution in dimethyl sulfoxide (DMSO) showed the particularity to form physical gels when resting at 21 degrees C. The wide range of studied degrees of complexation N (from 7 up to 176), where N is the number of threaded alpha-CDs per PEO chain, allowed to better understand the molecular origin of the physical gelation. The non-monotonous evolution of the mechanical properties of the gels with the complexation degree can be attributed to the crystallization of naked PEO segments and the aggregation of alpha-CDs. In fact, differential scanning calorimetry measurements carried out on these physical gels showed two distinct endothermic peaks. The first peak at 29.4 degrees C was attributed to the crystals of naked PEO segments (the parts of the PR molecule not covered by alpha-CDs). The second peak at 32.0 degrees C was attributed to alpha-CD aggregates. The dissolution enthalpy of the low temperature peak decreased monotonously with increasing N and the dissolution enthalpy of the high temperature peak increased monotonously with increasing N. These results were confirmed using X-ray scattering and (1)H NMR spectroscopy measurements showing these two contributions to gelation. These results showed that the cohesion of the physical gel was due to the crystallization of naked PEO segments, on the one hand, and, on the other hand, to the regular aggregation of alpha-CDs driven by intra- and inter-molecular hydrogen bonding interactions of their hydroxyl groups.
dc.language.isoen
dc.publisherWiley-VCH Verlag
dc.subject.encrystallization
dc.subject.enassociation
dc.subject.ensupramolecular structures
dc.subject.enpolyrotaxanes
dc.subject.engels
dc.title.enPhysical Gels Based on Polyrotaxanes: Kinetics of the Gelation, and Relative Contributions of alpha-Cyclodextrin and Poly(ethylene oxide) to the Gel Cohesion
dc.typeArticle de revue
dc.identifier.doi10.1002/masy.201050524
dc.subject.halChimie/Polymères
bordeaux.journalMacromolecular Symposia
bordeaux.page202-211
bordeaux.volume291-292
bordeaux.hal.laboratoriesLaboratoire de Chimie des Polymères Organiques (LCPO) - UMR 5629*
bordeaux.institutionBordeaux INP
bordeaux.institutionUniversité de Bordeaux
bordeaux.peerReviewedoui
hal.identifierhal-00679973
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00679973v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Macromolecular%20Symposia&rft.date=2010&rft.volume=291-292&rft.spage=202-211&rft.epage=202-211&rft.eissn=1022-1360&rft.issn=1022-1360&rft.au=TRAVELET,%20Christophe&SCHLATTER,%20Guy&HEBRAUD,%20Pascal&BROCHON,%20Cyril&ANOKHIN,%20Denis%20V.&rft.genre=article


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