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固体核磁共振研究半晶聚-3-羟基丁酸酯和聚羟基丁酸戊酸酯的分子动力学（英文）.docx

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固体核磁共振研究半晶聚-3-羟基丁酸酯和聚羟基丁酸戊酸酯的分子动力学（英文） Title:Solid-StateNMRStudyoftheMolecularDynamicsofSemi-CrystallinePoly(3-hydroxybutyrate-co-3-hydroxyvalerate)andPoly(3-hydroxybutyrate-co-3-hydroxyvalerate) Abstract: Solid-statenuclearmagneticresonance(NMR)spectroscopyisapowerfultechniqueforinvestigatingthemoleculardynamicsofpolymersindifferentstates,includingsemi-crystallinematerials.Inthispaper,wepresentadetailedanalysisofthemoleculardynamicsofsemi-crystallinepoly(3-hydroxybutyrate-co-3-hydroxyvalerate)(PHBV3)andpoly(3-hydroxybutyrate-co-3-hydroxyvalerate)(PHBV5)usingsolid-stateNMRspectroscopy.Thesebiodegradablepolymershaveshownpromisingapplicationsinvariousfields,includingpackaging,biomedicalimplants,andtissueengineering.Understandingtheirstructuralanddynamicpropertiesiscrucialfortailoringtheirpropertiesforspecificapplications. Introduction: Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)isabiopolymersynthesizedbymicroorganismsforenergystorageandenvironmentaladaptability.Itssemi-crystallinenatureandmechanicalpropertiesmakeitanexcellentcandidateforvariousapplications.However,therelationshipbetweenitsmolecularstructureandmacroscopicpropertiesisnotwellunderstood.Inthisstudy,solid-stateNMRspectroscopyisemployedtoelucidatethemoleculardynamicsofthesepolymersandthecorrelationwiththeircrystallineandamorphousphases. Methodology: PHBV3andPHBV5sampleswerepreparedusingasolventcastingmethod.Thesampleswerecharacterizedusingsolid-stateNMRspectroscopywithdifferenttechniques,includingmagicanglespinning(MAS)NMR,cross-polarization,andspin-latticerelaxationmeasurements.TheNMRparameterswereobtainedtoanalyzethemoleculardynamicsandmotionalprocesses. ResultsandDiscussion: Solid-stateNMRexperimentsrevealdistinctspectralfeaturesforthecrystallineandamorphousregionsofbothPHBV3andPHBV5.Theobservedresonancesareattributedtothedifferentcarbonchemicalenvironmentsandmotionswithinthematerial.Theanalysisofthesolid-stateNMRspectraprovidesinsightsintothemolecularpacking,intermolecularinteractions,andchaindynamicsw