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1、Topic,AggregationandcharacterizationofnaturalpolymersNaturalpolymersarepolymersfoundinnaturalorganisms・Asthebasisoflifeincludingprotein;nucleicacidexistsinlivingcellsofplantsandanimals;polysaccharidesandmicroorganisms:plantlignin;naturalrubberinthepresenceoflacquerandlacquer;ma
2、rinechitin,algaeetc・・First,thepurpose,significanceandresearchtrendsathomeandabroad:(1)purposeandsignificanceofresearch1,thepurposeofthestudyistostudythemolecularchainstructureofnaturalpolymer,theinteractionbetweenmolecules,molecularmotion,condensedmolecularstructure,thehierarch
3、icalstructureinfluenceonthemacroscopicpropertiesofpolymerandcharacterizationofthepolymeranditspropertiesofpolymers・Thestudyofcondensedmatterofpolymersisoneoftheimportantfieldsinpolymerphysics,andthispartbelongstocondensedmatterCategory.2、researchsignificance・Studyingthestructur
4、eandcharacterizationmethodsofnaturalpolymeraggregatescanimproveandimprovetheopticalandmechanicalpropertiesofmaterials,andcontributetothestudyofnewmaterials・Forexample,thepreparationofliquidcrystallinepolymersbythemodificationofnaturalpolymerswithcelluloseandchitin.(two)research
5、trendsathomeandabroadCondensedpolymerphysicsinvolvesphysics,chemistry,interdisciplinarymaterials,sincethe1991FrenchscientistP.G.deGenneswontheNobelprizeinthisfieldhasbeenpaidattention,inrecentyears,newdevelopmentpeak・However,thedomesticresearchinthisfieldisstilllacking・Two.Main
6、researchcontents,(1)background:whenmanylong-chainpolymersareaggregatedintopolymers,thestatesofmoleculesarestackedandarranged(inphysics,theaggregationofmoleculesiscalledcondensedmatter)・Inmanycases,theaggregationofmolecularchainsinpolymersisthermodynamical1ynonequilibrium.Manypr
7、opertiesofpolymermaterials(suchasmechanicalproperties)dependgreatlyontheaggregationstateofpolymersandtheconnectionbetweenmolecularchainsinvariousstructuralunits・Asearlyas1920s,Xraydiffractionstudiesshowedthatinsomenaturalpolymers,thearrangementofmolecularchainshadamicrocrystall
8、ineorderedstructure・The40、50s,andgraduallyrealizethatp
