NMR spectroscopy of polymers

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1、CHAPTER20NMRSpectroscopyofPolymersyAlanE.Tonelli*andJefferyL.White*Fiber&PolymerScienceProgram,NorthCarolinaStateUniversity,Raleigh,NC27695yDepartmentofChemistry,OklahomaStateUniversity20.1Introduction.............................................................35

2、920.2Resonance..............................................................36020.3Nuclearspininteractionsandrelaxation....................................36020.4NMRFrequenciesandChemicalShifts.....................................36120.5SPINSPINCoupling...........

3、.........................................36220.6ExperimentalObservationofNMR........................................36320.7HighResolutionNMRofPolymers........................................36520.81HNMR..............................................................

4、..36520.913CNMR...............................................................36620.1013CNMRSpectralAssignments...........................................36820.11Two-DimensionalNMR..................................................37120.12NMRofSolidPolymers........

5、..........................................37220.13Solid-StateNMRApplicationsinPolymerScience..........................376References..............................................................38220.1INTRODUCTION
1=2.Ingeneralthereare2Iþ1possibleorientationsofm,or

6、magneticstatesofthenucleus.Theratioofthemag-Nucleiofallatomspossesschargeandmass,andfortu-neticmomenttotheangularmomentumiscalledthegyro-natelysomehaveangularmomentumandamagneticmo-magneticratio,g,ment.Nucleiwithoddmassnumbershavespinangularg¼2pm=hI(20:2)momentumq

7、uantumnumbersIthatareodd-integralmul-tiplesof1/2.Nucleiwithevenmassnumbersandoddandischaracteristicforagivennucleus(seeTable20.1).nuclearchargeshaveintegralspinI,whilethosewithevenWiththeexceptionof2H,thenucleicommontotheNMRnuclearchargearespinless.studiesofpolyme

8、rsusuallyhavespinI¼1=2,andareAnucleuswithspinIhasanangularmomentumI(h=2p),characterizedby2Iþ1¼2magneticstates,m¼þ1=2wherehisPlancksconstant.IfI6¼0,thenu