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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..............................................................38220.1INTRODUCTION1=2.Ingeneralthereare2It1possibleorientationsofm,or
6、magneticstatesofthenucleus.Theratioofthemag-Nucleiofallatomspossesschargeandmass,andfortu-neticmomenttotheangularmomentumiscalledthegyro-natelysomehaveangularmomentumandamagneticmo-magneticratio,g,ment.Nucleiwithoddmassnumbershavespinangularg?2pm=hI(20:2)momentumq
7、uantumnumbersIthatareodd-integralmul-tiplesof1/2.Nucleiwithevenmassnumbersandoddandischaracteristicforagivennucleus(seeTable20.1).nuclearchargeshaveintegralspinI,whilethosewithevenWiththeexceptionof2H,thenucleicommontotheNMRnuclearchargearespinless.studiesofpolyme
8、rsusuallyhavespinI?1=2,andareAnucleuswithspinIhasanangularmomentumI(h=2p),characterizedby2It1?2magneticstates,m?t1=2wherehisPlancksconstant.IfI6?0,thenu
