Nmr-Study of Segregation by Molecular Mass in A Polydisperse Nematic Polymer

Using proton and deuterium NMR we show that in polydisperse nematic polyesters with mesogenic units in the main chain: (i) in the nematicisotropic biphase, the nematic phase is enriched with the longest species and (ii) in the nematic phase itself there is additional segregation by molecular mass into nematic domains.