NMR-STUDY OF ORDERING IN LIQUID-CRYSTALLINE SOLUTION OF POLYBENZYLGLUTAMATE OF VARIOUS MOLECULAR-MASS

H-1 and H-2 NMR spectra of fractionated poly-gamma-benzyl-L-glutamate solutions are recorded at various temperatures. NMR signals of both th ese nuclei of solvent molecules ( mixture of CD2Cl2 and CH2Cl2) appear to be doublets. Their splitting (30-130 Hz for protons and 200-600 Hz for deuterons) reduces when the polymer molecular mass grows. As the splitting is proportional to degree of orientation of solvent and solu te molecules, it means that longer macromolecules are less oriented th an shorter ones. One can explain such behavior in terms of persistent chain model, since the bended rods of less length can be better orient ed along the director.