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NMR study of ordering in liquid crystalline solution of polybenzylglutamate of various molecular mass
Author(s) -
Khachaturov A. S.,
Koltsov A. I.,
Roth H.,
Shabsels B. M.
Publication year - 1995
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19950940121
Subject(s) - deuterium , solvent , macromolecule , polymer , molecule , molecular mass , materials science , nmr spectra database , proton nmr , rod , mass spectrum , spectral line , liquid crystal , crystallography , chemistry , mass spectrometry , stereochemistry , organic chemistry , physics , chromatography , nuclear physics , biochemistry , optoelectronics , astronomy , enzyme , medicine , alternative medicine , pathology
1 H and 2 H NMR spectra of fractionated poly‐γ‐benzyl‐L‐glutamate solutions are recorded at various temperatures. NMR signals of both these nuclei of solvent molecules (mixture of CD 2 Cl 2 and CH 2 Cl 2 ) 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 solute molecules, it means that longer macromolecules are less oriented than shorter ones. One can explain such behavior in terms of persistent chain model, since the bended rods of less length can be better oriented along the director.