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Polarized and depolarised light scattering on solutions of cellulose in N , N ‐dimethylacetamide/lithium chloride
Author(s) -
Röder Thomas,
Morgenstern Bernd,
Glatter Otto
Publication year - 2000
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 - 10.1002/1521-3900(200012)162:1<87::aid-masy87>3.0.co;2-7
Subject(s) - dimethylacetamide , lithium chloride , dynamic light scattering , light scattering , rotational diffusion , materials science , analytical chemistry (journal) , dispersion (optics) , cellulose , scattering , size exclusion chromatography , solvent , chemistry , optics , chromatography , inorganic chemistry , molecule , organic chemistry , nanoparticle , nanotechnology , physics , enzyme
In the present work, the common solvent system N,N‐dimethylacetamide (DMAc)/LiCl was studied which is used, e.g. , for the determination of the molecular weight distribution of cellulosic substrates by size exclusion chromatography (SEC). Results of dynamic light scattering (DLS) experiments in the concentration range employed in SEC are presented, and discussed in terms of the solution state. A molecular dispersion of cellulose was found. The influence of the salt concentration on the solution state was shown. In solutions of higher concentrations (> 2% pulp, 6% LiCl) anisotropic particles were found which were further investigated by depolarized dynamic light scattering (DDLS). The particle size was determined by estimating the translational and rotational part of diffusion. These particles can be described as oblate rotational ellipsoids. The axial ratio ρ was found to be 5/4. The half axis a was found to be 425 nm and the half axis b 530 nm.