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Dextran‐Based Polycations: Thermodynamic Interaction with Water as Compared With Unsubstituted Dextran, 1 – Volumetric Properties and Light Scattering
Author(s) -
Morariu Simona,
Eckelt John,
Wolf Bernhard A.
Publication year - 2011
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201100196
Subject(s) - dextran , extrapolation , polymer , aqueous solution , chemistry , scattering , thermodynamics , thermodynamic equilibrium , polymer chemistry , chromatography , organic chemistry , optics , physics , mathematical analysis , mathematics
Dextran and random dextran‐based copolymers containing different molar fractions f of charged units are studied in aqueous solution and in the pure state. The specific volumes of the solutions decrease linearly with increasing weight fraction of the polymer. Extrapolation to the pure state yields information on the hypothetical liquid polymers, exhibiting a pronounced minimum at f ≈ 0.1. A similar dependence is also observed for the pure solid polymers; however, the specific volumes at low f are considerably larger and at high f are slightly smaller. These differences are discussed in terms of the non‐equilibrium structures formed during sample preparation. The thermal expansivities of the solutions pass through a maximum at f ≈ 0.1. Light scattering shows that the thermodynamic quality of water has a minimum at f ≈ 0.1.