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Electronic and optical properties of wet‐spun films of Li‐ and Na‐hyaluronate
Author(s) -
Lee S. A.,
Vansteenberg M. L.,
Lavalle N.,
Rupprecht A.,
Song Z.
Publication year - 1994
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.360341112
Subject(s) - polarizability , chemistry , molar absorptivity , refractive index , absorption (acoustics) , molecule , analytical chemistry (journal) , absorption of water , swelling , optics , organic chemistry , chemical engineering , composite material , physics , materials science , engineering
The uv absorption of Na‐hyaluronate (NaHA) films and the refractive indices, water content, and swelling of LiHA films have been measured as a function of relative humidity. Three peaks are observed in the uv absorption of NaHA (at about 250, 310, and 330 nm) for water content above 10 water molecules per disaccharide. The absorptivity of the 250, 310, and 330 nm peaks increase as the water content increases, indicating a change in the electronic properties of the HA molecule. The refractive indices, water content, and swelling of LiHA films are used to determine the optical polarizability via the Lorentz–Lorenz relation. The polarizability of LiHA is found to have a similar dependence on water content as NaHA, though the changes observed are larger in magnitude. © 1994 John Wiley & Sons, Inc.