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Interaction between iodine and ethyl cellulose
Author(s) -
Wang Yang,
Easteal Allan J.
Publication year - 1999
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19990222)71:8<1303::aid-app10>3.0.co;2-t
Subject(s) - ethyl cellulose , differential scanning calorimetry , iodine , cellulose , iodide , chemistry , aqueous solution , membrane , liquid crystal , polymer chemistry , materials science , inorganic chemistry , organic chemistry , polymer , biochemistry , physics , optoelectronics , thermodynamics
Interaction between iodine and ethyl cellulose was investigated by immersing ethyl cellulose membranes in aqueous iodine–iodide solution (iodine doping) and incorporating iodine in the solution from which the membrane was cast. Oxygen and nitrogen permeabilities in iodine‐doped ethyl cellulose decrease with an increase in the concentration of iodine in the dopant solution up to 0.003 mol L −1 and increase sharply at higher iodine concentrations, and ultraviolet–visible and far‐infrared spectra indicate formation of a charge transfer complex. Differential scanning calorimetry of both types of membrane shows changes in the characteristic phase transitions of ethyl cellulose after iodine treatment, including the crystal–liquid crystal transition that has been reported to occur in ethyl cellulose. Further evidence for liquid crystal phases has been found from circular dichroism. X‐ray photoelectron spectroscopy of iodine‐doped ethyl cellulose films indicates that the iodine is present in two different chemical states, probably l − 3and l 2 . © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 1303–1314, 1999