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Polarizer effect and structure of iodinated before and after casting poly(vinyl alcohol) film
Author(s) -
Shin Eun Joo,
Lyoo Won Seok,
Lee Yang Hun
Publication year - 2010
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/app.33162
Subject(s) - boric acid , vinyl alcohol , materials science , casting , iodine , aqueous solution , durability , ion , polymer chemistry , composite material , chemical engineering , chemistry , organic chemistry , polymer , metallurgy , engineering
Abstract Poly(vinyl alcohol) (PVA)/iodine polarizing film was manufactured as follows: PVA iodinated in solution before casting (IBC film) and iodinated again after casting (IBC + IAC film) and then the IBC + IAC film was drawn in boric acid aqueous solution (IBC + IAC polarizing film), to improve the durability of the polarizing film under a humid and warm atmosphere. These effects were examined by investigating the structural and optical properties of the IBC, IBC + IAC, and IBC + IAC polarizing films. In the IBC state, the PVA chain segments that combined boric acid and iodine were regarded as defects of the crystal, the formation of I 3 − decreased with respect to weight gain of boric acid. In the IBC + IAC state, the strength of the peak corresponding to I 3 − decreased and the I 5 − peak increased. The iodine ions penetrated into crystal of the IBC state during the IAC process and formed a new PVA/iodine complex crystal at the 2θ = 20° in the X‐ray diffraction curves. In the IBC + IAC polarizing film state, another type of polarizing film (IBC + IAC polarizing film‐H) containing I 3 − ions mainly was manufactured as well as the IBC + IAC polarizing film to compare the effects of the I 3 − and I 5 − ions on the durability of the polarizing films. The durability of the I 3 − ions that were complexed with the PVA chain was higher than the I 5 − ions, which could possibly be separated to I 3 − and I 2 . © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010