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Role of molecular weight of atactic poly(vinyl alcohol) (PVA) in the polarizing efficiency of PVA/azo dye complex film with high durability
Author(s) -
Lyoo Won Seok,
Yeum Jeong Hyun,
Park Joo Min,
Kwak Jin Woo,
Kim Joon Ho,
Kim Sam Soo,
Ji Byung Chul,
Noh Seok Kyun
Publication year - 2005
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.20642
Subject(s) - vinyl alcohol , materials science , polymer chemistry , relative humidity , diad , saponification , tacticity , chemical engineering , transmittance , composite material , polymerization , polymer , copolymer , organic chemistry , chemistry , physics , optoelectronics , engineering , thermodynamics
To precisely identify the effect of molecular weight of atactic poly(vinyl alcohol) ( a ‐PVA) on the durability and polarizing efficiency (PE) of a ‐PVA/dye polarizing film, we prepared two ( a ‐PVA)s with similar syndiotactic diad contents of 54.0%, degrees of saponification of 99.9%, and with different number‐average degrees of polymerization [( P n )s] of 1700 and 4000, respectively. Through a series of experiments, it was found that molecular weight of a ‐PVA had a significant influence on the durability of a ‐PVA/dye film in heat and humidity conditions (relative humidity of 80% and temperature of 90°C). That is, both desorption of dye in a ‐PVA/dye film and transmittance of film decreased with increasing molecular weight of PVA. The change of PE (durability) of a ‐PVA/dye film in heat and humidity conditions was limited to about below 5%. The change of PE of PVA/dye film having P n of 4000 especially was limited to 1%, whereas that of a ‐PVA/iodine film with P n of 4000, was almost 80% under the same condition. Also, transmittance of the drawn a ‐PVA/dye film was far higher than that of the undrawn one. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 967–974, 2005