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Surfactant‐free thermochromic hydrogel system: PVA/borax gel networks containing pH‐sensitive dyes
Author(s) -
Chung Woo Young,
Lee Sang Min,
Koo Sang Man,
Suh Dong Hack
Publication year - 2003
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.13272
Subject(s) - bromothymol blue , phenolphthalein , borax , thermochromism , polyvinyl alcohol , bromophenol blue , self healing hydrogels , polymer chemistry , pulmonary surfactant , aqueous solution , bromocresol green , materials science , chemical engineering , chemistry , organic chemistry , composite material , chromatography , raw material , engineering
Abstract The well‐known pH‐indicators, phenolphthalein and bromothymol blue, exhibit an outstanding thermochromism, when they are embedded in aqueous polyvinyl alcohol/borax gel networks. The color of phenolphthalein in hydrogels changes gradually from colorless at 20°C to dark red at 70°C. The pH change in a hydrogel system was from 8.0 to 8.9 with increasing temperature. In the case of bromothymol blue, the color was optically clear green at room temperature and changed to clear blue with increasing temperature. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 890–893, 2004