Premium
Ideality of pressure‐sensitive paint. III. Effect of the base‐coat permeability on the luminescence behavior of the sensing layer
Author(s) -
Gouin Sébastien,
Gouterman Martin
Publication year - 2000
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 - 10.1002/1097-4628(20000923)77:13<2815::aid-app3>3.0.co;2-j
Subject(s) - luminescence , coat , permeability (electromagnetism) , materials science , layer (electronics) , composite material , base (topology) , chemistry , optoelectronics , mathematics , membrane , biochemistry , mathematical analysis
The response time and temperature dependence of a pressure‐sensitive paint (PSP) based on platinum tetra(pentafluorophenyl)porphine (PtTFPP) in the fluoroacrylic polymer FIB significantly increases for bilayer paint systems that include a base coat made of different polymers with solid TiO 2 added as scattering agent, compared to the single‐layer sensor paint. The temperature dependencies at vacuum are the same in the various bilayer coatings (paint/base coat) as compared to monolayer paint, roughly −0.53%/ o C. With FIB base coat the percent of TiO 2 is adjusted to reduce photodegradation, in which case only a slight increase in response time (0.6 → 0.8 s) is caused by the base coat and there is almost no change in temperature dependence at 1 atm. However, in the cases of the less permeable polymers, poly(methylmethacrylate) (PMMA) and poly(vinyl acetate) (PVA), there is increased response time of the bilayer coating (rising, respectively, to 15 and 7 s) and significantly greater temperature dependence at 1 atm. The highly impermeable polyacrylonitrile (PAN) as base coat shows little effect on response time but a somewhat higher temperature dependence at 1 atm compared to vacuum. For the highly permeable polydimethylsiloxane (PDMS), adjustment of the TiO 2 concentration is needed to prevent an increase in temperature dependence but both PDMS base coats tested have response times < 2 s and low‐temperature dependence. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 2815–2823, 2000