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Measurement of concentration profiles using confocal Raman spectroscopy in multicomponent polymeric coatings-model validation

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Title Measurement of concentration profiles using confocal Raman spectroscopy in multicomponent polymeric coatings-model validation
 
Creator ARYA, RK
VINJAMUR, M
 
Subject coatings
diffusion
Raman spectroscopy
thin films
INVERSE GAS-CHROMATOGRAPHY
SOLVENT-SOLVENT SYSTEMS
FREE-VOLUME THEORY
DRY-CAST PROCESS
DIFFUSION-COEFFICIENTS
MEMBRANE FORMATION
MOLECULAR-WEIGHT
SELF-DIFFUSION
FILMS
TEMPERATURE
 
Description Concentrations of the solvents were measured using confocal laser Raman Spectroscopy for two ternary systems, poly(styrene)tetrahydrofuranp-xylene and poly(methyl methacrylate)ethylbenzenetetrahydrofuran, during drying at room temperature. The concentrations were compared with predictions of drying models, which utilize several existing theories for mutual diffusion coefficients for polymer solvent systems. Of the nine free volume parameters required to predict diffusion coefficients of binary systems, four for each of the four pairs studied here were estimated as suggested by the literature. Estimation was done by minimizing the difference between predictions of the model and experimental weight loss data for each binary pair. It is found that the predictions of the models which include cross term diffusion coefficients are in better agreement with measured concentrations than those which ignore the cross terms. (c) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
 
Publisher WILEY-BLACKWELL
 
Date 2014-10-17T05:33:23Z
2014-10-17T05:33:23Z
2013
 
Type Article
 
Identifier JOURNAL OF APPLIED POLYMER SCIENCE, 128(6)3906-3918
http://dx.doi.org/10.1002/app.38589
http://dspace.library.iitb.ac.in/jspui/handle/100/16077
 
Language en