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Real-time monitoring of diffusion in polymer films using fluorescent tracer

โœ Scribed by V. V. Krongauz; W. F. Mooney III; J. W. Palmer; J. J. Patricia

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
545 KB
Volume
56
Category
Article
ISSN
0021-8995

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โœฆ Synopsis

A method for real-time nondestructive monitoring of small molecules diffusion in polymeric films was developed. The method was based on detection of a fluorescent tracer eluting from the investigated polymer film into the solution in which this film was immersed. The kinetics of the tracer elution, monitored by the increase in solution fluorescence intensity, was used to deduce tracer diffusivity in polymer film. The data were treated using a straightforward mathematical model, describing diffusion from an infinite plane of a certain thickness immersed into a finite solvent bath. Fluorescent 7-diethylamino-4-methyl coumarin was used as a tracer. The diffusion of this tracer within plasticized poly(methy1 methacrylate) and styrene-isoprene-styrene block copolymer matrices was monitored. The diffusion coefficients equal to 2 X lo-' cm2/s and 1 X lo-' cm2/s, respectively, were obtained.

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## Abstract Many speciality organic chemical products, such as pharmaceuticals are crystals that exhibit multiple morphological forms and habits that are of critical importance not only to the end use properties of the products, but also to their downstream processing, such as in filtration and han