Method for Combinatorial Screening of Moisture Vapor Transmission Rate

Autor:	and Abigail B. Nugent, Ali Mehrabi, Aaron Chavira, Jaime C. Grunlan, Dennis Saunders
Rok vydání:	2003
Předmět:	Absorbance Absorption of water Moisture Chemistry Emulsion Analytical chemistry medicine Relative humidity General Chemistry Chloride Moisture vapor transmission rate medicine.drug
Zdroj:	Journal of Combinatorial Chemistry. 5:362-368
ISSN:	1520-4774 1520-4766
DOI:	10.1021/cc020112h
Popis:	A high-throughput method for screening the moisture vapor transmission rate of barrier films was developed. This moisture high-throughput screening (MHTS) technique is based upon a Nafion-crystal violet (CVN) sensor that changes color from yellow to green upon absorption of water. Using an appropriate set of known standards, the slope of absorbance (at 630 nm) as a function of time can be converted into moisture vapor transmission rate (MVTR) values that agree with those obtained using ASTM F1290. High-throughput screening was demonstrated by depositing 20 emulsion-based poly(vinylidene chloride) films, using a 48-well template, of varying thicknesses onto the CVN sensor film and aging at 40 degrees C and 90% relative humidity for 72 h. MVTR values were accurately determined to a level of 0.9 g/m(2).day, at which point side-diffusion of moisture between the barrier and sensor films prevented observation of lower values. Larger sample size and edge-sealing are two proposed methods for improving the sensitivity of MHTS.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bebd03f19cec6273bd7d7fedad8c0a9e https://doi.org/10.1021/cc020112h Zobrazit plný text záznamu