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Maxwell–Stefan diffusion coefficient model derived from entropy generation minimization principle for binary liquid mixtures. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2019.06.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Varady MJ, Boyne DA, Pearl TP, Lambeth RH, Mantooth BA. Composition-dependent multicomponent diffusivity of 2,5-lutidine with acetonitrile in polyurethane. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.121697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Varady MJ, Knox CK, Cabalo JB, Bringuier SA, Pearl TP, Lambeth RH, Mantooth BA. Molecular dynamics study of competing hydrogen bonding interactions in multicomponent diffusion in polyurethanes. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.02.039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Boyne DA, Varady MJ, Lambeth RH, Eikenberg JH, Bringuier SA, Pearl TP, Mantooth BA. Solvent-Assisted Desorption of 2,5-Lutidine from Polyurethane Films. J Phys Chem B 2018; 122:2155-2164. [PMID: 29420032 DOI: 10.1021/acs.jpcb.7b10656] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A fundamental understanding of chemical interactions and transport mechanisms that result from introducing multiple chemical species into a polymer plays a key role in the development and optimization of membranes, coatings, and decontamination formulations. In this study, we explore the solvent-assisted desorption of a penetrant (2,5-lutidine) in polyurethane with aprotic (acetonitrile) and protic (methanol) solvents. Chemical interactions between solvent, penetrant, and polymer functional groups are characterized via time-resolved Fourier transform infrared spectroscopy (FTIR) during single and multicomponent exposures. For both solvents, an increase in the extraction rate of the penetrant is observed when the solvent is applied during desorption. Inspection of the FTIR spectra reveals two potential mechanisms that facilitate the enhanced desorption rate: (1) penetrant/solvent competition for hydrogen donor groups on the polymer backbone and (2) disruption of the self-interaction (cohesive forces) between neighboring polymer chains. Finally, the aprotic solvent is found to generate an order of magnitude greater desorption rate of the penetrant, which is attributed to a greater disruption of the self-interaction during penetrant desorption compared to the protic solvent and the inability of an aprotic solvent to form larger and potentially slower penetrant-solvent complexes.
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Affiliation(s)
- Devon A Boyne
- Leidos , 11951 Freedom Drive, Reston, Virginia 20190, United States
| | - Mark J Varady
- U.S. Army Edgewood Chemical Biological Center , 5183 Blackhawk Road, Aberdeen Proving Ground, Aberdeen, Maryland 21010-5424, United States
| | - Robert H Lambeth
- U.S. Army Research Laboratory , Aberdeen Proving Ground, Aberdeen, Maryland 21005, United States
| | - Janlyn H Eikenberg
- U.S. Army Edgewood Chemical Biological Center , 5183 Blackhawk Road, Aberdeen Proving Ground, Aberdeen, Maryland 21010-5424, United States
| | - Stefan A Bringuier
- DCS Corporation , 100 Walter Ward Boulevard, Suite 100, Abingdon, Maryland 21009, United States
| | - Thomas P Pearl
- DCS Corporation , 100 Walter Ward Boulevard, Suite 100, Abingdon, Maryland 21009, United States
| | - Brent A Mantooth
- U.S. Army Edgewood Chemical Biological Center , 5183 Blackhawk Road, Aberdeen Proving Ground, Aberdeen, Maryland 21010-5424, United States
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