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Matrix-assisted laser desorption ionization (MALDI) is a powerful analytical technique used in mass spectrometry. It enables the identification and characterization of various biomolecules, including proteins, peptides, nucleic acids, and carbohydrates. MALDI is an ionization technique, widely employed in biological and medical research, as well as in fields like pharmacology and biochemistry.The analyte of interest, a biomolecule or a mixture of biomolecules, is mixed with a suitable matrix...
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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Syntheses, Crystallization, and Spectroscopic Characterization of 3,5-Lutidine N-Oxide Dehydrate
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Solvent-Assisted Desorption of 2,5-Lutidine from Polyurethane Films.

Devon A Boyne1, Mark J Varady2, Robert H Lambeth3

  • 1Leidos , 11951 Freedom Drive, Reston, Virginia 20190, United States.

The Journal of Physical Chemistry. B
|February 9, 2018
PubMed
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Solvent-assisted desorption of 2,5-lutidine from polyurethane was enhanced by both protic and aprotic solvents. Aprotic solvents showed a significantly faster penetrant extraction rate due to reduced polymer chain interaction.

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Area of Science:

  • Polymer science
  • Chemical engineering
  • Materials science

Background:

  • Understanding chemical transport in polymers is crucial for developing advanced materials like membranes and coatings.
  • Optimizing decontamination formulations requires knowledge of chemical interactions and desorption mechanisms.

Purpose of the Study:

  • To investigate the solvent-assisted desorption of a penetrant (2,5-lutidine) in polyurethane using protic (methanol) and aprotic (acetonitrile) solvents.
  • To characterize the chemical interactions influencing penetrant desorption using time-resolved Fourier transform infrared spectroscopy (FTIR).

Main Methods:

  • Utilized time-resolved Fourier transform infrared spectroscopy (FTIR) to monitor chemical interactions during desorption.
  • Exposed polyurethane to single and multicomponent solvent systems involving 2,5-lutidine, methanol, and acetonitrile.
  • Analyzed FTIR spectra to identify mechanisms of enhanced penetrant desorption.

Main Results:

  • Both protic and aprotic solvents increased the penetrant extraction rate from polyurethane.
  • Identified two primary mechanisms: competition for polymer hydrogen donors and disruption of polymer chain cohesive forces.
  • Aprotic solvents demonstrated an order of magnitude higher desorption rate compared to protic solvents.

Conclusions:

  • Solvent choice significantly impacts penetrant desorption rates from polymers.
  • Aprotic solvents are more effective due to greater disruption of polymer self-interactions and reduced complex formation.
  • Findings provide insights for designing efficient membranes, coatings, and decontamination strategies.