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Type: Artigo de periódico
Title: Real-time Monitoring Of The Progress Of Polymerization Reactions Directly On Surfaces At Open Atmosphere By Ambient Mass Spectrometry.
Author: Nørgaard, Asger W
Vaz, Boniek G
Lauritsen, Frants R
Eberlin, Marcos N
Abstract: The progress of an on-surface polymerization process involving alkyl and perfluoroalkyl silanes and siloxanes was monitored in real-time via easy ambient sonic spray ionization mass spectrometry (EASI-MS). When sprayed on surfaces, the organosilicon compounds present in commercially available nanofilm products (NFPs) react by condensation to form a polymeric coating. A NFP for coating of floor materials (NFP-1) and a second NFP for coating tiles and ceramics (NFP-2) were applied to glass, filter paper or cotton surfaces and the progress of the polymerization was monitored by slowly scanning the surface. Via EASI(+)-MS monitoring, significant changes in the composition of hydrolysates and condensates of 1H,1H,2H,2H-perfluorooctyl triisopropoxysilane (NFP-1) and hexadecyl triethoxysilane (NFP-2) were observed over time. The abundances of the hydrolyzed species decreased compared with those of the non-hydrolysed species for both NFP-1 and NFP-2 and the heavier oligomers became relatively more abundant over a period of 15-20 min. A similar tendency favouring the heavier oligomers was observed via EASI(-)-MS. This work illustrates the potential of ambient mass spectrometry for the direct monitoring of polymerization reactions on surfaces.
Subject: Molecular Structure
Spectrometry, Mass, Electrospray Ionization
Rights: fechado
Identifier DOI: 10.1002/rcm.4794
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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