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Understanding the interface structures of water-based and solvent-based poly(methyl methacrylate) coatings at the molecular level.
- Source :
-
Applied Surface Science . Mar2022, Vol. 579, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- [Display omitted] • Utilizing SFG to investigate the buried interface structure of water-based and solvent-based PMMA coatings. • Clarified the difference in interface structure between water-based and solvent-based PMMA coatings. • Providing the methods to improve the interface structure of polymer coatings. Water-based polymer coatings usually exhibit poor adhesion performance compared to their solvent-based counterparts. Unveiling the difference in interface structures between water-based and solvent-based polymer coatings will help to improve the adhesion performance of water-based polymer coatings. Herein, sum frequency generation (SFG) vibrational spectroscopy was utilized to detect the buried interfaces of water-based and solvent-based polymer coatings. Water-based poly(methyl methacrylate) (PMMA) coatings containing sodium dodecyl sulfate (SDS) as an emulsifier and solvent-based PMMA coatings using toluene as solvent were selected as the model systems for this investigation. The results demonstrate that the interface between water-based PMMA and silica substrate is mainly occupied by SDS and water molecules, and the polymer chains show random-coil conformations due to their encapsulation by SDS. In contrast, for the solvent-based PMMA, the PMMA chains directly contact the silica substrate and exhibit stretched chain conformations at the interface. The interface structure of water-based PMMA coatings can be improved by annealing at T g + 70 ℃ to form an adsorbed polymer layer. This work reveals the origin of the difference in the adhesion strength of water-based and solvent-based polymer coatings at the molecular level, which is significant for the design and performance optimization of water-based polymer coatings. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01694332
- Volume :
- 579
- Database :
- Academic Search Index
- Journal :
- Applied Surface Science
- Publication Type :
- Academic Journal
- Accession number :
- 154503012
- Full Text :
- https://doi.org/10.1016/j.apsusc.2021.152239