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Home  > Raw materials & technologies  > Technologies  > Polysilsesquioxane-based trilayer latex co...

Monday, 19 November 2018
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Raw materials & technologies, Technologies

Polysilsesquioxane-based trilayer latex coatings

Friday, 9 November 2018

Scientists recently dealt with the fabrication and properties of polysilsesquioxane-based trilayer core–shell structure latex coatings with fluorinated polyacrylate and silica nanocomposite as the shell layer

Coatings based on polysilsesquioxanes (PSQ) are applied to light-emitting diodes, for instance. Source:  i-picture – stock.adobe.com.

Coatings based on polysilsesquioxanes (PSQ) are applied to light-emitting diodes, for instance. Source:  i-picture – stock.adobe.com.

Polysilsesquioxanes (PSQ)-based core–shell fluorinated polyacrylate/silica hybrid latex coatings were synthesised with PSQ latex particles as the seeds, and methyl methacrylate, butyl acrylate, 3-(trimethoxysilyl) propyl methacrylate (MPS)-modified SiO2 nanoparticles (NPs), 1H,1H,2H,2H-perfluorooctyl methacrylate (PFOMA) as the shell monomers by emulsifier-free miniemulsion polymerisation. The results of Fourier transform IR spectroscopy, transmission electron microscopy, and dynamic light scattering suggested the obtained hybrid particles emerged with trilayer core–shell pattern.

Enhanced thermostability of PSQ-based polyacrylate latex film

Contact angle analysis, x-ray photoelectron spectroscopy, and atom force microscopy results indicated that the hybrid film containing SiO2 NPs showed higher hydrophobicity, lower surface free energy and water absorption, in comparison with the control system (without SiO2 NPs). Compared with the control system, the hybrid latex film containing SiO2 NPs in the fluorinated polyacrylate shell layer showed the higher content of fluorine atoms and a rougher morphology on the film surface. Additionally, thermogravimetric analysis demonstrated the enhanced thermostability of PSQ-based nanosilica composite fluorinated polyacrylate latex film.

The study is published in: Journal of Coatings Technology and Research  September 2018, Volume 15, Issue 5, pp 1077–1088.

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