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Tuesday, 12 November 2019
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Raw materials & technologies, Technologies

Facile fabrication of novel hydrophobic composites

Wednesday, 30 October 2019

Recently, researchers fabricated fluorine–silicon-containing poly (styrene–acrylate)/SiO2 hydrophobic composites by combining physically mixing and sol–gel process.

The water contact angle (WCA) of the composite films were found to increase with the copolymerisation and sol–gel processes. Quelle: geralt / Pixabay.

The water contact angle (WCA) of the composite films were found to increase with the copolymerisation and sol–gel processes. Quelle: geralt / Pixabay.

Novel hydrophobic composites (FS-PSA/SiO2) were prepared by directly physically mixing fluorine–silicon-containing poly (styrene–acrylate) latexes (FS-PSA) with colloidal silica. Sol–gel processes were carried out between silica particles and silanol groups on the surface of poly (styrene–acrylate) latexes to enhance the roughness and hydrophobicity of composite films. TEM photos revealed that FS-PSA latexes exhibited a clear core–shell structure. The intermolecular hydrogen bonding guaranteed the uniform dispersion of silica particles. The average diameter data indicated that the copolymerisation and sol–gel process had all increased the average diameter of the composite latexes.

Rougher composite films by sol–gel processes

FTIR and XPS spectra confirmed that two kinds of Si–O bonds existed in the composite films, of which one was related to the Si–O groups of colloidal silica while the other was related to the Si–O–Si groups obtained from the sol–gel processes. SEM and AFM images revealed that the sol–gel processes had increased the roughness of the composite films. The water contact angle (WCA) of the composite films were found to increase with the copolymerisation and sol–gel processes. Thermogravimetric analysis (TGA) curves demonstrated that the FS-PSA/SiO2 composite films exhibited much better thermal stability than the PSA and FS-PSA films.

The study is published in: Journal of Coatings Technology and Research  September 2019, Volume 16, Issue 5, pp 1243–1252.

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