Effect of Modified Silica Materials on Polyvinyl Chloride (PVC) Substrates to Obtain Transparent and Hydrophobic Hybrid Coatings

Applied Sciences

Simona Căprărescu¹  Hermine Stroescu²  Mihai Anastasescu²  Florentina Monica Raduly³  Violeta Purcar³  Cristian-Andi Nicolae³  Valentin Rădițoiu³  Adriana Nicoleta Frone³  Georgiana Cornelia Ispas³  Bogdan Trică³  Alina Rădițoiu³ 

[1] Faculty of Applied Chemistry and Materials Science, Inorganic Chemistry, Physical Chemistry and Electrochemistry Department, University Politehnica of Bucharest, Ghe. Polizu Street, no. 1-7, 011061 Bucharest, Romania;Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy, Splaiul Independentei no. 202, 6th District, 060021 Bucharest, Romania;National Institute for Research and Development in Chemistry and Petrochemistry—ICECHIM, Splaiul Independentei no. 202, 6th District, 060021 Bucharest, Romania;

关键词: sol–gel method;    silica materials;    hydrophobic coatings;    PVC substrate;   

DOI  :  10.3390/app112211044

来源: DOAJ

【 摘 要 】

In this research, we report a simple and inexpensive way to prepare transparent and hydrophobic hybrid coatings through deposition of different silica materials on polyvinyl chloride (PVC) substrates. The silica materials were prepared using an acid-catalyzed sol–gel method at room temperature (25 ± 2 °C), using alkoxysilanes: tetraethoxysilane (TEOS), as the silica source, and ethoxydimethylvinylsilane (DMVES), triethoxyoctylsilane (OTES), and trimethoxyhexadecylsilane (HDTMES), as modifier agents. The obtained materials were characterized (either as powders or as thin films) by Fourier-transform infrared spectroscopy (FTIR), UV/Vis spectroscopy, transmission electron microscopy (TEM), thermogravimetric analysis (TGA), atomic force microscopy (AFM), spectroscopic ellipsometry (SE), and water contact-angle measurements. UV/Vis spectra showed that the PVC substrate coated with the silica material containing TEOS/DMVES/OTES had a transmittance of about 90% in the wavelength range of 650–780 nm. The water contact angles increased from 83° for uncoated PVC substrate to ~94° for PVC substrates coated with the sol–gel silica materials. These PVC films with hybrid silica coatings can be used as the materials for outdoor applications, such as energy-generating solar panel window blinds or PVC clear Windmaster outdoor blinds.

【 授权许可】

Unknown