The influence of the sol–gel parameters on the wetting properties of the polypropylene membranes
Paper ID : 1142-MST2015-FULL
1Parya Amirabedi, 2Reza Yegani *, 2Amir Hossein Hesaraki
1Sahand University of Technology
2Sahand University of Technology
Synthesis of superhydrophobic surface has received a great attention in the most field such as membrane based technology. In this study, the one-step sol–gel process was used to prepare superhydrophobic polypropylene (PP) membrane. Tetraethylorthosilicate (TEOS) was used as a precursor and methyltriethoxysilane (MTES) as a modifying agent. The coating sol was prepared with molar ratio of TEOS, H2O and NH4OH kept constant at1:10.52: 5.218. The influence of the sol–gel parameters, such as alcoholic solvents and reaction time was investigated on the morphology and hydrophobic properties of the modified membrane. In order to improve the chemical connection of modified silica nanoparticle and polymeric membrane Piranha solution was used to oxidize the membrane surface and formation OH functional groups. We characterized the modified membrane by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), water contact angle (CA) and mechanical properties. Ultra sonication test was conducted to examine the structural stability of the modified membrane. The experimental results revealed that for the different alcoholic solvents reaction rates were fastest whit methanol. When the treatment time increased to 6h, although a larger amount of modified silica nanoparticle was expected to be generated on the membrane surface, the polymeric substrate became weaker due to the over-long reaction in the alkaline solution. The best hydrophobic PP membrane showed a water contact angle of 157◦.
Superhydrophobic, Sol–gel, Polypropylene membrane, Modified Membrane
Status : Paper Accepted (Oral Presentation)