4TH International Congress on Technology - Engineering & SCIENCE - Kuala Lumpur - Malaysia (2017-08-05)

Investigation Of Benzyl Metacrylate Or Stearyl Acrylate Polymerization On The Surface Of γ-methacryloxy Propyl Trimethoxy Silane Modified Silica Ball
Up to date, much attention has been paid to develop the superhydrophobic surfaces due to their high potential applications in a variety of areas. Organic–inorganic hybrid materials have attracted great interest for many years because they exhibit complementary physicochemical properties such as hydrophilicity and hydrophobicity [1-3]. Those properties can be tunable through the control of size or functionality of the components. Super-hydrophobic textiles formed by depositing of superhydrophobic coating materials onto soft textile surfaces can provide the water repellency and self-cleaning properties. So the properties provide higher potential application at sports or leisure industry [2]. It is a technical challenge to fabricate durable superhydrophobic textile surfaces and maintain their pristine performance properties such as air permeability, softness and color by a single coating procedure, simultaneously. When super-hydrophobicity is applied into surface coating area, the anti-dusting properties increase, so the paint containing superhydrophobic materials can have a long-lasting property for against the natural wear and tear [1-4]. The research regarding on the building applications of polyacrylate/silica nanocomposite has been spotlighted since the uniform dispersal of nano-SiO2 in the polymer can improve the strength and the climate-resistance of the polymer materials. Moreover, superhydrophobic surfaces that water contact angle is more than 150◦ have shown promising anti-icing performance. When the surface is covered with superhydrophobic core-shell materials, these coatings have only weak adhesion to ice and can be characterized as very icephobic coatings [5-7]. In this study, multi layered core-shell hybrid particles with multiple functions was designed and prepared by a three-step process. First, silica ball particle was synthesized by sol-gel synthesis of glass silica. Second, the surface was modified by of γ-methacryloxy propyl trimethoxy silane to form inorganic-organic core shell complex. Finally, stearyl acrylate, benzyl metacrylate, octadecyl methacrylate (ODMA) and behenyl stearate were anchored on the surface by copolymerization. Stearyl acrylate monomer with C=C bonds was polymerized on the surface of MPS/SiO2 core-shell particles to form stearyl acrylate/ γ-MPS/SiO2 multi-layer composites. Similarly, various acrylate compounds, such as benzyl metacrylate, ODMA monomer was chosen for surface polymerization because multi layered core-shell hybrid particles can provide super-hydrophobic properties. Each step, particle size and surface zeta potential were analyzed by scattering method (Malvern Instruments Ltd). The thermo gravimetric (TG) data obtained from thermo gravimetric analysis (TGA, Mettler TG50 Thermobalance, nitrogen atmosphere over a temperature range of 20 – 900 ℃ at a heating rate of 5 ℃/min) provide the evidence of core-shell complexation. The surface hydrophobicity was analyzed by contact angle analyzer. Figure 1 shows the schematic diagram of multi-step synthesis of multi layered core-shell hybrid particles.
Keywords: stearyl acrylate/ γ-MPS/SiO2 multi-layer composites, super-hydrophobic, core-shell, polymerization, zeta potential
Dong Ho Park, Jin Young Ko, Seung-Kyu Park