Polymer(Korea), Vol. 35 No. 5, pp 409-418, 2011 409 Introduction Waterborne polyurethane(WPU) materials have a wide application because of their excellent properties including good mechanical properties, abrasion, and chemical resis- tance. 1-3 However, poor water resistance and thermal stability limit their applications in some fields. On the other hand, siloxane materials have high thermal and oxidative stability, weatherability, low surface energy and a wide service tem- perature range (glass transition temperature (T g , -123 ℃)), but lower mechanical property and abrasion resistance. 4 It is possible to prepare polyurethane/silicone/acrylic (PU/Si/A) or polyurethane/silicone/vinyl acetate (PU/Si/VAc) copolymers which would have better thermo and water resistance than polyurethane (PU), while the mechanical and abrasion charac- teristics are little damaged. 5 Landfester and coworkers 6 have explored different synthetic pathways to synthesize siloxane -modified polyurethane/acrylic (PU/A) hybrid latexes with small particle sizes narrowly distributed and using the specific advantages of the miniemulsion approach. It was demonstrated by Youssef et al. 7 that the introduction of functional silane improves some physical and chemical properties, i.e. very low surface energy, excellent gas and moisture permeability, good heat stability, low temperature flexibility and biocom- patibility. Jung et al. 8 illustrated that high siloxane content PU/A hybrid nanocomposite film show a decrease of tensile strength, elastic modulus and T g an increase in water resistance as well as friction resistance. Webster et al. 9 showed PU/A hybrid coatings went from a hydrophilic surface to a hydrophobic surface when the siloxane was incorporated into the polyurethane formulation. Zhang and coworkers 10 pointed out that the Si modified PU/A emulsion resin can improve the physical and chemical properties of the building paints. According to Wu et al. 11 modification with organosilicone is one of the ideal methods available for improving the hydrophobicity of the surfaces of thermoplastic PUs coats. Zhang 12 and Lee et al. 13 indicated that the chain structure and the particle size of siloxane modified PU/A hybrid emulsion were confirmed by FTIR and TEM analysis. Additionally, the emulsion particle size was uniform and around 비닐단량체를 함유한 새로운 실리콘의 합성과 수성 Polyurethane-Veova/Vinyl Acetate 하이브리드 에멀젼 공중합체 내에서 사용 Hamid Javaherian Naghash ㆍElham Kasaeian Naeni Department of Chemistry, Islamic Azad University (2011년 2월 7일 접수, 2011년 4월 12일 수정, 2011년 4월 26일 채택) Synthesis of Novel Silicone Containing Vinylic Monomer and Its Uses in the Waterborne Polyurethane-Veova/Vinyl Acetate Hybrid Emulsion Copolymers Hamid Javaherian Naghash and Elham Kasaeian Naeni Department of Chemistry, Islamic Azad University, Shahreza Branch, P.O. Box 311-86145, Shahreza, Isfahan, I. R. Iran (Received February 7, 2011; Revised April 12, 2011; Accepted April 26, 2011) Abstract: A novel silicone (Si) containing vinylic monomer, N-(3-(triethoxysilyl)propyl) methacrylamide (TESPMA), based on 3-aminopropyltriethoxysilane (APTES) and methacryloyl chloride (MCl) has been synthesized for formulation of waterborne polyurethane (WPU). Two types of vinyl group containing Si, methacryloxypropyltriethoxysilane (MPTES) and triethoxyvinylsilane (TEVS), have been used as coupling reagents for comparison of the effects of Si kinds with TESPMA on the WPU. A series of new siliconized WPU, vinyl acetate/vinyl ester of versatic acid (VAc-Veova), TESPMA, MPTES and TEVS hybrid latexes have been successfully prepared by emulsion polymerization in the presence of WPU dispersion. Keywords: N-(3-(triethoxysilyl)propyl) methacrylamide, silicones, polyurethanes, polymer synthesis and characterization, glass transition, coatings. † To whom correspondence should be addressed. E-mail: hsbyun@kmu.ac.kr † To whom correspondence should be addressed. E-mail: Javaherian @ iaush.ac.ir