Synthesis and properties of styrene-butylacrylate emulsion copolymers modified by silane compounds

• Published in: Journal of applied polymer science Vol. 112; no. 2; pp. 1037 - 1044
• Main Authors: Naghash, Hamid Javaherian, Karimzadeh, Akram, Massah, Ahmad Reza
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 15.04.2009; Wiley
• Subjects: Applied sciences; Copolymerization; emulsion polymerization; Exact sciences and technology; Organic polymers; Physicochemistry of polymers; Preparation, kinetics, thermodynamics, mechanism and catalysts; silicones; thermal properties; Substituent effect; Terpolymer; Vinyl derivative copolymer; Emulsion copolymerization; Film; emulsion polymerization; Experimental study; Butyl acrylate copolymer; Silicon copolymer; Latex; Thermal stability; Thermal properties; silicones; Morphology; Preparation; Water absorption; Property structure relationship; Kinetics; Radical copolymerization; Styrene copolymer
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.29555

Styrene (St)/butyl acrylate (BA) copolymers were prepared by adding triethoxyvinylsilane (TEVS), trimethoxyvinylsilane (TMVS), and triphenylvinylsilane (TPVS), each one through emulsion copolymerization. The polymerization was performed with methacrylic acid and auxiliary agents at 80°C in the presence of potassium peroxodisulfate as the initiator. Nonylphenol ethylene oxide-40 units (NP-40) and sodium lauryl sulfoacetate were used as nonionic and anionic emulsifiers, respectively. The resulting copolymers were characterized by using Fourier transform infrared spectroscopy. Thermal properties of the copolymers were studied by using thermogravimetric analysis and differential scanning calorimetry. The morphology of copolymers was also investigated by optical microscopy, and then the effects of silicone kinds and concentrations on the properties of the St/BA emulsion copolymers were discussed. The obtained copolymers have high solid content (50 %) and can be used in emulsion paints as a binder. The comparison of three different vinyl silanes indicates that the TEVS influences on the copolymer properties more than the others. The calculations of monomer conversion and monomer conversion versus time histories indicate that by increasing the silicone concentration, the polymerization rate decreases.