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A Study on Emulsion Copolymerization of $\alpha,\omega$-Diacrylate Poly(dimethylsiloxane) Containing Vinyl Ester of Versatic Acid/Vinyl Acetate  

Naghash, Hamid Javaherian (Department of Chemistry, Islamic Azad University)
Mallakpour, Shadpour (Organic Polymer Chemistry Research Laboratory, College of Chemistry, Isfahan University of Technology)
Forushani, Parivash Yavari (Department of Chemistry, Islamic Azad University)
Uyanik, Nurseli (Department of Chemistry, Istanbul Technical University)
Publication Information
Polymer(Korea) / v.32, no.2, 2008 , pp. 95-102 More about this Journal
Abstract
The $\alpha$,$omega$-diacrylate poly(dimethylsiloxane) (DA-PDMS) containing vinyl ester of versatic acid/vinyl acetate (Veova-10/VAc) was prepared by emulsion copolymerization of (DA-PDMS), Veova-10 (with VAc), and auxiliary agents at $85^{\circ}C$ in the presence of ammonium peroxodisulfate (APS) as an initiator. Sodium dodecyl sulfate (SDS) and nonylphenol ethylene oxide-40 units (NP-40) were used as anionic and nonionic emulsifiers, respectively. The resulting copolymers were characterized by using Fourier transform infrared spectroscopy (FT-IR). Thermal properties of the copolymers were studied by using thermogravimetric analysis(TGA) and differential scanning calorimetry (DSC). The morphology of copolymers was also investigated by scanning electron microscopy (SEM) and then the effects of variables such as temperature, agitation speed, surfactant kinds, molecular weights, initiator, and DA-PDMS concentrations on the properties of the silicone-containing Veova-10/VAc emulsions were examined. The calculation of monomer conversion versus time histories indicates that by increasing the DA-PDMS concentration the polymerization rate and the number of polymer particles decrease, respectively.
Keywords
emulsion copolymerization; silicone containing emulsions; $\alpha$,$\omega$-diacrylate poly(dimethylsiloxane); vinyl ester of versatic acid; vinyl acetate;
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