Evolution of vinyl chloride conversion below critical micelle concentration: A response surface analysis |
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| Authors: | Amir Saeid Pakdel Mohammad Rezaei Behbahani Mohammad Reza Saeb Hossein Ali Khonakdar Hossein Abedini Mehdi Moghri |
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| Affiliation: | 1. Department of Resin and Additives, Institute for Color Science and Technology, Tehran, Iran;2. National Iranian South Oil Company (NISOC), Aghajari Oil and Gas Production Company (AOGPC), Omidiyeh, Iran;3. Iran Polymer and Petrochemical Institute, Tehran, Iran;4. Polymer Engineering Department, Engineering Faculty, Kashan Branch, Islamic Azad University, Kashan, Iran |
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| Abstract: | Utilizing response surface methodology, the conversion of vinyl chloride monomer (VCM) was monitored when the polymerization temperature, the type of surfactant, and the weight ratio of water‐to‐monomer (W/M) were taken as the emulsion polymerization variables. Because the homogeneous nucleation was found to be the dominant mechanism in VCM emulsion polymerization, irrespective of the surfactant concentration, the whole experiments have been carried out below critical micelle concentration of the used surfactants. Among all the studied variables, the polymerization temperature appeared as the most effective parameter; moreover, its interactive effect with W/M caused different trends in the alteration of final conversion being observed. Also, depending on the reaction temperature, the VCM conversion would be affected by the type of the surfactant used. Contrarily, simultaneous change in the type of surfactant and W/M revealed an insignificant effect on the evolution of VCM conversion. The optimization of final conversion of VCM was also accessible through contour plots of response surface methodology. It is worth noting that, taking a conventional approach into consideration, the alteration of VCM conversion seemed to be a monotonic function of temperature. J. VINYL ADDIT. TECHNOL., 21:157–165, 2015. © 2014 Society of Plastics Engineers |
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