Por favor, use este identificador para citar o enlazar este ítem: https://hdl.handle.net/20.500.12104/44451
Título: Semicontinuous heterophase copolymerization of vinyl acetate and butyl acrylate
Autor: Ovando-Medina, V.M.
Diaz-Flores, P.E.
Peralta, R.D.
Mendizábal, E. M.
Cortez-Mazatan, G.Y.
Fecha de titulación: 2013
Resumen: Vinyl acetate (VAc) and butyl acrylate (BuA) were copolymerized in heterophase by a semicontinuous process (unseeded) and compared with the seeded semicontinuous microemulsion polymerization of the same monomers. A mixture of sodium dodecyl sulfate (SDS) and poly(ethylene oxide) dodecyl ether (Brij-35) were used as surfactants. The effects of monomer addition rate (Ra) and surfactants concentrations (4 or 1 wt % with respect to the initial mixture of reaction) on polymer and latex properties were studied. High copolymer content latexes (24-36 wt %) with average particle diameters (Dp) from 38 to 55 nm and relatively narrow particle size distributions, high polymerization rates, weight ratios of polymer to surfactant (P/S) from 13.3 to 32.8 were obtained. The number-average molecular weights (Mn) were between 96,000 and 188,000 g/mol. Homogeneous copolymer compositions were obtained throughout the reaction for both, seeded and unseeded processes, which is not possible by the usual batch microemulsion process. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013 Copyright © 2012 Wiley Periodicals, Inc.
URI: http://www.scopus.com/inward/record.url?eid=2-s2.0-84870252737&partnerID=40&md5=373776061f6f7a828f4f405d02d98e88
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