Thiol-ended polyethylene oxide as reactive stabilizer for dispersion polymerization of styrene |
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Authors: | E Bourgeat-Lami A Guyot |
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Institution: | (1) Centre National de la Recherche Scientifique Laboratoire de Chimie et Procédés de Polymérisation: CPE Ba^t 308 F. B. P. 2077 43, Boulevard du 11 Novembre 1918 69616 Villeuranne Cedex, France, FR |
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Abstract: | Radical dispersion polymerization of styrene in aqueous ethanol solutions was performed in the presence of a new reactive
polyethylene oxide stabilizer with thiol end groups. This reactive stabilizer was compared to the more conventional poly (N-vinyl pyrrolidone). Particles size distribution, molecular weights and kinetics were investigated. Monodispersed polymer
particles with diameter in the range 200–2000 nm were obtained depending on the amount of stabilizer used. In all cases, the
polyethylene oxide (PEO) sequence of the dispersant was partly incorporated at the surface of the latex particles, but the
grafting yield of polyethylene oxide chains was always limited and did not exceed 15%. Part of the stabilizer being unreacted
or reacted with low molecular weight polystyrene remained in the continuous phase.
Received: 26 September 1996 Accepted: 4 March 1997 |
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Keywords: | Dispersion polymerization styrene reactive stabilizer molecular weight particles size incorporation yield |
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