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Solution and quasi-bulk copolymerizations of styrene and methyl methacrylate in the presence of polybutadiene: Mathematical model

✍ Scribed by Carolina Gutierrez; Diana A. Estenoz; Luis M. Gugliotta; Jorge R. Vega; Gregorio R. Meira

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
291 KB
Volume
117
Category
Article
ISSN
0021-8995

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✦ Synopsis

Abstract

A mathematical model was developed for simulating the batch copolymerization of styrene (St) and methyl methacrylate (MMA) in the presence of polybutadiene (PB). It was adjusted to the measurements of three reactions carried out at 65Β°C, with initial comonomers ratio at the azeotropic condition, THF as solvent, and benzoyl peroxide as initiator. The measurements included: (a) conversions and grafting efficiencies by gravimetry; (b) molecular weight distributions (MWDs) by size exclusion chromatography; and (c) global mass fractions of St in the co‐ and terpolymer, by UV‐Vis spectroscopy. The model predicts the MWDs of the three polymeric components of MBS: free St‐MMA copolymer, St‐MMA‐g‐PB graft terpolymer (GT), and residual PB. In addition, it predicts the bivariate chain length distributions of the different GT topologies, with each topology characterized by the number of branches per molecule. Β© 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

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