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Microemulsion Copolymerization Modeling Study Via a Combined Integral‐Differential Experimental Data Processing Approach
Author(s) -
LópezSerrano F.,
Mendizábal E.,
Puig J.E.,
Álvarez J.
Publication year - 2009
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200950904
Subject(s) - copolymer , micelle , comonomer , microemulsion , styrene , materials science , acrylonitrile , pulmonary surfactant , chemical engineering , chemistry , thermodynamics , polymer chemistry , polymer , organic chemistry , physics , composite material , aqueous solution , engineering
On the basis of the data processing technique associated with the integro‐differential (ID) modeling assessment methodology, the styrene‐acrylonitrile microemulsion copolymerization system is studied, with a three‐state (conversion, active particles and micelles) and four‐parameter model (entrance and exit of radicals to and from particles, monomer transport from micelles to growing particles and initial micelle number), in conjunction with experimental conversion measurements. Comparing with the standard regression method, employed in previous studies, the ID approach incorporates additional information contained in the smooth conversion measurement derivative and does not require relying on a constant number of particles, as the slope‐and‐intercept method does. The resulting model, tested at three initiator concentrations, temperatures and comonomer feed, describes the S‐shaped conversion and the bell‐shaped active particles evolutions. This last finding is contrary to previous assumptions on linear growth with time of active particles. As expected, the entry and exit rate coefficients increase with initiator and styrene concentration and temperature. The surfactant transport from micelles decreases with initiator concentration and the initial micelles concentration value only affects the entry rate.