Modeling of polymerization of methyl methacrylate in homogeneous systems as a framework for processes improvements.

• Ano de defesa: 2019
• Autor(a) principal: Intini, Antonio César de Oliveira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Biblioteca Digitais de Teses e Dissertações da USP
• Palavras-chave em Português: acrylic polymerization; azo-bisisobutironitrile; Batch reactor; Benzoyl peroxide; Cinética química; Coupled ordinary differential equations; dodecyl mercaptan; Glycol dimercapto acetate; isothermal polymerization; Matlab; Metacrilato de metila; Method of moments; Methyl methacrylate; Método de momentos; Modelagem matemática; Modeling; non-isothermal Polymerization; Optimization; Polimerização; Polimerização isotérmica; Polimerização não isotérmica; Polymath; Reator batelada; Reator semi-batelada; Semi-batch reactor
• Link de acesso: http://www.teses.usp.br/teses/disponiveis/3/3137/tde-17072019-083456/

The polymerization of methyl methacrylate (MMA) was investigated in this dissertation. Selected kinetic models from the literature were reviewed, and two new, generalized models of diffusion-limited effects (gel- and glass effects), derived from the current models were proposed and tested for bulk and solution polymerization of MMA in batch and semi-batch reactors, under isothermal and non-isothermal conditions. The newly proposed models include the capability of modeling termination by combination, radical transfer to monomer and depropagation reaction. The new and previous models were compared with experimental data of bulk and solution polymerizations of MMA, under a selection of non-steady state processes conditions (initiator and monomer feed, step changes in temperature) and compositions (initiator and chain transfer agents, regarding both type and dosages). The particular case of a non-isothermal bulk polymerization was also investigated. A simulation program (Reactormodel) was developed in Matlab, and its algorithm is provided.