Please use this identifier to cite or link to this item: https://hdl.handle.net/10216/103958
Author(s): Miguel A. D. Gonçalves
Virgínia D. Pinto
Rolando C. S. Dias
Mário Rui P. F. N. Costa
Title: Kinetic modeling of the suspension copolymerization of styrene/ divinylbenzene with gel formation
Issue Date: 2011
Abstract: Experimental and theoretical studies concerning the suspension copolymerizationof styrene with divinylbenzene are reported. Experiments were carried outin a batch stirred reactor, at 1.2 dm3 scale, and extended beyond gelation in order tosynthesize insoluble material. Looking for real time information concerning thebuilding process of such materials, these polymerizations were In-line monitoredusing a FTIR-ATR immersion probe. Polymer samples collected before and aftergelation were Off-line characterized using a SEC/RI/MALLS system allowing themeasurement of monomer conversion, average molecular weights, MWD and alsothe z-average radius of gyration. The weight fraction of insoluble material (gel) wasmeasured for samples with different reaction times. The experimental program hasincluded the study of the influence of key polymerization parameters on thedynamics of gelation and some properties of the resulting networks, namely theinitial mole fraction of crosslinker and the initial proportions between monomers andinert diluent. Variable n-heptane/toluene mixtures were used within this purpose.These experimental observations were complemented with theoretical studies usinga general kinetic approach allowing the prediction of MWD and z-average radius ofgyration before and also after gelation. Comparison of the experimental measurementswith these predictions is being exploited to develop modeling tools useful forthe design of operating conditions allowing the improvement of the performance ofthe final products.
Subject: Engenharia dos materiais
Materials engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia dos materiais
Engineering and technology::Materials engineering
URI: https://repositorio-aberto.up.pt/handle/10216/103958
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Programa de Financiamento Plurianual de Unidades de I&D/PEst-C/EQB/LA0020/2011/Projeto Estratégico-LA 20 - 2011-2012/LA 20
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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