| Texto completo | |
| Autor(es): |
Aguiar, Leandro G.
[1]
;
Moura, Juliana O. V.
[1]
;
Theodoro, Thiago R.
[1]
;
Neto, Turibio G. S.
[2]
;
Lopes, Vinicius M. P.
[2]
;
Dias, Joslaine R.
[1]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Engn Sch Lorena, Dept Chem Engn, BR-12602810 Lorena, SP - Brazil
[2] Natl Inst Space Res, Combust & Prop Associated Lab, BR-12630000 Cachoeira Paulista, SP - Brazil
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Polymer; v. 129, p. 21-31, OCT 27 2017. |
| Citações Web of Science: | 1 |
| Resumo | |
The production of polymeric resins through free-radical copolymerization is an interesting procedure from an economic standpoint; however, its mathematical representation is of great complexity. In the present study, modeling tools were used to describe the copolymerization of styrene with ethylene glycol dimethacrylate (EGDMA) beyond the gel point. Balance of species and sequences, method of moments, and numerical fractionation technique were applied in the model's kinetic description. Diffusion effects were also taken into account. The concept of elementary gel structures (EGSs) was used in order to predict textural properties of polymer particles, such as specific surface area and swollen gel volume. Suspension copolymerizations were carried out in the presence of toluene/heptane mixtures, and data on these reactions were used to assess the model's predictability. Reactivity parameters showed similarities to styrene/divinylbenzene systems. Agreement between the model and experimental data improved when diffusion effects were considered. The fitted apparent coiling factors for dry particles were found in the range of 0.368-0.406, and a linear correlation was obtained between this parameter and toluene fraction (a good solvent), being consistent with the pore formation phenomenon. (C) 2017 Elsevier Ltd. All rights reserved. (AU) | |
| Processo FAPESP: | 14/22080-9 - Estudo experimental e modelagem matemática da produção de resinas à base de estireno e de suas aplicações em catálise heterogênea |
| Beneficiário: | Leandro Gonçalves de Aguiar |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |