Prediction of resin textural properties by vinyl/divinyl copolymerization modeling
| Autor: | J. R. Dias, Juliana O.V. Moura, Vinícius M.P. Lopes, Leandro G. Aguiar, Turibio Gomes Soares Neto, T. R. Theodoro |
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| Rok vydání: | 2017 |
| Předmět: |
Gel point
Heptane Materials science Polymers and Plastics Ethylene glycol dimethacrylate Organic Chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Divinylbenzene 01 natural sciences Toluene RESINAS 0104 chemical sciences Styrene chemistry.chemical_compound Chemical engineering chemistry Specific surface area Polymer chemistry Materials Chemistry Copolymer 0210 nano-technology |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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