Effect of Monomer Dosing Rate in the Preparation of Mesoporous Polystyrene Nanoparticles by Semicontinuous Heterophase Polymerization
The semicontinuous heterophase polymerization of styrene in the presence of cross-linking and porogen agents was carried out. Latexes with close to 20% solid content, which contained mesoporous nanoparticles with 28 nm in average diameters, up to 0.5 cm3/g in porosity and 6–8 nm in pore diameters we...
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MDPI AG
2014-12-01
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| Series: | Molecules |
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| Online Access: | http://www.mdpi.com/1420-3049/20/1/52 |
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| author | Dalia Y. Sosa Lourdes Guillén Hened Saade Eduardo Mendizábal Jorge E. Puig Raúl G. López |
| author_facet | Dalia Y. Sosa Lourdes Guillén Hened Saade Eduardo Mendizábal Jorge E. Puig Raúl G. López |
| author_sort | Dalia Y. Sosa |
| collection | DOAJ |
| description | The semicontinuous heterophase polymerization of styrene in the presence of cross-linking and porogen agents was carried out. Latexes with close to 20% solid content, which contained mesoporous nanoparticles with 28 nm in average diameters, up to 0.5 cm3/g in porosity and 6–8 nm in pore diameters were obtained. By varying the monomer dosing rate over the micellar solution, an unexpected direct dependence of instantaneous conversion on the monomer dosing rate was found. This was ascribed to the higher average number of radicals per particle attained in the polymerization at the higher dosing rate, which in turn would arise from the higher gel percentage in the polymer. It is believed that the cross-linked chains prevent encounters between radicals, delaying the bimolecular termination reactions and allowing the existence of more than one radical inside the particles, which in turn increases the propagation rate. |
| first_indexed | 2024-12-12T06:57:39Z |
| format | Article |
| id | doaj.art-fbd54ebf875d4b89a93709f4f8995b42 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-12-12T06:57:39Z |
| publishDate | 2014-12-01 |
| publisher | MDPI AG |
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| series | Molecules |
| spelling | doaj.art-fbd54ebf875d4b89a93709f4f8995b422022-12-22T00:33:55ZengMDPI AGMolecules1420-30492014-12-01201526910.3390/molecules20010052molecules20010052Effect of Monomer Dosing Rate in the Preparation of Mesoporous Polystyrene Nanoparticles by Semicontinuous Heterophase PolymerizationDalia Y. Sosa0Lourdes Guillén1Hened Saade2Eduardo Mendizábal3Jorge E. Puig4Raúl G. López5Departamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, C. P. 25294 Saltillo, Coahuila, MexicoDepartamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, C. P. 25294 Saltillo, Coahuila, MexicoDepartamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, C. P. 25294 Saltillo, Coahuila, MexicoDepartamentos de Química e Ingeniería Química, Centro Universitario de Ciencias Exactas e Ingenierías, Universidad de Guadalajara, Blvd. M. García-Barragán No. 1451, C. P. 44430 Guadalajara, Jalisco, MexicoDepartamentos de Química e Ingeniería Química, Centro Universitario de Ciencias Exactas e Ingenierías, Universidad de Guadalajara, Blvd. M. García-Barragán No. 1451, C. P. 44430 Guadalajara, Jalisco, MexicoDepartamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, C. P. 25294 Saltillo, Coahuila, MexicoThe semicontinuous heterophase polymerization of styrene in the presence of cross-linking and porogen agents was carried out. Latexes with close to 20% solid content, which contained mesoporous nanoparticles with 28 nm in average diameters, up to 0.5 cm3/g in porosity and 6–8 nm in pore diameters were obtained. By varying the monomer dosing rate over the micellar solution, an unexpected direct dependence of instantaneous conversion on the monomer dosing rate was found. This was ascribed to the higher average number of radicals per particle attained in the polymerization at the higher dosing rate, which in turn would arise from the higher gel percentage in the polymer. It is believed that the cross-linked chains prevent encounters between radicals, delaying the bimolecular termination reactions and allowing the existence of more than one radical inside the particles, which in turn increases the propagation rate.http://www.mdpi.com/1420-3049/20/1/52mesoporous polystyrene nanoparticlessemicontinuous heterophase polymerizationmonomer dosing rate effect |
| spellingShingle | Dalia Y. Sosa Lourdes Guillén Hened Saade Eduardo Mendizábal Jorge E. Puig Raúl G. López Effect of Monomer Dosing Rate in the Preparation of Mesoporous Polystyrene Nanoparticles by Semicontinuous Heterophase Polymerization Molecules mesoporous polystyrene nanoparticles semicontinuous heterophase polymerization monomer dosing rate effect |
| title | Effect of Monomer Dosing Rate in the Preparation of Mesoporous Polystyrene Nanoparticles by Semicontinuous Heterophase Polymerization |
| title_full | Effect of Monomer Dosing Rate in the Preparation of Mesoporous Polystyrene Nanoparticles by Semicontinuous Heterophase Polymerization |
| title_fullStr | Effect of Monomer Dosing Rate in the Preparation of Mesoporous Polystyrene Nanoparticles by Semicontinuous Heterophase Polymerization |
| title_full_unstemmed | Effect of Monomer Dosing Rate in the Preparation of Mesoporous Polystyrene Nanoparticles by Semicontinuous Heterophase Polymerization |
| title_short | Effect of Monomer Dosing Rate in the Preparation of Mesoporous Polystyrene Nanoparticles by Semicontinuous Heterophase Polymerization |
| title_sort | effect of monomer dosing rate in the preparation of mesoporous polystyrene nanoparticles by semicontinuous heterophase polymerization |
| topic | mesoporous polystyrene nanoparticles semicontinuous heterophase polymerization monomer dosing rate effect |
| url | http://www.mdpi.com/1420-3049/20/1/52 |
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