Effect of pH and Monomer Dosing Rate in the Anionic Polymerization of Ethyl Cyanoacrylate in Semicontinuous Operation
Nanoparticles of poly(ethyl cyanoacrylate) with more than 10% solids content were prepared by semicontinuous heterophase polymerization at monomer-starved conditions varying the initial pH in the interval of 1–1.75 and at two monomer dosing rates. Measurements by scanning-transmission electron micro...
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| Format: | Article |
| Language: | English |
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Wiley
2015-01-01
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| Series: | International Journal of Polymer Science |
| Online Access: | http://dx.doi.org/10.1155/2015/827059 |
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| author | Hened Saade Suleidi Torres Cynthia Barrera Julieta Sánchez Yolanda Garza Raúl G. López |
| author_facet | Hened Saade Suleidi Torres Cynthia Barrera Julieta Sánchez Yolanda Garza Raúl G. López |
| author_sort | Hened Saade |
| collection | DOAJ |
| description | Nanoparticles of poly(ethyl cyanoacrylate) with more than 10% solids content were prepared by semicontinuous heterophase polymerization at monomer-starved conditions varying the initial pH in the interval of 1–1.75 and at two monomer dosing rates. Measurements by scanning-transmission electron microscopy allowed us to identify an inverse dependence of particle size on pH. Furthermore, all the polymerizations conducted at the slower monomer dosing rate rendered two particle populations, with the larger one formed from the aggregation of a fraction of the smaller particles. It was believed that the so slow addition of the monomer caused the formation of very small but instable particles, thereby a fraction of which aggregated to reduce the total interface particles-aqueous phase, increasing the latex stability. An increase in the monomer dosing rate led to larger and more stable particles in such way that only one population of nanoparticles with around 40 nm in average diameter was obtained. |
| format | Article |
| id | doaj-art-bbf2373fb95e4befa2ffb7d112bc5bfb |
| institution | Kabale University |
| issn | 1687-9422 1687-9430 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Polymer Science |
| spelling | doaj-art-bbf2373fb95e4befa2ffb7d112bc5bfb2025-02-03T01:02:18ZengWileyInternational Journal of Polymer Science1687-94221687-94302015-01-01201510.1155/2015/827059827059Effect of pH and Monomer Dosing Rate in the Anionic Polymerization of Ethyl Cyanoacrylate in Semicontinuous OperationHened Saade0Suleidi Torres1Cynthia Barrera2Julieta Sánchez3Yolanda Garza4Raúl G. López5Departamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada, Boulevard Enrique Reyna No. 140, 25294 Saltillo, COAH, MexicoDepartamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada, Boulevard Enrique Reyna No. 140, 25294 Saltillo, COAH, MexicoDepartamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada, Boulevard Enrique Reyna No. 140, 25294 Saltillo, COAH, MexicoDepartamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada, Boulevard Enrique Reyna No. 140, 25294 Saltillo, COAH, MexicoDepartamento de Biotecnología, Facultad de Ciencias Químicas, Universidad Autónoma de Coahuila, Boulevard V. Carranza y José Cárdenas Valdés, 25280 Saltillo, COAH, MexicoDepartamento de Procesos de Polimerización, Centro de Investigación en Química Aplicada, Boulevard Enrique Reyna No. 140, 25294 Saltillo, COAH, MexicoNanoparticles of poly(ethyl cyanoacrylate) with more than 10% solids content were prepared by semicontinuous heterophase polymerization at monomer-starved conditions varying the initial pH in the interval of 1–1.75 and at two monomer dosing rates. Measurements by scanning-transmission electron microscopy allowed us to identify an inverse dependence of particle size on pH. Furthermore, all the polymerizations conducted at the slower monomer dosing rate rendered two particle populations, with the larger one formed from the aggregation of a fraction of the smaller particles. It was believed that the so slow addition of the monomer caused the formation of very small but instable particles, thereby a fraction of which aggregated to reduce the total interface particles-aqueous phase, increasing the latex stability. An increase in the monomer dosing rate led to larger and more stable particles in such way that only one population of nanoparticles with around 40 nm in average diameter was obtained.http://dx.doi.org/10.1155/2015/827059 |
| spellingShingle | Hened Saade Suleidi Torres Cynthia Barrera Julieta Sánchez Yolanda Garza Raúl G. López Effect of pH and Monomer Dosing Rate in the Anionic Polymerization of Ethyl Cyanoacrylate in Semicontinuous Operation International Journal of Polymer Science |
| title | Effect of pH and Monomer Dosing Rate in the Anionic Polymerization of Ethyl Cyanoacrylate in Semicontinuous Operation |
| title_full | Effect of pH and Monomer Dosing Rate in the Anionic Polymerization of Ethyl Cyanoacrylate in Semicontinuous Operation |
| title_fullStr | Effect of pH and Monomer Dosing Rate in the Anionic Polymerization of Ethyl Cyanoacrylate in Semicontinuous Operation |
| title_full_unstemmed | Effect of pH and Monomer Dosing Rate in the Anionic Polymerization of Ethyl Cyanoacrylate in Semicontinuous Operation |
| title_short | Effect of pH and Monomer Dosing Rate in the Anionic Polymerization of Ethyl Cyanoacrylate in Semicontinuous Operation |
| title_sort | effect of ph and monomer dosing rate in the anionic polymerization of ethyl cyanoacrylate in semicontinuous operation |
| url | http://dx.doi.org/10.1155/2015/827059 |
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