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Vol.6 , No. 3, Publication Date: May 31, 2019, Page: 18-24
![](https://www.facebook.com/dialog/feed?app_id=808315475849687&link=http://www.aascit.org/journal/archive2?journalId=905%26paperId=7374&redirect_uri=http://www.aascit.org/journal/archive2?journalId=905%26paperId=7374&display=popup&name="Synthesis and Characterization of Poly (N-Isopropylacrylamide-co-Crotonic Acid) Hydrogels "&description=N-isopropylacrylamide was copolymerized with crotonic acid in order to study the influence of the addition of ionic groups in the water absorbing capacity, the swelling kinetics to 4 and 30ºC, as well as the transition temperature obtained hydrogels. It was found that the addition of the acid groups, slightly increased the water absorbing capacity of the hydrogels, but did not change their transition temperature, however, the water fraction released at the transition point and the decrease in the water release rate were modified. Then the model of the second order kinetics was applied to determiner the process of swelling of the polymers, It was found that, the process was properly described. However when the model of the second order kinetics was applied to predict the behavior of the water release process, finding that this model did not describe the process. The second order model was modified, stating that at time zero samples are at equilibrium swelling, this change in the model was found to describe adequately the process of de-swelling of the hydrogels studied. Increasing the effectiveness for modeling the experimental data, when the acid composition is 10% or greater, with what was obtained a new model to determine adequately the release of water or solutions that could absorb these materials&picture=http://www.aascit.org/aascit/decorators/img/journal/905.jpg)
| [1] | Cortes Ortega Jorge Alberto, Department of Chemistry University of Guadalajara, Guadalajara, México. |
| [2] | Chocoteco Ramírez Erendira, Department of Chemical Engineering University of Guadalajara, Guadalajara, México. |
| [3] | Flores Román María Fernanda, Department of Chemical Engineering University of Guadalajara, Guadalajara, México. |
| [4] | Llamas Santos Allison Nabil, Department of Chemical Engineering University of Guadalajara, Guadalajara, México. |
| [5] | amirez Pulido Anna Scarlet, Department of Chemical Engineering University of Guadalajara, Guadalajara, México. |
N-isopropylacrylamide was copolymerized with crotonic acid in order to study the influence of the addition of ionic groups in the water absorbing capacity, the swelling kinetics to 4 and 30ºC, as well as the transition temperature obtained hydrogels. It was found that the addition of the acid groups, slightly increased the water absorbing capacity of the hydrogels, but did not change their transition temperature, however, the water fraction released at the transition point and the decrease in the water release rate were modified. Then the model of the second order kinetics was applied to determiner the process of swelling of the polymers, It was found that, the process was properly described. However when the model of the second order kinetics was applied to predict the behavior of the water release process, finding that this model did not describe the process. The second order model was modified, stating that at time zero samples are at equilibrium swelling, this change in the model was found to describe adequately the process of de-swelling of the hydrogels studied. Increasing the effectiveness for modeling the experimental data, when the acid composition is 10% or greater, with what was obtained a new model to determine adequately the release of water or solutions that could absorb these materials
Keywords
De-Swelling, Crotonic Acid, Hydrogels, Ph –Sensitive
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