| Autor: |
Castro DP; Federal University of Rio Grande do Sul, Department of Materials Engineering, Av. Bento Gonçalves 9500, Agronomia, 91501-970 Porto Alegre, RS, Brazil., Santana RMC; Federal University of Rio Grande do Sul, Department of Materials Engineering, Av. Bento Gonçalves 9500, Agronomia, 91501-970 Porto Alegre, RS, Brazil. |
| Jazyk: |
angličtina |
| Zdroj: |
Anais da Academia Brasileira de Ciencias [An Acad Bras Cienc] 2024 Mar 18; Vol. 96 (1), pp. e20230092. Date of Electronic Publication: 2024 Mar 18 (Print Publication: 2024). |
| DOI: |
10.1590/0001-3765202420 |
| Abstrakt: |
Poly(vinyl alcohol) (PVOH) is a water-soluble polymer having a hydroxyl group as a functional group contributing to excellent membrane-forming and mechanical performance. PVOH is obtained by the hydrolysis of polyvinyl acetate, and its physical properties are affected by its degree of hydrolysis, whether, partial or complete. In this study, PVOH hydrogels were synthesized by a solution under stirring and heating techniques with citric (AC) and tartaric acids (AT) crosslinker agents, with different time reactions of 20 min.; 1; 2, and 3 h were investigated. These samples were characterized by the kinetics of water uptake, gel fraction, thermal analysis, and physical-chemical analysis, and their structure was elucidated. The results obtained have shown chemical modification by organic acids and improved the properties to good thermal stability and swelling to AT hydrogels up to 900% water uptake. In the gel fraction, the samples' esterification was shown and verified by FTIR spectra. To AC hydrogels the chemical modification was low due to the steric hindrance, which caused disintegration of the hydrogel in swelling and gel fraction test, but with absorption in the moisture test performed. The incorporation and effects of citric and tartaric acids enable the development of new hydrogel systems, with specific properties. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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