Publicação
Gellan gum-O,O′-bis(2-aminopropyl)-polyethylene glycol hydrogel for controlled fertilizer release
| Resumo: | A gellan gum–Jeffamine superabsorbent hydrogel was obtained with different crosslink densities using different amountsof (1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride) and N-hydroxysuccinimide. Infrared spectroscopy and thermalanalysis confirm the crosslinking. A morphology analysis indicates denser structures for samples with higher crosslinking points. Theswelling degree in high-acyl gellan gum hydrogels was equivalent to 145 times their dry weig ht, and 77 times when low-acyl gellangum was used. Hydrogels also showed a 450 min water retention, as opposed to 280 min for pure water, evidencing good humiditycontrol, suitable for use in arid climates. They also demonstrated a maximum release of commercial fer tilizer of about 400 mg pergram for KH2PO4and about 300 mg per gram for NPK 20-5-20. |
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| Autores principais: | Sabadini, R. C. |
| Outros Autores: | Silva, Maria Manuela; Pawlicka, A.; Kanicki, J. |
| Assunto: | Crosslinking Gels Swelling Ciências Naturais::Ciências Químicas |
| Ano: | 2018 |
| País: | Portugal |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso restrito |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | A gellan gum–Jeffamine superabsorbent hydrogel was obtained with different crosslink densities using different amountsof (1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride) and N-hydroxysuccinimide. Infrared spectroscopy and thermalanalysis confirm the crosslinking. A morphology analysis indicates denser structures for samples with higher crosslinking points. Theswelling degree in high-acyl gellan gum hydrogels was equivalent to 145 times their dry weig ht, and 77 times when low-acyl gellangum was used. Hydrogels also showed a 450 min water retention, as opposed to 280 min for pure water, evidencing good humiditycontrol, suitable for use in arid climates. They also demonstrated a maximum release of commercial fer tilizer of about 400 mg pergram for KH2PO4and about 300 mg per gram for NPK 20-5-20. |
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