Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/12139
Title: Fotodegradação de hidrogel de poliacrilamidana presença de íons para o uso na agricultura
Other Titles: Photodegradation of polyacrylamide hydrogel in presence of ions for use in agriculture
Authors: Oliveira, Luiz Fernando Coutinho de
Oliveira, Juliano Elvis
Oliveira, Luiz Fernando Coutinho de
Franco, Camila Silva
Carvalho, Daniel Fonseca de
Keywords: Polímeros – Degradação
Hidrogel
Radiação ultravioleta
Polymers – Degradation
Hydrogel
Ultraviolet radiation
Issue Date: 28-Dec-2016
Publisher: Universidade Federal de Lavras
Citation: FREITAS, J. S. Fotodegradação de hidrogel de poliacrilamidana presença de íons para o uso na agricultura. 2016. 78 p. Dissertação (Mestrado em Recursos Hídricos)-Universidade Federal de Lavras, Lavras, 2016.
Abstract: Hydrogels are defined as tridimensional polymer networks with waterholding capacity within its structure that have theability to swell without the occurrence of its dissolution. This type of producthas been widely used in agriculture as a soil conditioner, because the polyacrylamide, basic constituent of the hydrogel, has the characteristic of absorbing water by physical process, and stock for the plants according to their water requirements. However, the hydrogel has endured its chain degradation because of to UV radiation, high temperatures and salts present in the soil, causing the release of residues and toxic substances, such as acrylamide which is a synthetic and non-biodegradable substance. This study aimed to evaluate the photodegradation of polyacrylamide and the effect of some metallic ions present in the soil in the degradation of this polymer. For the evaluation of photodegradation of polyacrylamide was built a photodegradation chamber with artificial lighting, in which the hydrogel samples were stored, receiving the addition of ions solutions: aluminum, calcium, iron, phosphorus, nitrogen and potassium. After the photodegradation of different samples of hydrogel were made material characterization tests to determine the impact of different ions in the photodegradation process of the material. The chemical analysis of the polyacrylamide was performed by Fourier transform infrared spectrometry (FTIR) and the physical analysis was performed by Scanning Electron Microscopy (SEM) in which together to demonstrate the degree of polymer degradation. Was also assessed the water retention in soil with of the gel and the degradation kinetics of polymer in different times of exposure to light and salt solutions. The results showed that after degraded polyacrylamide lost its water retention characteristics, with the modification of its polymer chains and gel appearance. Furthermore with the FTIR was observed a decrease in the amide grouping being indicative of the polyacrylamide chain scission in acrylamide.
URI: http://repositorio.ufla.br/jspui/handle/1/12139
Appears in Collections:Recursos Hídricos - Mestrado (Dissertações)



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