dc.contributorUniversidade Estadual Paulista (Unesp)
dc.contributorUniversidade Federal de São Carlos (UFSCar)
dc.date.accessioned2018-12-11T17:34:28Z
dc.date.available2018-12-11T17:34:28Z
dc.date.created2018-12-11T17:34:28Z
dc.date.issued2018-03-01
dc.identifierJournal of Thermal Analysis and Calorimetry, v. 131, n. 3, p. 2205-2212, 2018.
dc.identifier1588-2926
dc.identifier1388-6150
dc.identifierhttp://hdl.handle.net/11449/179274
dc.identifier10.1007/s10973-017-6755-9
dc.identifier2-s2.0-85031101248
dc.identifier2-s2.0-85031101248.pdf
dc.identifier8251270609012225
dc.identifier0000-0002-6870-6961
dc.description.abstractThe use of fertilizer and water availability are essential factors limiting the agricultural production. The controlled release technology is very promising because it allows the maintenance of fertilizer concentrations within an ideal range avoiding inefficiency and toxicity problems, minimizing the environmental impacts and improving their efficiency. In this context, the nanostructured hydrogels appear as a possible carrier vehicle for these controlled release systems due to their inherent properties, such as biodegradability, low toxicity, and cost, rapid absorption and desorption controlled capacity of water and solutes. In this work, we performed the synthesis of nanostructured hydrogels based on poly(methacrylic acid) (PMAA)/Cloisite-Na+ via free radical polymerization. SEM images indicated a similarity in the basic structure of all nanocomposites. The porous diameter of the hydrogels increased with increasing of nanoclay content. EDS analysis showed the ions belonging to nanoclay present in the nanocomposites, confirming the formation of true nanocomposites. TG–DTG and DSC techniques confirmed an improvement in the thermal stability of nanocomposites caused by the addition of nanoclay. For instance, the degradation initial temperature of the hydrogel was increased from 198.5 to 203.5 °C, and inversely, the degradation rate of the 2° thermal event was decreased from 0.694 to 0.472% min °C−1, when the nanoclay was increased from 0 to 20 mass/%. Moreover, the controlled release investigation showed an improvement in the release time and quantity of the fertilizer released with nanoclay content. This result is very required for this specific application.
dc.languageeng
dc.relationJournal of Thermal Analysis and Calorimetry
dc.relation0,587
dc.relation0,587
dc.rightsAcesso aberto
dc.sourceScopus
dc.subjectControlled release
dc.subjectHydrogel
dc.subjectMorphologic properties
dc.subjectNanoclay
dc.subjectNanocomposites
dc.subjectThermal stability
dc.titleThermal and morphological characterization of highly porous nanocomposites for possible application in potassium controlled release
dc.typeArtículos de revistas


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