Evaluation of Urea Encapsulation by Microcapsules of PHB/MMT and PHB/OMMT Nanocomposites

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Arjona, J. C. ; Valenzuela-Diaz, F. R. ; Wiebeck, H. ; Wang, S. H. ; Silva-Valenzuela, M. G. ; Li, B ; Li, J ; Ikhmayies, S ; Zhang, M ; Kalay, YE ; Carpenter, JS ; Hwang, JY ; Monteiro, SN ; Firrao, D ; Brown, A ; Bai, C ; Peng, Z ; EscobedoDiaz, JP ; Goswami, R ; Kim, J

• Tipo de documento: Artigo Científico
• Fonte: CHARACTERIZATION OF MINERALS, METALS, AND MATERIALS 2018; v. N/A, p. 8-pg., 2018-01-01.

Resumo

Urea is the most used nitrogen fertilizer around the world being responsible for many environmental problems. Preparation of microcapsules from biodegradable polymer has been reported as a main system to sustain active substances, finding application in different areas. The objective of this work was to sustain urea in nanocomposite microcapsules of poly(3-hidroxybutyrate) (PHB) reinforced with a smectite Brazilian clay in its natural (MMT) and modified (OMMT) form. PHB/MMT and PHB/OMMT microcapsules were obtained by w/o/w emulsion. Characterization were performed by XRD and optical microscopy. Structural and morphological differences observed by XRD and optical microscopy shown that PHB/OMMT microcapsules are smaller than PHB/MMT microcapsules, with average size diameter ranging similar to 49 m. Results indicate that PHB/OMMT microcapsules present more defects and fractures than PHB/MMT microcapsules. (AU)

• Processo FAPESP: 12/51871-9 - Estudo de novas tecnologias e rotas de processamento para o tratamento e reciclagem de resíduos sólidos
• Beneficiário: Jorge Alberto Soares Tenório
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 11/50027-7 - Purificação, reologia, caracterização minerológica e modificação de argilas brasileiras para uso em cosméticos, fármacos e outros produtos de alto valor agregado
• Beneficiário: Francisco Rolando Valenzuela Diaz
• Modalidade de apoio: Auxílio à Pesquisa - Regular