Avaliação da biodegradabilidade de compósito de poli (ε-caprolactona) e fibra de coco verde

• Autor(a) principal: Couto, Lessandra de Oliveira
• Data de Publicação: 2008
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/15785
• topic: Biodegradation; poly (ε-caprolactona); coconut fiber; composites; acetylation; Biodegradabilidade; poli (ε-caprolactona); fibra de coco; compósitos; acetilação; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ORGANICA

In this work were prepared composites of poly (ε-caprolactone) and fibers from green coconut, which was treated by acetylation. Were studied the Biodegradation of PCL pure and composites in simulated soil was studied and its thermal and morphological properties were evaluated. The biodegradability test was carried out burying samples in simulated soil for periods ranging from two to seventeen weeks, according to ASTM standard G 160 to 03. After each period of burial, the samples were taken out of the soil and analyzed by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA); optical microscopy (OM); scanning electron microscopy (SEM) and the absorption spectrometry in the infrared region with Fourier transform (FTIR). The composites of PCL/green coconut fiber, with or without chemical modification were considered biodegradable materials in accordance with the standard method employed. The chemical treatment by acetylation was effective in changing the chemical structure and the morphology of coconut fibres. The presence of acetyl groups were confirmed by FTIR and the fiber surface morphology becomes rough. The change generated by the chemical treatment caused an increase of fiber adhesion in PCL matrix