Biopolymer-clay nanocomposites: cassava starch and synthetic clay cast films

Autor(es)

Gustavo F. Perotti ^[1] ; Jairo Tronto ^[2] ; Marcos A. Bizeto ^[3] ; Celly M. S. Izumi ^[4] ; Marcia L. A. Temperini ^[1] ; Ademar B. Lugão ^[6] ; Duclerc F. Parra ^[6] ; Vera R. L. Constantino ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05508000 Sao Paulo - Brazil

^[2] Univ Fed Vicosa, Inst Ciencias Exatas & Tecnol, BR-38810000 Rio Paranaiba, MG - Brazil

^[3] Univ Fed Sao Paulo, Inst Ciencias Ambientais Quim & Farmaceut, Dept Ciencias Exatas & Terra, BR-09913030 Diadema, SP - Brazil

^[4] Univ Fed Juiz de Fora, Dept Quim, Nucleo Espectroscopia & Estrutura Mol, BR-36036900 Juiz De Fora, MG - Brazil

^[5] Instituto de Pesquisas Energéticas e Nucleares. Centro de Química e Meio Ambiente - Brasil

^[6] Ctr Quim & Meio Ambiente, Inst Pesquisas Energet & Nucl, BR-05508900 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 25, n. 2, p. 320-330, 2014-02-00.

Resumo

Polymer-clay nanocomposites (PCN) based on cassava starch, synthetic hectorite clay and inverted sugar cane syrup (plasticizer) were prepared by solvent-assisted (casting) process producing transparent and homogeneous films. Small amounts of clay (5-15 wt.%) resulted mainly in exfoliated nanocomposites while large amounts (30 wt.%) promote the intercalated nanocomposites formation. FT-Raman bands sensitive to hydrogen bonding in starch granules are progressively shifted to lower wavenumbers as the clay content is raised. Nanocomposites show a similar thermal behavior up to 320 ºC while the biomolecule decomposition at about 500 ºC is dependent on the clay content. CO2 release at about 300 ºC (non-oxidative decomposition of polymeric chains) decreases if compared to the gas delivery at ca. 500 ºC, as the clay content is increased. Films with clay content higher than 10 wt.% show no substantial benefit for either elongation or resistance properties. (AU)

• Processo FAPESP: 11/50318-1 - Desenvolvimento de compostos com interesse farmacológico ou medicinal e de sistemas para seu transporte, detecção e reconhecimento no meio biológico
• Beneficiário: Ana Maria da Costa Ferreira
• Modalidade de apoio: Auxílio à Pesquisa - Temático