Evaluation of the structure of polypropylene/montmorillonite nanocomposite by in-line light extinction and color measurements during multiple extrusions

Autor(es)

Reis, K. C. ^{[1, 2]} ; Canevarolo, S. V. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Engn Mat DEMa UFSCar, BR-13565905 Sao Paulo - Brazil

^[2] Univ Fed Lavras UFLA, Dept Ciencia Alimentos DCA, BR-37200000 Lavras, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: POLYMER ENGINEERING AND SCIENCE; v. 52, n. 8, p. 1784-1794, AUG 2012.
• Citações Web of Science: 13

Resumo

This work extends the method to follow in real time the reduction of the clay particle size by light extinction measurements (turbidity), obtained via an in-line optical detector fitted at the extruder die exit, to monitor multiple extrusions of PP/MMT nanocomposites. The optical detector was calibrated and showed to follow the Mie Theory. This theory states that the transmitted light intensity decreases for suspension of particles smaller than 500 nm. Corroborating with these results, off-line color measurements has shown that the luminosity decrease and the yellow color increases during multiple extrusions of the nanocomposites. In addition, the color difference and the yellowness indexes of the nanocomposites using organic modified montmorillonite (MMT) are higher then the MMT Na+ (sodium MMT) after multiple extrusions. The addition of clay to a PP matrix produced an increase in the opacity. Results from X-ray do follow the same trend as those obtained from the in-line light extinction measurements. POLYM. ENG. SCI., 2012. (C) 2012 Society of Plastics Engineers (AU)

• Processo FAPESP: 06/61008-5 - Sistemas poliméricos nanoestruturados: processamento e propriedades
• Beneficiário: Rosario Elida Suman Bretas
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 08/53506-0 - Preparacao e monitoramento in-line da producao de nanocompositos polipropileno/ argila organofilica no estado fundido
• Beneficiário: Kelen Cristina dos Reis
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado