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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

Texto completo
Autor(es):
Reis, K. C. [1, 2] ; Canevarolo, S. V. [1]
Número total de Autores: 2
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
Número total de Afiliações: 2
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
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 08/53506-0 - Preparação e monitoramento in-line da produção de nanocompósitos polipropileno/ argila organofílica no estado fundido
Beneficiário:Kelen Cristina dos Reis
Linha de fomento: Bolsas no Brasil - Pós-Doutorado