Repositório do Conhecimento Institucional do Centro Universitário FEI
 

Engenharia de Materiais

URI permanente desta comunidadehttps://repositorio.fei.edu.br/handle/FEI/17

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2013 - 20172

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Autor: search.filters.author.Calvao P.S.

Resultados da Pesquisa

Agora exibindo 1 - 2 de 2
  • N/D
    Artigo 19 Citação(ões) na Scopus
    Linear viscoelastic behavior of compatibilized PMMA/PP blends
    (2013) De Souza A.M.C.; Calvao P.S.; Demarquette N.R.
    In this work, the morphology and linear viscoelastic behavior of PMMA/PP blends to which a graft copolymer PP-g-PMMA has been added was studied. The copolymer concentration varied from 1 to 10 wt % relative to the dispersed phase concentration. The rheological data were used to infer the interfacial tension between the blended components. It was observed that PP-g-PMMA was effective as a compatibilizer for PMMA/PP blends. For PP-g-PMMA concentration added below the critical concentration of interface saturation, two rheological behaviors were observed depending on the blend concentration: for 70/30 blend, the storage modulus, at low frequencies, increased as compared to the one of the unmodified blend; for 90/10 blend, it decreased. For 90/10 blend, the relaxation spectrum presented an interfacial relaxation time related to the presence of the compatibilizer (τβ). For PP-g-PMMA concentrations added above the critical concentration of interface saturation, the storage modulus of all blends increased as compared with the one of the unmodified blend. Copyright © 2012 Wiley Periodicals, Inc.
  • N/D
    Artigo 74 Citação(ões) na Scopus
    Effect of montmorillonite and chain extender on rheological, morphological and biodegradation behavior of PLA/PBAT blends
    (2017) Freitas A.L.P.D.L.; Tonini Filho L.R.; Calvao P.S.; Souza A.M.C.D.
    © 2017 Elsevier LtdThe effect of montmorillonite clay (MMT) and/or chain extender (CE) on rheological, morphological and biodegradation properties of PLA/PBAT blend was investigated. The biodegradation behavior was evaluated by CO2 evolution in soil burial. CE incorporation resulted in an increase in the complex viscosity of PLA/PBAT blends, an increase in PLA crystallinity and a decrease in the dispersed phase diameter. MMT incorporation resulted in an increase in the complex viscosity, more pronounced shear-thinning behavior and a decrease in the dispersed phase diameter. CE incorporation resulted in a slight effect in the rheological properties of PLA/PBAT blend in the presence of MMT. Unfilled PLA/PBAT blend presented the highest amount of evolved CO2, and the micrographs indicated that degradation tends to occur on the surface. MMT delayed biodegradation of PLA/PBAT blends even although their surfaces presented some cracks and holes in a few localized regions. PLA/PBAT + CE blend presented the lowest amount of evolved CO2.