Linear viscoelastic behavior of compatibilized PMMA/PP blends

Authors

  • Adriana Martinelli Catelli de Souza,

    1. Metallurgical and Materials Engineering Department, Escola Politécnica, Universidade de São Paulo, Av. Professor Mello Moraes, 2463 CEP 05508-900 São Paulo, SP, Brazil
    Current affiliation:
    1. Materials Engineering Department, Centro Universitário da FEI, Av. Humberto de Alencar Castelo Branco, 3972 CEP 09850-901 São Bernardo do Campo, SP, Brazil
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  • Patrícia Schmid Calvão,

    Corresponding author
    1. Metallurgical and Materials Engineering Department, Escola Politécnica, Universidade de São Paulo, Av. Professor Mello Moraes, 2463 CEP 05508-900 São Paulo, SP, Brazil
    • Metallurgical and Materials Engineering Department, Escola Politécnica, University of São Paulo, CEP 05508-900, São Paulo, SP, Brazil
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  • Nicole Raymonde Demarquette

    Corresponding author
    1. Metallurgical and Materials Engineering Department, Escola Politécnica, Universidade de São Paulo, Av. Professor Mello Moraes, 2463 CEP 05508-900 São Paulo, SP, Brazil
    Current affiliation:
    1. Département de Génie Mécanique, Ecole de Technologie Supérieure, 1100 Notre-Dame Ouest, H3C 1K3 Montreal, Canada
    • Metallurgical and Materials Engineering Department, Escola Politécnica, University of São Paulo, CEP 05508-900, São Paulo, SP, Brazil
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Abstract

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. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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