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Stress relaxation behavior of PMMA/PS polymer blends

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Abstract

In this work, the stress relaxation behavior of PMMA/PS blends, with or without random copolymer addition, submitted to step shear strain experiments in the linear and nonlinear regime was studied. The effect of blend composition (ranging from 10 to 30 wt.% of dispersed phase), viscosity ratio (ranging from 0.1 to 7.5), and random copolymer addition (for concentrations up to 8 wt.% with respect to the dispersed phase) was evaluated and correlated to the evolution of the morphology of the blends. All blends presented three relaxation stages: a first fast relaxation which was attributed to the relaxation of the pure phases, a second one which was characterized by the presence of a plateau, and a third fast one. The relaxation was shown to be faster for less extended and smaller droplets and to be influenced by coalescence for blends with a dispersed phase concentration larger than 20 wt.%. The relaxation of the blend was strongly influenced by the matrix viscosity. The addition of random copolymer resulted in a slower relaxation of the droplets.

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Acknowledgements

The authors would like to thank FAPESP, CNPq, and CAPES for the financial support.

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Authors and Affiliations

  1. Metallurgical and Materials Engineering Department, Escola Politécnica—University of São Paulo, Av. Prof. Mello Moraes, 2463, CEP 05508-900, São Paulo, SP, Brazil

    Márcio Yee, Adriana M. C. Souza, Ticiane S. Valera & Nicole R. Demarquette

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  1. Márcio Yee
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  2. Adriana M. C. Souza
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  3. Ticiane S. Valera
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  4. Nicole R. Demarquette
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Correspondence to Nicole R. Demarquette.

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Yee, M., Souza, A.M.C., Valera, T.S. et al. Stress relaxation behavior of PMMA/PS polymer blends. Rheol Acta 48, 527–541 (2009). https://doi.org/10.1007/s00397-009-0349-9

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  • DOI: https://doi.org/10.1007/s00397-009-0349-9

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