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The influence of interfacial interactions on the morphology and thermal properties of binary polymer blends

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Abstract

In order to understand the influence of interfacial modification in polyamide/ionomer/ polypropylene ternary blends, the binary blends were investigated. In this study two multiphase blends have been chosen, PP/ionomer and PA/ionomer, where the ionomer was a copolymer of polyethylene and of a mixture of methacrylic acid, zinc methacrylate and isobutylacrylate. The PP/ionomer blend is a classic example of an incompatible system which displays a high degree of interfacial voiding in SEM fracture surfaces, a strong negative deviation from additivity in the viscosity/composition relationship and an important coalescence effect on increasing dispersed phase concentration. This blend demonstrated increased nucleation and crystallization rate, compared to pure polypropylene. The second blend, PA/ionomer, demonstrates a very fine multiphase structure evident only after microtoming/etching of the sample, strong additive behaviour in the viscosity/composition curve. Formation of an amide bond was identified by Fourier transform-infrared spectroscopy. This evidence supports the conclusion that much stronger interactions exist between the ionomer and the polyamide than between the ionomer and the polypropylene.

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Author notes

  1. J. M. Willis

    Present address: DuPont Canada Inc., K7L 5A5, Kingston, Ontario, Canada

  2. B. D. Favis

    Present address: Department of Chemical Engineering, École Polytechnique de Montréal, 2900, Edouard-Montpetit, Succ. A, C.P. 6079, H3C 3A7, Montreal, Quebec, Canada

Authors and Affiliations

  1. Industrial Materials Institute, National Research Council of Canada, J4B 6Y4, Boucherville, Quebec, Canada

    J. M. Willis, B. D. Favis & C. Lavallée

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  1. J. M. Willis
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  2. B. D. Favis
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  3. C. Lavallée
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Willis, J.M., Favis, B.D. & Lavallée, C. The influence of interfacial interactions on the morphology and thermal properties of binary polymer blends. J Mater Sci 28, 1749–1757 (1993). https://doi.org/10.1007/BF00595741

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