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Morphology estimation from normal stress measurements for dilute immiscible polymer blends

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Abstract.

A method to obtain gross blend morphological information from normal stress measurements is proposed. The blend consists of Newtonian and immiscible constituents in dilute conditions. It is shown that a master curve for the first normal stress difference (N1) can be readily obtained either theoretically or experimentally. The curve is parametric in the viscosity ratio, and relates the actual capillary number to the dimensionless interfacial stress. As a consequence, N1 data determine a capillary number through which a characteristic dimension of the morphology can be estimated. Since globular morphology is typical in dilute conditions, as an example the master curve is here calculated by using a phenomenological model to describe single drop deformation. Morphology predictions are compared with experimental data found in the literature; the comparisons give satisfactory results even up to intermediate concentrations.

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Acknowledgements.

This work was partially funded by MURST PRIN 2000 "Miscele di polimeri termoplastici incompatibili". Fruitful discussions with Francesco Greco are warmly acknowledged.

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Authors and Affiliations

  1. Dipartimento di Ingegneria Aerospaziale e Meccanica, Seconda Universitá di Napoli, Real Casa dell'Annunziata, via Roma 29, 81031 Aversa (CE), Italia

    Mario Minale

  2. Dipartimento di Scienza dei Materiali ed Ingegneria Chimica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italia

    Pier Luca Maffettone

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  1. Mario Minale
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  2. Pier Luca Maffettone
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Correspondence to Mario Minale.

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Minale, M., Maffettone, P.L. Morphology estimation from normal stress measurements for dilute immiscible polymer blends. Rheol Acta 42, 158–165 (2003). https://doi.org/10.1007/s00397-002-0267-6

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  • DOI: https://doi.org/10.1007/s00397-002-0267-6

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