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Crazing of isotactic polypropylene in the medium of supercritical carbon dioxide

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Abstract

Uniaxial tensile drawing of films based on semicrystalline isotactic PP in the medium of supercritical carbon dioxide at a pressure of 10 MPa and a temperature of 35°C is studied. The tensile drawing of PP is shown to proceed in the homogeneous mode without necking and is accompanied by intense cavitation. The maximum level of porosity is 60 vol %. The porous structure that develops owing to the tensile drawing of the polymer in supercritical CO2 is provided by formation of a set of crazes that are primarily localized in interlamellar regions. According to small-angle X-ray scattering data, the average diameter of fibrils that bridge craze walls changes slightly with an increase in tensile strain and is ∼10 nm; the specific surface of the craze fibrils is 100–150 m2/cm3.

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Authors and Affiliations

  1. Faculty of Chemistry, Moscow State University, Moscow, 119991, Russia

    E. S. Trofimchuk, A. V. Efimov, N. I. Nikonorova, A. L. Volynskii & N. F. Bakeev

  2. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, Moscow, 119991, Russia

    L. N. Nikitin & A. R. Khokhlov

  3. Karpov Institute of Physical Chemistry, ul. Vorontsovo pole 10, Moscow, 105064, Russia

    L. A. Ozerina

Authors
  1. E. S. Trofimchuk
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  2. A. V. Efimov
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  3. N. I. Nikonorova
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  4. A. L. Volynskii
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  5. N. F. Bakeev
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  6. L. N. Nikitin
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  7. A. R. Khokhlov
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  8. L. A. Ozerina
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Correspondence to E. S. Trofimchuk.

Additional information

Original Russian Text © E.S. Trofimchuk, A.V. Efimov, N.I. Nikonorova, A.L. Volynskii, N.F. Bakeev, L.N. Nikitin, A.R. Khokhlov, L.A. Ozerina, 2011, published in Vysokomolekulyarnye Soedineniya, Ser. A, 2011, Vol. 53, No. 7, pp. 1020–1032.

This work was supported by the Russian Foundation for Basic Research (project nos. 10-03-00827 and 10-03-90030); by the Division of Chemistry and Materials Science, Russian Academy of Sciences, under the basic-research program Development of New Metallic, Ceramic, Glassy, Polymeric, and Composite Materials; by the Presidium of the Russian Academy of Sciences (Program P21); by the State Program for Support of Leading Scientific Schools (NSh-4371.2010.3); and under State Contract no. 02.740.11.0143.

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Trofimchuk, E.S., Efimov, A.V., Nikonorova, N.I. et al. Crazing of isotactic polypropylene in the medium of supercritical carbon dioxide. Polym. Sci. Ser. A 53, 546–557 (2011). https://doi.org/10.1134/S0965545X11050154

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  • DOI: https://doi.org/10.1134/S0965545X11050154

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