Abstract
The peculiarities of uniaxial deformation of semicrystalline polyolefins were studied using high-density polyethylene and isotactic polypropylene as an example in carbon dioxide at 35–75°C and pressures of 0.1–30 MPa. A nanoporous structure (with pore diameters of 3–7 nm) started to form in polymer films by the delocalized crazing mechanism at 4–5 MPa and higher. The increment of the pore volume depends on the parameters (pressure, temperature, and density) of the medium and on the deformation of the polymer, reaching 30–70%. The pore formation by the crazing mechanism was most effective when CO2 was in the supercritical state at a nearly critical temperature (35°C) and its density approached the density of a liquid.
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Original Russian Text © E.S. Trofimchuk, A.V. Efimov, L.N. Nikitin, N.I. Nikonorova, A.L. Volynskii, A.R. Khokhlov, N.F. Bakeev, 2013, published in Sverkhkriticheskie Flyuidy: Teoriya i Praktika, 2013, Vol. 8, No. 4, pp. 36–45.
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Trofimchuk, E.S., Efimov, A.V., Nikitin, L.N. et al. Preparation of nanoporous polyolefin films in supercritical carbon dioxide. Russ. J. Phys. Chem. B 8, 1019–1024 (2014). https://doi.org/10.1134/S199079311408017X
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DOI: https://doi.org/10.1134/S199079311408017X