Crazing of Isotactic Polypropylene in the Medium of Supercritical Carbon Dioxideстатья
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Дата последнего поиска статьи во внешних источниках: 19 декабря 2019 г.
Аннотация: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 degrees 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 similar to 10 nm; the specific surface of the craze fibrils is 100-150 m(2)/cm(3). DOI: 10.1134/S0965545X11050154