Rheological properties of polyethylene/metaboric acid thermoplastic blends |
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Authors: | Sergei O Ilyin Alexander Y Malkin Valery G Kulichikhin Alexander Yu Shaulov Elena V Stegno Alexander A Berlin Stanislav A Patlazhan |
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Institution: | 1. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninski pr, 119991, Moscow, Russia 2. Semenov Institute of Chemical Physics, Russian Academy of Sciences, 4 Kosygin Street, 119991, Moscow, Russia
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Abstract: | The rheological properties of molten low-density polyethylene/metaboric acid blends were studied. It was found that the blend behavior can be rather different, depending on volume fraction of the inorganic component. Specifically, at some concentration of metaboric acid, the dynamic moduli and the Newtonian viscosity of the blends demonstrate a jump-like change. The concentration threshold depends on temperature and equals to 21.9 and 14.1 vol %, at 150 and 180 °C, respectively. In the concentration range below the threshold, the gain in the content of inorganic component results in an enhancement of the blend dynamic moduli and viscosity, without changing the general character of the rheological behavior of composition in the region of linear response. On the other hand, at higher concentrations of metaboric acid, the yield stress is observed, and the elastic modulus in the linear region of mechanical behavior becomes virtually independent of frequency. It was suggested that the rheological behavior of blends is related to a spontaneous change in their structure as well as planar molecular structure of the inorganic component. |
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