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- W2777487771 abstract "A number of rigid polyurethane-polyurea nanocomposite foams was synthesized using nanofillers of different nature (hydrophilic (acidic or basic)/hydrophobic-fullerene soot, fullerene soot with hydroxyl groups, aluminum (III) and chromium (III) oxides) at concentrations 0.1–0.6 wt%. Statistical analysis of optical foam images demonstrated that introduction of nanoparticles leads to the increases of average diameter of foam cells and, as result, to increase of thermal conductivity. The mechanical strength of foams increases at introduction of all nanoparticles with the exception of chromium (III) oxide. This can be connected with an antiplasticization effect of nanoparticles on polymer matrix. The dielectric spectroscopy demostrated that Tg values of composites increase in comparison with neat PU. However, the effect of hydrophilic/hydrophobic properties of nanoparticles on secondary relaxations is not well pronounced. The microphase separation in these nanocomposites has been studied using FTIR spectroscopy, but effect of surface properties of nanoadditives on this phenomenon is not detected." @default.
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- W2777487771 date "2018-02-01" @default.
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- W2777487771 title "Rigid polyurethane foams with infused hydrophilic/hydrophobic nanoparticles: Relationship between cellular structure and physical properties" @default.
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- W2777487771 doi "https://doi.org/10.1016/j.eurpolymj.2017.12.036" @default.
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