Collection of scientific works Nanosystems, nanomaterials, nanotechnologies Year 2024 Volume 22, Issue 4
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L.O. VORONTSOVA, N.V. BABKINA, O.I. ANTONENKO, L.F. KOSYANCHUK, and O.O. BROVKO

Effect of Nano-SiO2 Content on Optical Properties, Damping, and Thermal Stability of Polyurethane Composites
915–928 (2024)

PACS numbers: 62.23.Pq, 62.25.De, 78.67.Sc, 81.07.Pr, 81.16.Be, 81.70.Pg, 82.35.Np

Polyurethane (PU) matrices based on polyester and aromatic diisocyanate with a content of 1, 3, 5, 7 wt.% nano-SiO2 were formed by the in situ method and investigated to determine the optimal composition of PU nanocomposite with a balanced combination of such functional characteristics as transparency, UV protection, damping, and thermal stability. The spectrophotometry method showed that the initial PU matrix and formed PU nanocomposites demonstrate a high (??90%) transmittance in the range of visible wavelengths. At the same time, the PU matrix is characterized by effective blocking of UV radiation with a wavelength of up to ??290 nm, but a bathochromic shift (up to ??315 nm) of the transmission spectra is observed for filled PUs. According to thermogravimetric analysis, the thermal stability of PU composites increases, when nanosize SiO2 is introduced into the matrix. The operating temperature range for this composite is increased by almost 30?Ñ, when the filler content is of 5–7 wt.%. The high damping efficiency of the investigated PUs is shown by the method of dynamic mechanical analysis. PU composite with a content of 7 wt.% nano-SiO2 has a 1.5-fold increase in storage modulus and effective damping temperature range from ?6?Ñ to 47?Ñ. As concluded, the optimal content of nano-SiO2 is of 7 wt.% to provide a balanced combination of such properties as transparency, UV protection, thermal stability, elasticity, and effective damping for PU composite

KEY WORDS: polyurethane, nanocomposite, transparency, ultraviolet protection, damping, thermal stability

DOI:  https://doi.org/10.15407/nnn.22.04.915

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