TY - JOUR
T1 - Dynamics, thermal behaviour and elastic properties of thin films of poly(vinyl alcohol) nanocomposites
AU - Bershtein, Vladimir A.
AU - Gun'Ko, Vladimir M.
AU - Egorova, Larisa M.
AU - Wang, Zhaowei
AU - Illsley, Matthew
AU - Voronin, Eugeny F.
AU - Prikhod'Ko, Gennadiy P.
AU - Yakushev, Pavel N.
AU - Leboda, Roman
AU - Skubiszewska-Zieba, Jadwiga
AU - Mikhalovsky, Sergey V.
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/2/21
Y1 - 2012/2/21
N2 - A combined differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and laser-interferometric creep rate spectroscopy (CRS) approach has been utilised to study the dynamics, thermal behaviour and elastic properties of thin films (0.05-0.10 mm) with poly(vinyl alcohol) (PVA) based nanocomposites at temperatures ranging from 20 to 180-220 °C. 3D amorphous fumed silica (nanoparticles of ∼9 nm in average diameter, specific surface area S BET = 330 m 2 g -1, bulk density ρ b = 0.045 g cm -3) initial and compacted by mechanochemical activation to ρ b = 0.32 g cm -3 (dense nanosilica with a small change in S BET), and exfoliated graphite (oxidised 2D sheets packed in stacks of approximately 200 nm in thickness) were used as nanofillers of the PVA films at content of 1, 10 or 20 wt%. The impact of nanofillers which significantly modified structure, dynamics and other properties of the PVA matrix due to constrained dynamics effects depends on the filler type and concentration. The most detailed, discrete pictures of the dynamics and pronounced dynamics heterogeneity in the glass transition of the composites were shown by the CRS method. At any temperature within the 20-180 °C range, the composite modules changed by an order of magnitude. Up to a 14 °C rise of the glass transition temperature was observed for the nanocomposites. The most dramatic enhancing effect of elastic and creep resistance properties was attained for a composite incorporating 10 wt% of exfoliated graphite.
AB - A combined differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and laser-interferometric creep rate spectroscopy (CRS) approach has been utilised to study the dynamics, thermal behaviour and elastic properties of thin films (0.05-0.10 mm) with poly(vinyl alcohol) (PVA) based nanocomposites at temperatures ranging from 20 to 180-220 °C. 3D amorphous fumed silica (nanoparticles of ∼9 nm in average diameter, specific surface area S BET = 330 m 2 g -1, bulk density ρ b = 0.045 g cm -3) initial and compacted by mechanochemical activation to ρ b = 0.32 g cm -3 (dense nanosilica with a small change in S BET), and exfoliated graphite (oxidised 2D sheets packed in stacks of approximately 200 nm in thickness) were used as nanofillers of the PVA films at content of 1, 10 or 20 wt%. The impact of nanofillers which significantly modified structure, dynamics and other properties of the PVA matrix due to constrained dynamics effects depends on the filler type and concentration. The most detailed, discrete pictures of the dynamics and pronounced dynamics heterogeneity in the glass transition of the composites were shown by the CRS method. At any temperature within the 20-180 °C range, the composite modules changed by an order of magnitude. Up to a 14 °C rise of the glass transition temperature was observed for the nanocomposites. The most dramatic enhancing effect of elastic and creep resistance properties was attained for a composite incorporating 10 wt% of exfoliated graphite.
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U2 - 10.1039/c1ra00535a
DO - 10.1039/c1ra00535a
M3 - Article
AN - SCOPUS:84859126208
VL - 2
SP - 1424
EP - 1431
JO - RSC Advances
JF - RSC Advances
SN - 2046-2069
IS - 4
ER -