2021
DOI: 10.3390/polym13071008
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Static and Dynamic Behavior of Polymer/Graphite Oxide Nanocomposites before and after Thermal Reduction

Abstract: Nanocomposites of hyperbranched polymers with graphitic materials are investigated with respect to their structure and thermal properties as well as the dynamics of the polymer probing the effect of the different intercalated or exfoliated structure. Three generations of hyperbranched polyester polyols are mixed with graphite oxide (GO) and the favorable interactions between the polymers and the solid surfaces lead to intercalated structure. The thermal transitions of the confined chains are suppressed, wherea… Show more

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Cited by 6 publications
(7 citation statements)
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“…It is noted that similarity in the relaxation times and the temperature dependence of their β-relaxations was anticipated, since this is a very local process that is not significantly affected by spatial confinement unless there are specific interaction in the systems such as the existence of a hydrogen bond network. 25,58,59 Around the glass transition of the polymer, the segmental process emerges as a result of the relaxation of cooperatively rearranging regions of a few repeat units. The temperature dependence of this process appears to follow the Vogel− Fulcher−Tammann (VFT) equation, τ = τ 0,α exp[A/(T − T 0 ))], and is in very good agreement with the values found in literature (also shown as a black line).…”
Section: Desorption Kineticsmentioning
confidence: 99%
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“…It is noted that similarity in the relaxation times and the temperature dependence of their β-relaxations was anticipated, since this is a very local process that is not significantly affected by spatial confinement unless there are specific interaction in the systems such as the existence of a hydrogen bond network. 25,58,59 Around the glass transition of the polymer, the segmental process emerges as a result of the relaxation of cooperatively rearranging regions of a few repeat units. The temperature dependence of this process appears to follow the Vogel− Fulcher−Tammann (VFT) equation, τ = τ 0,α exp[A/(T − T 0 ))], and is in very good agreement with the values found in literature (also shown as a black line).…”
Section: Desorption Kineticsmentioning
confidence: 99%
“…The investigation of the structure, chain conformation, and dynamics of polymer nanocomposites (PNCs) constitutes a very active research area due to the innovative properties of these materials, which make them candidates for a broad range of applications. The properties of polymer chains close to the surface of a nanoadditive or under confinement are different compared to those in the bulk, affecting the overall behavior of the systems. Important advances both in basic research ,,,,, and in different industrial fields have been made on hybrid polymer–nanoparticle systems. Moreover, a number of computational, , experimental, ,,,,,, and combined studies , have been employed to investigate the effects of the presence of the interfaces on the properties of the polymer, providing a measure of the interphase length. ,,,, …”
Section: Introductionmentioning
confidence: 99%
“…Periodic boundary conditions are applied in both x and y directions. Moreover, it is well known that thermal annealing of GO at high temperatures results in its de-oxygenation, that is, the removal of various oxygen species from its layers. , Therefore, GO sheets will be considered a rigid body in MD simulations to prevent large deformation and to weaken the effect of thermal fluctuation.…”
Section: Theoretical Models and MD Simulationsmentioning
confidence: 99%
“…Water molecules, other polar moieties as well as polar hydrophilic polymers can interact favorably with the surfaces due to their hydrophilicity and reside within the galleries 19 giving rise to the formation of hydrophilic polymer nanocomposites. 20–23…”
Section: Introductionmentioning
confidence: 99%
“…Water molecules, other polar moieties as well as polar hydrophilic polymers can interact favorably with the surfaces due to their hydrophilicity and reside within the galleries 19 giving rise to the formation of hydrophilic polymer nanocomposites. [20][21][22][23] The main method to fabricate graphene oxide is the oxidation of the natural graphite by utilizing strong oxidation agents. The first methods used were performed initially by Brodie 24 and then by Staudenmaier 25 using nitric acid; however, sodium oxide was formed as a by-product and a relatively long time was necessary to complete the reaction.…”
Section: Introductionmentioning
confidence: 99%