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| Naji, M. |
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| Motta, Antonella |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Rančić, M. |
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| Azevedo, Nuno Monteiro |
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| Rignanese, Gian-Marco |
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Anthuparambil, Nimmi Das
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Publications (5/5 displayed)
- 2023Microscopic temperature-dependent structural dynamics in polymer nanocomposites: role of the graft–matrix chain interfacial entropic effectcitations
- 2022Kinetics of high density functional polymer nanocomposite formation by tuning enthalpic and entropic barrierscitations
- 2019Viscosity and fragility of confined polymer nanocomposites: a tale of two interfacescitations
- 2018Interfacial Entropic Interactions Tunes Fragility and Dynamic Heterogeneity of Glassy Athermal Polymer Nanocomposite films
- 2018Nanoparticle–polymer interfacial layer properties tune fragility and dynamic heterogeneity of athermal polymer nanocomposite filmscitations
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document
Interfacial Entropic Interactions Tunes Fragility and Dynamic Heterogeneity of Glassy Athermal Polymer Nanocomposite films
Abstract
Enthalpic interactions at the interface between nanoparticles and matrix polymers is known to influence various properties of the resultant polymer nanocomposites (PNC). For athermal PNCs, consisting of grafted nanoparticles embedded in chemically identical polymers, the role and extent of the interface layer (IL) interactions in determining the properties of the nanocomposites is not very clear. Here, we demonstrate the influence of the interfacial layer dynamics on the fragility and dynamical heterogeneity (DH) of athermal and glassy PNCs. The IL properties are altered by changing the grafted to matrix polymer size ratio, f, which in turn changes the extent of matrix chain penetration into the grafted layer. The fragility of PNCs is found to increase monotonically with increasing entropic compatibility, characterized by increasing penetration depth. Contrary to observations in most polymers and glass formers, we observe an anti-correlation between the dependence on IL dynamics of fragility and DH, quantif ied by the experimentally estimated Kohlrausch-Watts-Williams parameter and the non-Gaussian parameter obtained from simulations.