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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Torkelson, John M.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (14/14 displayed)
- 2022Functional enzyme–polymer complexescitations
- 2011Effect of gradient sequencing on copolymer order-disorder transitionscitations
- 2009Melt rheology and x-ray analysis of gradient copolymers
- 2009Glass transition breadths and composition profiles of weakly, moderately, and strongly segregating gradient copolymerscitations
- 2008Microphase separation and shear alignment of gradient copolymerscitations
- 2006Confinement, composition, and spin-coating effects on the glass transition and stress relaxation of thin films of polystyrene and styrene-containing random copolymerscitations
- 2005Impacts of polystyrene molecular weight and modification to the repeat unit structure on the glass transition-nanoconfinement effect and the cooperativity length scalecitations
- 2005On the glass transition and physical aging in nanoconfined polymers
- 2004Erratumcitations
- 2004Effects of free-surface and interfacial layers and plasticizer content on the distribution of glass transition temperatures in nanoconfined polymers
- 2004Dramatic reduction of the effect of nanoconfinement on the glass transition of polymer films via addition of small-molecule diluentcitations
- 2004In situ monitoring of sorption and drying of polymer films and coatingscitations
- 2003The distribution of glass-transition temperatures in nanoscopically confined glass formerscitations
- 2002Sensing the glass transition in thin and ultrathin polymer films via fluorescence probes and labelscitations
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article
The distribution of glass-transition temperatures in nanoscopically confined glass formers
Abstract
<p>Despite the decade-long study of the effect of nanoconfinement on the glass-transition temperature (T<sub>g</sub>) of amorphous materials, the quest to probe the distribution of T<sub>g</sub>S in nanoconfined glass formers has remained unfulfilled. Here the distribution of T<sub>g</sub>s across polystyrene films has been obtained by a fluorescence/multilayer method, revealing that the enhancement of dynamics at a surface affects T<sub>g</sub> several tens of nanometres into the film. The extent to which dynamics smoothly transition from enhanced to bulk states depends strongly on nanoconfinement. When polymer films are sufficiently thin that a reduction in thickness leads to a reduction in overall T<sub>g</sub>, the surface-layer T<sub>g</sub> actually increases with a reduction in overall thickness, whereas the substrate-layer T<sub>g</sub> decreases. These results indicate that the gradient in T<sub>g</sub> dynamics is not abrupt, and that the size of a cooperatively rearranging region is much smaller than the distance over which interfacial effects propagate.</p>