| People | Locations | Statistics |
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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
Places of action
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article
Sensing the glass transition in thin and ultrathin polymer films via fluorescence probes and labels
Abstract
<p>Fluorescence was used to characterize the glass transition in thin and ultrathin supported polymer films with common chromophores. The temperature dependence of the fluorescence intensity exhibits a transition or break upon cooling from the rubbery state to the glassy state, and this is identified as the glass transition. A variety of chromophores are investigated including pyrene, anthracene, and phenan-threne either as dopants, covalently attached to the polymer as a label, or both. The particular choice of the chromophore as well as the nature of the attachment, in the case of labels, have significant impact on the success of this method. Problematic cases include those in which the excited-state chromophore undergoes significant photochemistry in addition to fluorescence or those in which the particular attachment of the chromophore as a label may allow for conformational interactions that affect the fluorescence quantum yield in a nontrivial way. Polymers that have an intrinsic fluorescence unit, for example, polystyrene, may allow for the fluorescence sensing of the glass transition without added dopants or labels. Finally, it is demonstrated that this technique holds promise for the study of the glass transition in polymer blends and within specific locations in multilayer films.</p>