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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
Effect of gradient sequencing on copolymer order-disorder transitions
Abstract
<p>We investigate the effect of gradient sequence distribution in copolymers on order-disorder transitions, using rheometry and small-angle X-ray scattering to compare the phase behavior of styrene/n-butyl acrylate (S/nBA) block and gradient copolymers. Relative to block sequencing, gradient sequencing increases the molecular weight necessary to induce phase segregation by over 3-fold, directly consistent with previous predictions from theory. Results also suggest the existence of both upper and lower order-disorder transitions in a higher molecular weight S/nBA gradient copolymer, made accessible by the shift in order-disorder temperatures from gradient sequencing. The combination of transitions is speculated to be inaccessible in S/nBA block copolymer systems due to their overlap at even modest molecular weights and also their location on the phase diagram relative to the polystyrene glass transition temperature. Finally, we discuss the potential impacts of polydispersity and chain-to-chain monomer sequence variation on gradient copolymer phase segregation.</p>