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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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Franczyk, Adrian
Adam Mickiewicz University in Poznań
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2023Coupling agents with 2,4,6,8-tetramethylcyclotetrasiloxane core – synthesis and application in styrene–butadiene rubber productioncitations
- 2017Dynamic Heterogeneity in Random Copolymers of Polymethacrylates Bearing Different Polyhedral Oligomeric Silsesquioxane Moieties (POSS)citations
- 2015Polymethacrylates with polyhedral oligomeric silsesquioxane (POSS) moieties: Influence of spacer length on packing, thermodynamics, and dynamicscitations
- 2013Polyurethanes modified with functionalized silsesquioxane - Synthesis and propertiescitations
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article
Dynamic Heterogeneity in Random Copolymers of Polymethacrylates Bearing Different Polyhedral Oligomeric Silsesquioxane Moieties (POSS)
Abstract
<p>Random copolymers - usually considered as dynamically homogeneous with a single glass temperature - can show dynamic heterogeneity by appropriate choice of their repeat units. Random copolymers based on polymethacrylates with polyhedral oligomeric silsesquioxane (POSS) moieties as side groups substituted with seven isobutyl ((i-Bu)<sub>7</sub>POSS-OSiMe<sub>2</sub>(CH<sub>2</sub>)<sub>3</sub>-MA) and 2,4,4-trimethylpentyl ((i-C<sub>8</sub>H<sub>17</sub>)<sub>7</sub>POSS-OSiMe<sub>2</sub>(CH<sub>2</sub>)<sub>3</sub>-MA) groups were synthesized and studied by dielectric spectroscopy, density functional theory, differential scanning calorimetry, and rheology. Two distinct relaxation processes were found by dielectric spectroscopy giving rise to two glass temperatures. In addition, rheology revealed significant broadening of the viscoelastic functions leading eventually to the failure of time-temperature superposition for all copolymer compositions. These results provide signatures of dynamic heterogeneity in a random copolymer.</p>