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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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Laaksonen, Timo Johannes
University of Helsinki
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2024The role of hard and soft segments in the thermal and mechanical properties of non-isocyanate polyurethanes produced via polycondensation reactioncitations
- 2023Triplet sensitization enables bidirectional isomerization of diazocine with 130 nm redshift in excitation wavelengthscitations
- 2023Cyclic carbonates as building blocks for non-isocyanate polyurethanescitations
- 2021Hydrolytic stability of polyurethane/polyhydroxyurethane hybrid adhesivescitations
- 2020Feasibility of polyamines and cyclic carbonate terminated prepolymers in polyurethane/polyhydroxyurethane synthesiscitations
- 2018Pectin and Mucin Enhance the Bioadhesion of Drug Loaded Nanofibrillated Cellulose Filmscitations
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article
Cyclic carbonates as building blocks for non-isocyanate polyurethanes
Abstract
Three different cyclic carbonates (ethylene, propylene, and butylene carbonate) that can be derived from CO 2 were successfully polymerized with hexamethylenediamine to form non-isocyanate polyurethanes (NIPUs) via self-polycondensation route without the use of harmful di-isocyanates. Three different catalysts were compared for their performance in self-polycondensation. Increasing the side chain length in cyclic carbonate increased the amount of urea side reaction and decreased the solubility of the final product. The increased amount of urea lead to a more thermoset behavior as the melting and decomposition took place simultaneously. Furthermore, the extent of urea side reaction and melting behavior were adjustable with the selection of the catalyst or polymerization parameters. With ethylene and propylene carbonate based precursors, it was possible to obtain promising melting temperatures and lap shear strength for the NIPUs when optimized polymerization parameters and catalyst were used.