Publikation: Geomimetics for green polymer synthesis : highly ordered polyimides via hydrothermal techniques
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Inspired by geological ore formation processes, we apply one-step hydrothermal (HT) polymerization to the toughest existing high-performance polymer, poly(p-phenyl pyromellitimide) (PPPI). We obtain highly-ordered and fully imidized PPPI as crystalline flakes and flowers on the micrometer scale. In contrast to classical 2-step procedures that require long reaction times and toxic solvents and catalysts, HT polymerization allows for full conversion in only 1 h at 200 °C, in nothing but hot water. Investigation of the crystal growth mechanism via scanning electron microscopy (SEM) suggests that PPPI aggregates form via a dissolution–polymerization–crystallization process, which is uniquely facilitated by the reaction conditions in the HT regime. A conventionally prefabricated polyimide did not recrystallize hydrothermally, indicating that the HT polymerization and crystallization occur simultaneously. The obtained material shows excellent crystallinity and remarkable thermal stability (600 °C under N2) that stem from a combination of a strong, covalent polymer backbone and interchain hydrogen bonding.
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BAUMGARTNER, Bettina, Michael J. BOJDYS, Miriam M. UNTERLASS, 2014. Geomimetics for green polymer synthesis : highly ordered polyimides via hydrothermal techniques. In: Polymer Chemistry. Royal Society of Chemistry (RSC). 2014, 5(12), pp. 3771-3776. ISSN 1759-9954. eISSN 1759-9962. Available under: doi: 10.1039/C4PY00263FBibTex
@article{Baumgartner2014Geomi-54858, year={2014}, doi={10.1039/C4PY00263F}, title={Geomimetics for green polymer synthesis : highly ordered polyimides via hydrothermal techniques}, number={12}, volume={5}, issn={1759-9954}, journal={Polymer Chemistry}, pages={3771--3776}, author={Baumgartner, Bettina and Bojdys, Michael J. and Unterlass, Miriam M.} }
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