Publikation: Design Strategies in Hydrothermal Polymerization of Polyimides
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2016
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Macromolecular Chemistry and Physics. Wiley-Blackwell. 2016, 217(3), pp. 485-500. ISSN 1022-1352. eISSN 1521-3935. Available under: doi: 10.1002/macp.201500287
Zusammenfassung
Hydrothermal polymerization (HTP) is a technique to synthesize highly crystalline polyimides in solely water. The process involves monomer salt intermediates also able to undergo other polymerizations during the HTP experiment: sub-hydrothermal polymerization (sHTP) and solid-state polycondensation (SSP). Both processes yield semicrystalline polyimides at best. This is widely believed to result from irreversible bond-formation and the incorporation of conformational defects during chain growth. Here, microwave-assisted HTP is used, allowing for controlling the heating time to the reaction temperature, and thus to strongly reduce sHTP. Moreover, we show that highest crystallinity can be obtained in the higher hydrothermal regime (≈200 °C), and synthesize two polyimides of sufficient crystallinity to refine their crystal structures from powder X-ray diffraction data. This study brings us one step closer to a general picture and rational design of the hydrothermal synthesis of polyimides.
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BAUMGARTNER, Bettina, Michael J. BOJDYS, Philipp SKRINJAR, Miriam M. UNTERLASS, 2016. Design Strategies in Hydrothermal Polymerization of Polyimides. In: Macromolecular Chemistry and Physics. Wiley-Blackwell. 2016, 217(3), pp. 485-500. ISSN 1022-1352. eISSN 1521-3935. Available under: doi: 10.1002/macp.201500287BibTex
@article{Baumgartner2016Desig-54857,
year={2016},
doi={10.1002/macp.201500287},
title={Design Strategies in Hydrothermal Polymerization of Polyimides},
number={3},
volume={217},
issn={1022-1352},
journal={Macromolecular Chemistry and Physics},
pages={485--500},
author={Baumgartner, Bettina and Bojdys, Michael J. and Skrinjar, Philipp and Unterlass, Miriam M.}
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<dcterms:abstract xml:lang="eng">Hydrothermal polymerization (HTP) is a technique to synthesize highly crystalline polyimides in solely water. The process involves monomer salt intermediates also able to undergo other polymerizations during the HTP experiment: sub-hydrothermal polymerization (sHTP) and solid-state polycondensation (SSP). Both processes yield semicrystalline polyimides at best. This is widely believed to result from irreversible bond-formation and the incorporation of conformational defects during chain growth. Here, microwave-assisted HTP is used, allowing for controlling the heating time to the reaction temperature, and thus to strongly reduce sHTP. Moreover, we show that highest crystallinity can be obtained in the higher hydrothermal regime (≈200 °C), and synthesize two polyimides of sufficient crystallinity to refine their crystal structures from powder X-ray diffraction data. This study brings us one step closer to a general picture and rational design of the hydrothermal synthesis of polyimides.</dcterms:abstract>
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