Wyszukiwarka
Local Conformation and Cocrystallization Phenomena in Renewable Diaminoisoidide-Based Polyamides Studied by FT-IR, Solid State NMR, and WAXD
Abstrakt
Biobased polyamides synthesized from diaminoisoidide (DAII), 1,4-diaminobutane, and sebacic acid are investigated by FT-IR, 13C{1H} magic-angle spinning/cross-polarization (CP/MAS) NMR spectroscopy, and WAXD. Their molecular conformation and mobility undergo distinct changes as a function of temperature and diaminoisoidide content in the compositions. The presence of randomly distributed diaminoisoidide (DAII) in the polyamides reduces their hydrogen bond density and affects the trans/gauche conformer population. FT-IR and 13C{1H} CP/MAS NMR were successfully employed to prove the incorporation of DAII both in the crystalline and amorphous phase of these materials. Changes in the position and intensities of the diaminoisoidide-assigned FT-IR and NMR signals prove that the DAII monomer causes a conformational disorder of the polyamides and thus influences the crystal structure of these materials, as also shown by WAXD experiments. Extensive ab initio calculations using a combination of DFT and MP2 methods reveal a number of stable conformers of DAII and thus an unexpectedly high flexibility of the isohexide unit.
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Informacje szczegółowe
- Kategoria:
- Publikacja w czasopiśmie
- Typ:
- artykuł w czasopiśmie wyróżnionym w JCR
- Opublikowano w:
-
MACROMOLECULES
nr 45,
ISSN: 0024-9297 - Język:
- angielski
- Rok wydania:
- 2012
- Opis bibliograficzny:
- Jasińska-Walc L., Villani M., Dudenko D., Van Asselen O., Klop E., Rastogi S., Ryan Hansen M., Koning C.: Local Conformation and Cocrystallization Phenomena in Renewable Diaminoisoidide-Based Polyamides Studied by FT-IR, Solid State NMR, and WAXD// MACROMOLECULES. -Vol. 45, nr. iss. 6 (2012),
- DOI:
- Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1021/ma300133d
- Weryfikacja:
- Politechnika Gdańska
wyświetlono 226 razy
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