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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 21: Poster II

CPP 21.11: Poster

Dienstag, 19. März 2024, 18:00–20:00, Poster E

Semicrystallinity in vitrimers studied by solid-state NMR — Kay Saalwächter and •Fatemeh Fouladi — Institut für Physik - NMR, Betty-Heimann-Str. 7, Martin-Luther Univeristät Halle-Wittenberg, 06120 Halle, Germany

In this study, we investigate the crystalline nature of vitrimer samples with catalyst-controlled bond dynamics by time-domain NMR. The studied vitrimer samples, synthesized by various catalysts to control bond exchange kinetics, feature covalent adaptable networks (CANs) intricately crosslinked through dynamic covalent bonds. The aim is to explore how vitrimeric exchanges influence crystallinity and identify the maximum attainable crystallinity. Specifically, crystallization kinetics was investigated via low-field 1H NMR. The structural diversity in our sample raises questions about the crystallization of alkyl chains or the potential involvement of ester/thioester groups in crystal formation, which is answered by 13C MAS NMR.

Keywords: polymer crystallization; crystallization kinetics; covalent adaptable networks; solid state NMR