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International Journal of Polymer Analysis and Characterization Volume 25, 2020 - Issue 4
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Influence of aging on molecular motion in PBAT-thermoplastic starch blends studied using solid-state NMR

Oľga FričováFaculty of Electrical Engineering and Informatics, Department of Physics, Technical University of Košice, Košice, SlovakiaCorrespondence[email protected]
ORCID Iconhttp://orcid.org/0000-0003-4355-3919View further author information
ORCID Icon,
Mária HutníkováFaculty of Electrical Engineering and Informatics, Department of Physics, Technical University of Košice, Košice, SlovakiaView further author information
,
Mária KovaľakováFaculty of Electrical Engineering and Informatics, Department of Physics, Technical University of Košice, Košice, SlovakiaView further author information
&
Anton BaranFaculty of Electrical Engineering and Informatics, Department of Physics, Technical University of Košice, Košice, SlovakiaView further author information
Pages 275-282 | Received 19 Nov 2019, Accepted 12 Jun 2020, Published online: 30 Jun 2020
 
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Abstract

The influence of seven-month aging on molecular motion in blends of biodegradable poly(butylene-adipate-co-terephthalate) (PBAT) and corn starch plasticized with water, urea (U) and/or glycerol (G) was studied using solid-state 1H and 13C NMR spectroscopy. Changes in 1H and 13C NMR spectra due to aging in G-containing blends are explained by starch retrogradation. The increasing number of urea-glycerol interactions in the aged UG-containing blend can be deduced from the 1H NMR spectra. The formation of a crystalline phase was not observed in the U-containing blends. The 13C spin-lattice relaxation times and scanning electron microscopy support this interpretation of the NMR spectra.

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Funding

This research was supported by the Slovak Grant Agency (Agentúra Ministerstva školstva, vedy, výskumu a športu SR) through VEGA (project no. 1/0570/17).

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