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Thermoplastic corn starch with 0.4 parts by weight of sorbitol plasticizer was studied using dynamic‐mechanical thermal analysis (DMTA) and hydrogen nuclear magnetic resonance (1H NMR) to assess the changes in molecular mobility during a period of 26 weeks of storage. Motional heterogeneity of this thermoplastic starch (TPS) was found even after a short aging time by means of DMTA. Besides the glass transition processes in starch‐rich and plasticizer‐rich domains, other relaxation processes appear in TPS samples aged for a longer time. Sorbitol release and/or some moisture uptake was observed in 1H NMR spectra of long‐aged samples. After the whole monitored aging period, sample surfaces were covered with white powder due to sorbitol leakage from the TPS structure.
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Fričová et al. (2022) studied this question.
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