Structural dependence of the molecular mobility in acetylated starch
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Article number | 123371 |
Journal / Publication | Polymer |
Volume | 215 |
Online published | 30 Dec 2020 |
Publication status | Published - 12 Feb 2021 |
Externally published | Yes |
Link(s)
Abstract
In this study, the molecular mobility of acetylated starch (AS) with degree of substitution (DS) 1.5 and 3, representing partial and complete substitution of hydroxyl groups with acetyl groups, was investigated. The glass transition region and the onset of long-range cooperative molecular motions were examined using temperature-modulated-DSC (TMDSC). A potential analogy between the relaxation time of hole formation and the α-relaxation time was observed. The deviation in the temperature dependence of the α-relaxation time from the Arrhenius relationship, obtained with the fragility index, revealed differences according to DS. The cooperative rearranging region (CRR) characteristics differed according to DS and estimation method. Smaller size of the CRR for AS with DS 3 compared to AS with DS 1.5 suggest disruption of hydrogen bonds at high acetylation level. TMDSC experimental data at moderate temperature and predictions and SS-NMR results at ambient temperature, indicate different mobility of AS according to DS and temperature conditions. © 2020 Published by Elsevier Ltd.
Research Area(s)
- Acetylated starch, Fragility index, Molecular mobility, Solids-state NMR, Temperature-modulated DSC, VFT model
Citation Format(s)
Structural dependence of the molecular mobility in acetylated starch. / Nasseri, Rasool; Moresoli, Christine; Yu, Aiping et al.
In: Polymer, Vol. 215, 123371, 12.02.2021.
In: Polymer, Vol. 215, 123371, 12.02.2021.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review