Study on the phase separation of plasticised starch/poly(vinyl alcohol) blends

Chaleat, C. M., Halley, P. J. and Truss, R. W. (2012) Study on the phase separation of plasticised starch/poly(vinyl alcohol) blends. Polymer Degradation and Stability, 97 10: 1930-1939. doi:10.1016/j.polymdegradstab.2012.03.001

Author Chaleat, C. M.
Halley, P. J.
Truss, R. W.
Title Study on the phase separation of plasticised starch/poly(vinyl alcohol) blends
Journal name Polymer Degradation and Stability   Check publisher's open access policy
ISSN 0141-3910
Publication date 2012-10-01
Year available 2012
Sub-type Article (original research)
DOI 10.1016/j.polymdegradstab.2012.03.001
Open Access Status Not yet assessed
Volume 97
Issue 10
Start page 1930
End page 1939
Total pages 10
Place of publication Camden, United Kingdom
Publisher Elsevier
Language eng
Abstract The phase separation and the intermolecular interactions of a series of extruded plasticised starch (PlS)/poly(vinyl alcohol) (PVOH) blends with various starch to PVOH ratios has been studied. Investigation on their thermo-mechanical behaviour indicated the existence of two phases: the low temperature transition was attributed to the PVOH-rich phase and the high temperature transition was assigned to the PlS-rich phase. An increase in the α -relaxation temperature of the PVOH-rich phase with the introduction of starch in the system suggested a small degree of miscibility. The water was also shown to partition unequally between both phases. High resolution solid-state NMR revealed slight variations between the different PlS/PVOH compositions, which could be related to either interactions between PVOH and starch chains or difference in short-range ordering (e.g. single helices). Proton spin-lattice relaxation time measurements confirmed the phase separation within the blend occurring, however, with a small degree of inter-mixing.
Keyword Starch
Starch blend
Poly(vinyl alcohol)
Glass transition temperature
Solid-state NMR
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online: 13 March 2012.

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