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

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 temperatu...

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Bibliographic Details
Published in:Polymer degradation and stability 2012-10, Vol.97 (10), p.1930-1939
Main Authors: Chaléat, C.M., Halley, P.J., Truss, R.W.
Format: Article
Language:English
Subjects:
Alcohols
Applied sciences
Blends
Degradation
Exact sciences and technology
Glass transition temperature
Miscibility
Order disorder
Phase separation
Phase transformations
Physicochemistry of polymers
Poly(vinyl alcohol)
Polymer blends
Polymer industry, paints, wood
Solid-state NMR
Starch
Starch blend
Starches
Technology of polymers
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Summary: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.
ISSN:0141-3910
1873-2321
DOI:10.1016/j.polymdegradstab.2012.03.001