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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/4449

Title: Investigation of the degree of homogeneity and hydrogen bonding in PEG/PVP blends prepared in supercritical CO2: comparison with ethanol-cast blends and physical mixtures
Authors: Labuschagne, PW
John, MJ
Sadiku, RE
Keywords: Supercritical fluids
Polymer blends
H-bonding
Diffusion
Supercritical fluids
Issue Date: Jul-2010
Publisher: Elsevier
Citation: Labuschagne, PW, John, MJ and Sadiku, RE. 2010. Investigation of the degree of homogeneity and hydrogen bonding in PEG/PVP blends prepared in supercritical CO2: comparison with ethanol-cast blends and physical mixtures. Journal of Supercritical Fluids, Vol. 54(1), pp 81-88
Series/Report no.: Journal of Supercritical Fluids
Abstract: The degree of homogeneity and H-bond interaction in blends of low-molecular-mass poly(ethylene glycols) (PEG, Mw = 400, 600, 1000) and poly(vinylpyrrolidone) (PVP, Mw =9×103) prepared in supercritical CO2, ethanol and as physical mixtures were studied by differential scanning calorimetry (DSC), Fourier-transform infrared (FTIR) spectroscopy and dynamic mechanical analysis (DMA) techniques. Homogeneity of samples prepared in supercritical CO2 were greater than physically mixed samples, but slightly less than ethanol-cast samples. PEG–PVP H-bond interaction was higher for ethanol-cast blends when compared to blends prepared in supercritical CO2. This reduced interaction was attributed to a combination of: (1) shielding of PEG–PVP H-bond interactions when CO2 is dissolved in the blend; (2) rapidly reduced PEG and PVP chain mobility upon CO2 venting, delaying rearrangement for optimum PEG–PVP H-bond interaction.
Description: Copyright: 2010 Elsevier. This is the author's pre print version of the work. The definitive version is published in the Journal of Supercritical Fluids, Vol. 54(1), pp 81-88
URI: http://www.citeulike.org/user/Zuzina/article/6961087
http://hdl.handle.net/10204/4449
ISSN: 0896-8446
Appears in Collections:Polymers and composites
Fibres and textiles
General science, engineering & technology

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