Journal Article10.1021/MA049623D
Insight into Clustering in Poly(ethylene oxide) Solutions
TL;DR: In this paper, the authors used small-angle neutron scattering from polyethylene oxide (PEO) solutions in various deuterated solvents, and analyzed the possible causes of clustering.
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Abstract: The clustering phenomenon has been observed in many macromolecular systems. Poly(ethylene oxide) solutions are characterized by a clustering effect that has been extensively discussed in the literature. Its origin has remained elusive. Using small-angle neutron scattering from PEO solutions in various deuterated solvents, the possible causes of clustering that have been given in the literature are analyzed here. These include impurities in water, possible PEO crystallization, a subtle phase transition whereby a concentrated phase coexists with free polymer coils, hydrogen-bond physical cross-linking, and finally chain ends effect. We have shown that under the experimental conditions considered here (4% PEO weight fraction) the mostly forgotten chain ends effect is at the origin of clustering in poly(ethylene oxide) solutions.
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Citations
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References
Water structure and changes in thermal stability of the system poly(ethylene oxide)–water
Roland Kjellander,Ebba Florin +1 more
TL;DR: In this paper, the phase behavior of aqueous solutions of poly(ethylene oxide), PEO, is analyzed by means of a structural model of the system and a simple statistical-mechanical model based thereupon.
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A new model for upper and lower critical solution temperatures in poly(ethylene oxide) solutions
TL;DR: Diagramme de phases du systeme PEO-eau calcule en utilisant la theorie de Flory; accord semi-quantitatif avec l'experience as discussed by the authors.
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Role of Competitive PEO−Water and Water−Water Hydrogen Bonding in Aqueous Solution PEO Behavior
TL;DR: In this paper, the authors calculate the temperature and concentration dependence of the average fraction of hydrogen bonds between poly(ethylene oxide) and water and find very good agreement between their predictions and experimental or MD simulation data.
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