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Findings from University of Paris Update Knowledge of Urea (Concentration Evolution of the Dielectric Response of Hydrogen-Bonded Supramolecular...

August 15, 2014



Findings from University of Paris Update Knowledge of Urea (Concentration Evolution of the Dielectric Response of Hydrogen-Bonded Supramolecular Polymers Formed by Dialkylurea in Non-Polar Medium)

By a News Reporter-Staff News Editor at Science Letter -- A new study on Urea is now available. According to news reporting originating from Paris, France, by NewsRx correspondents, research stated, "Theoretical predictions on the dielectric response of different dynamic models of supramolecular chain polymers [J. Chem. Phys. 2006, 12,5, 184905], have been experimentally verified for the strongly hydrogen-bonded linear polymers formed by N,N'-di(2-ethylhexyl)urea (EHU), RNH center dot CO center dot NH center dot R, R = CH2CH(C4H9)C2H5, dissolved in nonpolar medium. Within evolution of the dielectric response upon the urea concentration, one can recognize the basic theoretical results presented in the cited paper."

Our news editors obtained a quote from the research from the University of Paris, "Namely, in diluted and not too concentrated solutions, where the degree of the urea self-association and the viscosity of solutions are relatively low, the dielectric relaxation spectra have rather a complex form (the Davidson Cole type), as predicted for the frozen Rouse (unbreakable) chains. However, with increasing of the urea concentration, followed by an essential rise of the solutions viscosity, i.e., together with increasing of the complexity of the system, the dielectric spectra become more and more simple."

According to the news editors, the research concluded: "From the EHU mole fraction of about x = 0.5 up to the neat urea, x = 1, one records the simplest possible dielectric relaxation spectra (the Debyetype), as theoretically predicted for the monomer-mediated polymerization and/or scission-recombination reaction kinetics models."

For more information on this research see: Concentration Evolution of the Dielectric Response of Hydrogen-Bonded Supramolecular Polymers Formed by Dialkylurea in Non-Polar Medium. Macromolecules, 2014;47(7):2464-2470. Macromolecules can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Macromolecules - www.pubs.acs.org/journal/mamobx)

The news editors report that additional information may be obtained by contacting J. Swiergiel, University of Paris, F-75005 Paris, France. Additional authors for this research include L. Bouteiller and J. Jadzyn (see also Urea).

Keywords for this news article include: Urea, Paris, Gases, France, Europe, Elements, Hydrogen, Nanotechnology, Supramolecular, Inorganic Chemicals, Emerging Technologies

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Science Letter


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