Contrary hydration behavior of N-isopropylacrylamide to its polymer, P(NIPAm), with a lower critical solution temperature

Article Abstract:

Several high-frequency dielectric relaxation techniques are employed to analyze the contrary hydration behavior of N-isopropylacrylamide (NIAPm) in homogeneous aqueous solution with its polymer poly(NIAPm) at its critical solution temperature. The analysis reveals the temperature dependence of the hydration behavior of the monomer describing and explaining the exchange processes of water molecules hydrated to the solutes and rotational relaxations of the solutes.

All Other Basic Organic Chemical Manufacturing, Industrial Organic Chemicals, Acrylamides, Thermal properties, Relaxation phenomena, Relaxation (Physics), Alkyl groups, Acrylamide, Report

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Dielectric relaxation behavior of aqueous solutions of carbobetaines with varying intercharge distances

Article Abstract:

The dielectric relaxation behavior of aqueous triethylammonioalkanoates (carbobetaines: E[t.sub.3]nCB) with varying number of intercharge methylene groups, n = 1, 3, 4, 5, and 10, was examined in solution as function of frequency from 1 MHz to 20 GHz. The relaxation time of the slow mode increased with increasing n and was attributed to the overall rotational motion of each carbobetaine in aqueous solution.

Analysis, Nuclear magnetic resonance, Dielectric relaxation, Properties, Structure, Betaine, Zwitterions

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Hydration and dynamic behavior of cyclodextrins in aqueous solution

Article Abstract:

Studies about the hydration state and dynamics of plain, partially methylated, permethylated, and partially 2-hydroxypropylated cyclo-dextrins (CDs) in aqueous solution are presented. The hydration numbers of the CDs are observed to strongly depend on the number of hydroxy (OH) groups controlled by chemical modification such as methylation.

Technology application, Nuclear magnetic resonance spectroscopy, Cyclodextrins, Methylation

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