Dielectric relaxation in aqueous solutions of some oxygen-containing linear hydrocarbon polymers

Abstract

Complex dielectric constants of aqueous solutions of nonionic linear polymers have been measured at 10-18 frequencies in the range 0.4-40 GHz at 25 °C by an interferometric transmission method. The solutes were polyethylene oxide) and poly(vinyl alcohol) polymers of different molecular weight ( = 3400-600 000) and one sample of poly (vinyl methyl ether). To the observed data were fitted a sum of Debye relaxation functions to yield the hydration number and reorientation time of the hydration water on one hand and the relaxation strength and relaxation time of the solute on the other hand. The values of the former parameters are compared with those for poly(vinylpyrrolidone) samples and for dioxane and other monomers in order to obtain insight into the effect of macromolecular size, shape, and flexibility upon the dynamics of the surrounding water.

Chemical modification of silica gels

“…degree of hydration has been observed for PEG 400 at 3.1-3.5 H20 molecules per monomer and "--26.4 H20 molecules per PEG molecule [13]. The hydration of the added PEG at the initial stage of the sol-gel process would cause a reduction (i.e., 32% and 66% for PEG200 and PEG400) in the water available for TEOS hydrolysis and (in a system with a limited amount of water present, e.g., H20/SIO2 = 4) this could be important.…”

Dielectric spectroscopy and viscosity studies of aqueous poly(ethylene oxide) and poly(vinyl pyrrolidone) blend

“…The dielectric relaxation spectroscopy is mainly used to explore the complex interactions between polymer and the solvent molecules and their effect on the molecular dynamics. The dielectric properties of PEO [1,2], PVP [3][4][5][6][7][8][9][10][11][12][13] and related materials [14,15] have been studied extensively. Recently, authors studied the dielectric behaviour of these polymers hydrocolloids loaded with montmorillonite (MMT) clay for their coating applications [16][17][18].…”

Catalytic Activity of Hexokinase in Reversed Micelles

“…The C 12 E 8 has eight ethylene oxide (EO) residues and nine oxygen molecules. While polyoxyethylene glycol can get nearly two molecules of water per the EO group, the EO group in organized assembly, such as in reversed micelles, is associated with four molecules of water [37][38][39][40]. Almost all of the water molecules are hydrated with EO chains of C 12 E 8 in the reversed micelles until W 0 = ca.…”