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- W1998802479 abstract "A study was made of the temperature dependence of viscosity and the glass transition points were measured of narrow polyoxyethylene (POE) fractions and low molecular weight homologues with terminal hydroxyl groups or chlorine atoms. From thermodynamic considerations it was shown that the “actual” glass transition point of high molecular weight POE is ∼ 216°K. Parameters of the Vogel and Adam-Gibbs equations were determined. It was found that the characteristic temperature T 0 , which corresponds to the disappearance of free volume of the system and T 2 at which the conformation and excess entropy of POE becomes zero ( T 0 = T 2 = 180°K) are identical. The “critical” molecular weight corresponding to the formation of a “structural network of contacts” in a POE melt ( M cr = 3500), was determined. It was shown that the abnormal dependence of the viscosity of POE oligomers on molecular weight in the range of M < M cr is due to the existence of associates, in which macromolecules are linked with intermolecular hydrogen bonds." @default.
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- W1998802479 date "1974-01-01" @default.
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- W1998802479 title "Viscosity and molecular behaviour of narrow polyoxyethylene fractions in melt" @default.
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- W1998802479 doi "https://doi.org/10.1016/0032-3950(74)90320-7" @default.
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