The general solvation equation
has been used to evaluate the effect of molecular weight, hydroxyl end groups and temperature on the solubility characteristics of poly(ethylene oxide), PEO. In this equationL is the gas-liquid partition coefficient of a series of probes on PEO, and the explanatory variables are solute properties describing the excess molar refraction,R 2, the probe dipolarity-polarisability, π 2 H , and the probe hydrogen-bond acidity and basicity, α 2 H and β 2 H .L 16 is the gas-liquid partition coefficient of the probe onn hexadecane at 298 K. Ther·R 2 andl·logL 16 terms increased with increase in molecular weight whereas thes·π 2 H and a α 2 H terms decreased; in all cases theb·α 2 H term was not significant. Since thes-constant is a measure of polymer polarity-polarisability, and thea-constant a measure of polymer basicity, we deduce that these polymer properties decrease with increasing molecular weight. Chains with molecular weight below 3000 showed a more rapid decrease in basicity compared to the higher molecular weight species. Thes·π 2 H ,a·α 2 H andl·logL 16 terms all decreased with increase in temperature. Finally, the contribution of the terminal hydroxyl groups to the total polymer basicity was evaluated and discussed.
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Sakellariou, P., Abraham, M.H. & Whiting, G.S. Solubility characteristics of poly(ethylene oxide): Effect of molecular weight, end groups and temperature. Colloid Polym Sci 272, 872–875 (1994). https://doi.org/10.1007/BF00652428
- Poly(ethylene oxide)
- hydroxyl end groups
- solute interactions