Determination of the Surface Tension Coefficient of Polymer Gel
DOI:
https://doi.org/10.15407/ujpe67.5.365Keywords:
hydroxypropyl cellulose, phase transition, ions, surface tensionAbstract
A method for determining the surface tension coefficient at the sol-gel phase interface in the polymer solution is proposed. The required value is calculated on the basis of the temperature dependence of the gel phase volume fraction formed during the sol-gel transition. The method has been tested using the hydroxypropyl cellulose aqueous solution. In particular, the gel phase volume fraction is determined by measuring the temperature dependence of the solution turbidity. Using the proposed method, it is found that the surface tension coefficient of the examined solution decreases, if ions of group-I alkali metals (Li, Na, and K chlorides) are introduced, which agrees with the classical theory of electrocapillary phenomena in solutions.
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