ISSN:
1435-1536
Keywords:
Hydroxyethyl cellulose
;
phase behavior
;
phase separation
;
polymer-surfactant-interaction
;
aqueous solution
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The phase behavior of ternary aqueous solutions of two samples of hydroxyethyl cellulose (HEC) and oligoethylene glycol mono(n-alkyl) ethers CxEy (x: 11;y: 28, 40) at 25°C has been studied above the CMC of CxEy. The influence of molar mass of HEC and the number of ethylene glycol units on the phase diagram has been investigated. Both binary systems water/HEC and water/CxEy are completely miscible. The ternary mixture of water/polymer/nonionic surfactant is homogeneous if the weight fraction of water is larger than 0.93, or else it can separate segregatively, i.e., HEC is enriched in one phase, the surfactant in the other. The theoretical description is based on an equation for the Gibbs energy of mixing which takes polar conformations into account. The phase diagrams are calculated by means of a new method which does not require the derivatives of the Gibbs energy of mixing.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00652466
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