Adsorption characteristics of water-soluble polymers. II. Poly(ethylene oxide) at the aqueous-air interface

  • Glass J
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Abstract

The surface tension characteristics of poly(ethylene oxide) derivs. were examd. as a function of concn., time, temp., and mol. wt. The effects of the polymer's adsorption rheology and the degree of alkyl substitution upon the surface tension of ethylene oxide (I) derivs. were also examd. A high (106) mol. wt. material exhibits a slightly pos. surface activity-temp. coeff. The adsorption characteristics, as a function of concn. and time, remain approx. const. in the 104-106 mol. wt. range. Below mol. wt. 104 the surface activities of the aq. solns. exhibit a marked dependence upon polymer mol. wt.;i.e., the surface tension values decrease with decreasing d.p. In contrast to the high mol. wt. material, I polymer of 400 mol. wt. exhibits exothermic adsorption characteristics. The marked surface activity dependence is characterized by a decreasing entropy factor and by an increasingly compact rheological structure. Both factors are independently assocd. with the polymer's decreasing mol. wt. An examn. of alkyl-substituted triethylene glycol derivs. supports the above conclusions and provides insight into the adsorption rheology of poly(ethylene oxides). Contrary to previous investigations, this study indicates that all I adducts from the trimeric to the 2.4 * 106 mol. wt. polymer have portions of their structures oriented out of the interfacial region. The surface activity of I copolymers, as a function of concn., reveals unique polynomial behavior. These adsorption characteristics are interpreted as the first observed reorientations, by surface tension measurements, of interfacially adsorbed macromols. [on SciFinder (R)]

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Authors

  • J. E. Glass

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