Mixts. contg. water and poly(oxyethylene-b-oxypropylene-b-oxyethylene) were studied and the phase boundaries detd. The phase diagram shows similarities with non-ionic surfactant systems of the n-alkyl-polyoxyethylene glycol family, with occurrence of different lyotropic liq. cryst. phases and of upper consolute boundaries. Added sodium salts have a pronounced effect on the crit. soln. boundaries, which can be shifted upwards (downwards), depending on the counterion. A qual. explanation of the above effects is given in terms of adsorption and/or depletion of the electrolytes at the polar-apolar interface of the aggregates formed by block copolymers.
PHASE EQUILIBRIA IN A WATER-BLOCK COPOLYMER SYSTEM / LA MESA, Camillo. - In: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY. - ISSN 1388-6150. - STAMPA. - 61:(2000), pp. 493-501.
PHASE EQUILIBRIA IN A WATER-BLOCK COPOLYMER SYSTEM
LA MESA, Camillo
2000
Abstract
Mixts. contg. water and poly(oxyethylene-b-oxypropylene-b-oxyethylene) were studied and the phase boundaries detd. The phase diagram shows similarities with non-ionic surfactant systems of the n-alkyl-polyoxyethylene glycol family, with occurrence of different lyotropic liq. cryst. phases and of upper consolute boundaries. Added sodium salts have a pronounced effect on the crit. soln. boundaries, which can be shifted upwards (downwards), depending on the counterion. A qual. explanation of the above effects is given in terms of adsorption and/or depletion of the electrolytes at the polar-apolar interface of the aggregates formed by block copolymers.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
