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Citation: Zhou Wei-Ping, He Zhi-Duan, Zhang Hao. THE THERMODYNAMICS OF MICELLIZATION BY BLOCK COPOLYMER SEP IN ORGANIC SOLVENTS[J]. Acta Physico-Chimica Sinica, ;1990, 6(06): 693-698. doi: 10.3866/PKU.WHXB19900611 shu

THE THERMODYNAMICS OF MICELLIZATION BY BLOCK COPOLYMER SEP IN ORGANIC SOLVENTS

1.
Laboratory of Polymer Physics; Changchun Institute of Applied Chemistry; Academia Sinica; PRC.

Received Date: 26 September 1989
Available Online: 15 December 1990

The thermodynamics of micellization for polystyrene-b-poly(ethylene/propylene) two-block copolymer(SEP) in the mixtures of n-octane and benzene with different proportions have been studied in this paper. The critical micelle concentrations(CMC) of micelle solutions at various temperatures were measured by low angle laser light scattering photometer(LALLS). The results show that the micellization process of nonpolar copolymer SEP in hydrocarbon solvents are exothermal, and the entropy change is negative. In contrast, for ordinary surfactants in water, it is the enthalpy contribution to the energy change which is responsible for micellization.
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