THERMODYNAMICS OF MICELLE FORMATION BY POLYSTYRENE-BLOCK-POLY(ETHYLENE PROPYLENE) IN NORMAL-OCTANE AND 5-METHYLHEXAN-2-ONE

被引：11

作者：

QUINTANA, JR ^{[1
]}

VILLACAMPA, M ^{[1
]}

SALAZAR, R ^{[1
]}

KATIME, IA ^{[1
]}

机构：

[1] UNIV BASQUE COUNTRY, FAC CIENCIAS,DEPT QUIM FIS,GRP NUEVOS MAT, CAMPOS LEJONA,APARTADO 644, BILBAO, SPAIN

来源：

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1992年 / 88卷 / 18期

关键词：

D O I：

10.1039/ft9928802739

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The influence of the molar mass and chemical composition of copolymers on the thermodynamics of the micellization process has been investigated using two polystyrene-block-poly(ethylene/propylene) copolymers with the same polystyrene (PS) block length but different poly(ethylene/propylene) lengths (PEP). Micelle formation was studied in n-octane and 5-methylhexan-2-one, selective solvents for PEP and PS blocks, respectively. Light-scattering measurements were carried out in order to determine the critical micelle temperature, T(cm), of the different micelle solutions. From T(cm) and concentration data, the standard Gibbs energy, standard enthalpy and standard entropy of micellization were estimated. The characteristics of the copolymer and the block location in the micelle structure were found to influence the thermodynamics of the micellization process. Anomalous behaviour was observed for one copolymer in 5-methylhexan-2-one.

引用

页码：2739 / 2742

页数：4

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