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Formation of block copolymer micelles in solutions of a linear homopolymer in a good solvent

✍ Scribed by José R. Quintana; María D. Jáñez; Issa Katime

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
310 KB
Volume
16
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

The existence of micelles of polystyrene‐block‐poly(ethylene/propene) in solutions of polystyrene in toluene was investigated. Toluene is a good solvent of both copolymer blocks whereas polystyrene and poly(ethylene/propene) are immiscible polymers. The presence of homopolystyrene at high enough concentration can induce the micellization of polystyrene‐block‐poly(ethylene/propene) in solution of a good solvent such as toluene. The thermodynamics of this new micelle system at a given polystyrene concentration was studied. Light scattering measurements were carried out in order to determine the critical micelle temperature (CMT) of different micellar solutions. Standard Gibbs energy, enthalpy and entropy of micellization were estimated from CMT and concentration data. The numerical values found were less negative than those found for micelle systems consisting in a block copolymer dissolved in a single selective solvent.

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