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Formation of block copolymer micelles in solutions of a linear homopolymer in a good solvent
Author(s) -
Quintana José R.,
Jáñez María D.,
Katime Issa
Publication year - 1995
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.1995.030160810
Subject(s) - micelle , copolymer , polystyrene , solvent , toluene , polymer chemistry , materials science , critical micelle concentration , propene , polymer , enthalpy , thermodynamics of micellization , chemical engineering , thermodynamics , chemistry , organic chemistry , aqueous solution , catalysis , physics , composite material , engineering
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.