DI COLA, Emanuela; LEFEBVRE, Christelle; DEFFIEUX, Alain; NARAYANAN, Theyencheri; BORSALI, Redouane

doi:10.1039/b812025k

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DI COLA, Emanuela
European Synchrotron Radiation Facility [ESRF]

LEFEBVRE, Christelle
Groupe matière condensée et matériaux [GMCM]
Laboratoire de Chimie des Polymères Organiques [LCPO]

DEFFIEUX, Alain
Laboratoire de Chimie des Polymères Organiques [LCPO]
Team 1 LCPO : Polymerization Catalyses & Engineering

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Soft Matter. 2009, vol. 5, n° 5, p. 1081-1090

Royal Society of Chemistry

Résumé en anglais

The morphology of micelles formed from linear and cyclic poly(styrene-b-isoprene) copolymers (PS166-b-PI278) has been studied in solvents with different selectivity for the two block components: heptane and decane, good solvents for the PI block, and DMF, a good solvent for the PS block. Using small and ultra small angle X-ray scattering experiments, SAXS and USAXS, respectively, morphological changes were monitored as a function of the temperature. While micelles formed in DMF were stable and no morphological changes occurred as a function of the temperature, transformations from cylinder-like micelles to vesicles-like objects were observed in both decane and heptane above 60 degrees C for the linear PS-b-PI copolymer. The transition occurred through intermediate steps, where the coexistence between different micellar morphologies was observed. On the contrary, the morphology of the block copolymers with the cyclic architecture was found to be independent of temperature and concentration. For linear blocks, a demicellization was detected at higher temperatures (above 80 degrees C) and the process was fully reversible when the solution was cooled down to ambient temperature. These results are consistent with complementary dynamic light scattering (DLS) observations.< Réduire

Mots clés en anglais

SMALL-ANGLE SCATTERING

SPONTANEOUS VESICLE FORMATION

THREAD-LIKE MICELLES

CRYO-TEM

MICROPHASE SEPARATION

DIBLOCK COPOLYMERS

DYNAMICS

COLLOIDS

SAXS

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Micellar transformations of poly(styrene-b-isoprene) block copolymers in selective solvents

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