PUTAUX, Jean-Luc; MINATTI, Edson; LEFEBVRE, Christelle; BORSALI, Redouane; SCHAPPACHER, Michel; DEFFIEUX, Alain

doi:10.1039/b403157a

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PUTAUX, Jean-Luc
Centre de Recherches sur les Macromolécules Végétales [CERMAV]

MINATTI, Edson
Univ Fed Santa Catarina, Dept Quim

LEFEBVRE, Christelle
Laboratoire de Chimie des polymères organiques [LCPO]

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Faraday Discussions. 2005, vol. 128, p. 163-178

Royal Society of Chemistry

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We have studied the morphology of self-assembled micelles made of linear and cyclic poly(styrene-b-isoprene) PS-b-PI block copolymers dispersed in selective solvents of the PI block (n-heptane, n-decane). Up to a copolymer concentration of 5 mg mL(-1), the micelles made from linear block copolymer chains adopt a spherical shape. Those arising from cyclic copolymer chains having exactly the same molar mass and volume fraction self-assemble into (i) planar sun. ower-shaped particles at low concentration (c < 0.1 mg mL(-1)), (ii) giant wormlike micelles at intermediate concentration (0.1 mg mL(-1) < c < 2 mg mL(-1)) and (iii) vesicles at higher concentration (2 mg mL(-1) < c < 5 mg mL(-1)). Those results were obtained using dynamic light scattering and in situ freeze-drying cryo-transmission electron microscopy. In this contribution, we discuss the effects of concentration and temperature on the morphology of the self-assembled particles made from both linear and cyclic PS-PI copolymers, and highlight the surprising vesicle formation in cyclic block copolymer solutions.< Leer menos

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DILUTE-SOLUTION

AQUEOUS-SOLUTION

MULTIPLE MORPHOLOGIES

CONCENTRATED-SOLUTIONS

TRANSMISSION ELECTRON-MICROSCOPY

POLYSTYRENE-BLOCK-POLY(ETHYLENE PROPYLENE) COPOLYMER

ANGLE NEUTRON-SCATTERING

ACID) BLOCK-COPOLYMERS

SELECTIVE SOLVENTS

DRUG-DELIVERY

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Vesicles made of PS-PI cyclic diblock copolymers: In situ freeze-drying cryo-TEM and dynamic light scattering experiments

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