LEGROS, Camille; DE PAUW-GILLET, Marie-Claire; TAM, Kam Chiu; TATON, Daniel; LECOMMANDOUX, Sebastien

doi:10.1039/c5sm00313j

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LEGROS, Camille
Laboratoire de Chimie des Polymères Organiques [LCPO]
University of Waterloo [Waterloo]
Laboratory of Mammalian Cell Culture [GIGA-R]

DE PAUW-GILLET, Marie-Claire
Laboratory of Mammalian Cell Culture [GIGA-R]

TAM, Kam Chiu
University of Waterloo [Waterloo]

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Soft Matter. 2015, vol. 11, n° 17, p. 3354-3359

Royal Society of Chemistry

Résumé en anglais

The solution behaviour in water of a polyoxazoline-type block copolymer, namely poly(2-isopropyl-2oxazoline)-block-poly(2-methyl-2-oxazoline), denoted as P(iPrOx-b-MeOx), above the lower critical solution temperature (LCST) of the PiPrOx block was exploited to induce a temporary or permanent selfassembly. Spherical micelles were first obtained and could be disassembled in a reversible manner when kept for a short period of time (i.e. t < 90 min) above the LCST, and cooled down to room temperature. In contrast, annealing the copolymer solution for more than 90 min at 65 degrees C induced the crystallisation of the PiPrOx block, as evidenced by wide angle X-ray scattering (WAXS) experiments. This crystallisation-driven self-assembly phenomenon resulted in different morphologies, including spherical and distorted crystallised micelles and micron-size fibers, their relative proportion varies with the annealing time. Formation of micron-size range fiber-like structures might be explained by the reorganization of parent crystallised micelles. The crystal structure, as determined by WAXS, appeared to be identical to that of the PiPrOx homopolymer.< Réduire

Mots clés en anglais

POLY(2-ETHYL-2-OXAZOLINE)

POLYMERS

WATER

BLOCK-COPOLYMERS

DIBLOCK COPOLYMERS

POLY(ETHYLENE GLYCOL)

AQUEOUS-SOLUTIONS

CORE MICELLES

POLYMERIZATION

MORPHOLOGY

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Crystallisation-driven self-assembly of poly(2-isopropyl-2-oxazoline)-block-poly(2-methyl-2-oxazoline) above the LCST

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