Article (Scientific journals)
Crystallisation-driven self-assembly of poly(2-isopropyl-2- oxazoline)-block-poly(2-methyl-2-oxazoline) above the LCST
Legros, Camille; De Pauw-Gillet, Marie-Claire; Tam, Kam Chiu et al.
2015In Soft Matter
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Keywords :
polyoxazoline; crystallization
Abstract :
[en] The solution behaviour in water of a polyoxazoline-type block copolymer, namely poly(2- isopropyl-2-oxazoline)-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 self-assembly. Spherical micelles were first obtained and could be disassembled in a reversible manner when kept for a short period of time (i.e. t < 1h30) above the LCST, and cooled down to room temperature. In contrast, annealing the copolymer solution for more than 1h30 at 65 °C induced the crystallisation of the PiPrOx block, as evidenced by wide angle X-ray scattering (WAXS) experiments. This crystallisationdriven self-assembly phenomenon resulted in different morphologies, including spherical and distorted crystallised micelles and micron-size fibers, their relative proportion varying with annealing time. Formation of micron-size range fiber-like structures might be explained by a re-organization of parent crystallised micelles. The crystal structure, as determined by WAXS, appeared to be identical to that of the PiPrOx homopolymer.
Disciplines :
Chemistry
Author, co-author :
Legros, Camille ;  Université de Liège - ULiège > Form. doct. sc. (chimie - Bologne)
De Pauw-Gillet, Marie-Claire ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Histologie - Cytologie
Tam, Kam Chiu;  University of Waterloo > Chemical engineering > professor
Taton, Daniel;  Université Bordeaux 1 - ENSCBP > LCPO
lecommandoux, Sebastien;  Université Bordeaux 1 - ENSCBP IPB > LCPO
Language :
English
Title :
Crystallisation-driven self-assembly of poly(2-isopropyl-2- oxazoline)-block-poly(2-methyl-2-oxazoline) above the LCST
Publication date :
2015
Journal title :
Soft Matter
ISSN :
1744-683X
eISSN :
1744-6848
Publisher :
Royal Society of Chemistry, Cambridge, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 31 March 2015

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