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

Soft Matter
Camille LegrosSébastien Lecommandoux

Abstract

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 < 90 min) above the LCST, and cooled down to room temperature. In contrast, annealing the copolymer solution for more than 90 min at 65 °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 re-organization of parent crystallised micelles. The crystal structure, as determined by WAXS, appeared to be identical to that of the PiPrOx homopolymer.

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Citations

Nov 19, 2015·Physical Chemistry Chemical Physics : PCCP·Shengtong Sun, Peiyi Wu
Nov 5, 2015·Physical Chemistry Chemical Physics : PCCP·Shengtong Sun, Peiyi Wu
Dec 12, 2017·Chemistry, an Asian Journal·Johannes C Brendel, Felix H Schacher
Oct 24, 2019·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Tomoki NishimuraKazunari Akiyoshi
Jan 16, 2021·Advanced Healthcare Materials·Anna Zahoranová, Robert Luxenhofer
Mar 7, 2021·International Journal of Molecular Sciences·Wojciech WałachNatalia Oleszko-Torbus
Jun 25, 2021·Chemical Science·Liam MacFarlaneIan Manners
Nov 21, 2018·Biomacromolecules·Gaëlle Le FerSébastien Lecommandoux
Oct 29, 2017·Journal of the American Chemical Society·Maria C ArnoRachel K O'Reilly
Nov 20, 2018·Journal of the American Chemical Society·Alex M OliverIan Manners

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