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Characterization of diblock copolymer order-order transitions in semidilute aqueous solution using fluorescence correlation spectroscopy

Lookup NU author(s): Professor Mark Geoghegan

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© 2015 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.The temperature and pH-dependent diffusion of poly(glycerol monomethacrylate)-block-poly(2-hydroxypropyl methacrylate) nanoparticles prepared via polymerization-induced self-assembly in water is characterized using fluorescence correlation spectroscopy (FCS). Lowering the solution temperature or raising the solution pH induces a worm-to-sphere transition and hence an increase in diffusion coefficient by a factor of between four and eight. FCS enables morphological transitions to be monitored at relatively high copolymer concentrations (10% w/w) compared to those required for dynamic light scattering (0.1% w/w). This is important because such transitions are reversible at the former concentration, whereas they are irreversible at the latter. Furthermore, the FCS data suggest that the thermal transition takes place over a very narrow temperature range (less than 2 °C). These results demonstrate the application of FCS to characterize order-order transitions, as opposed to order-disorder transitions. The temperature and pH-dependent diffusion of poly(glycerol monomethacrylate)-block-poly(2-hydroxypropylmethacrylate)- nanoparticles in water is characterized using fluorescence correlation spectroscopy. Lowering either the solution temperature or pH induces a worm-to-sphere transition and hence an increase in diffusion coefficient by a factor of between four and eight.


Publication metadata

Author(s): Clarkson CG, Lovett JR, Madsen J, Armes SP, Geoghegan M

Publication type: Article

Publication status: Published

Journal: Macromolecular Rapid Communications

Year: 2015

Volume: 36

Issue: 17

Pages: 1572-1577

Print publication date: 01/09/2015

Online publication date: 22/05/2015

Acceptance date: 15/05/2015

Date deposited: 19/12/2019

ISSN (print): 1022-1336

ISSN (electronic): 1521-3927

Publisher: Wiley-VCH Verlag

URL: https://doi.org/10.1002/marc.201500208

DOI: 10.1002/marc.201500208

PubMed id: 26096738


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