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Comparison of photo- and thermally initiated polymerization-induced self-assembly : a lack of end group fidelity drives the formation of higher order morphologies
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Blackman, Lewis D., Doncom, Kay E. B., Gibson, Matthew I. and O'Reilly, Rachel K. (2017) Comparison of photo- and thermally initiated polymerization-induced self-assembly : a lack of end group fidelity drives the formation of higher order morphologies. Polymer Chemistry, 8 (18). pp. 2860-2871. doi:10.1039/C7PY00407A ISSN 1759-9954.
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Official URL: http://dx.doi.org/10.1039/C7PY00407A
Abstract
Polymerization-induced self-assembly (PISA) is an emerging industrially relevant technology, which allows the preparation of defined and predictable polymer self-assemblies with a wide range of morphologies. In recent years, interest has turned to photoinitiated PISA processes, which show markedly accelerated reaction kinetics and milder conditions, thereby making it an attractive alternative to thermally initiated PISA. Herein, we attempt to elucidate the differences between these two initiation methods using isothermally derived phase diagrams of a well-documented poly(ethylene glycol)-b-(2-hydroxypropyl methacrylate) (PEG-b-HPMA) PISA system. By studying the influence of the intensity of the light source used, as well as an investigation into the thermodynamically favorable morphologies, the factors dictating differences in the obtained morphologies when comparing photo- and thermally initiated PISA were explored. Our findings indicate that differences in a combination of both reaction kinetics and end group fidelity led to the observed discrepencies between the two techniques. We find that the loss of the end group in photoinitiated PISA drives the formation of higher order structures and that a morphological transition from worms to unilamellar vesicles could be induced by extended periods of light and heat irradiation. Our findings demonstrate that PISA of identical block copolymers by the two different initiation methods can lead to structures that are both chemically and morphologically distinct.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QD Chemistry | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School |
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Library of Congress Subject Headings (LCSH): | Self-assembly (Chemistry), Photopolymerization | ||||||
Journal or Publication Title: | Polymer Chemistry | ||||||
Publisher: | Royal Society of Chemistry | ||||||
ISSN: | 1759-9954 | ||||||
Official Date: | 14 May 2017 | ||||||
Dates: |
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Volume: | 8 | ||||||
Number: | 18 | ||||||
Page Range: | pp. 2860-2871 | ||||||
DOI: | 10.1039/C7PY00407A | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Date of first compliant deposit: | 11 May 2017 | ||||||
Date of first compliant Open Access: | 14 May 2018 | ||||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), BP (Firm), European Research Council (ERC) | ||||||
Grant number: | 638661, 615142 (ERC) |
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