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Wavelength-Gated Photoreversible Polymerization and Topology Control

preprint
submitted on 29.01.2020 and posted on 30.01.2020 by Hendrik Frisch, Kai Mundsinger, Berwyck Poad, Stephen Blanksby, Christopher Barner-Kowollik
We exploit the wavelength dependence of [2+2] photocycloadditions and -reversions of styrylpyrene to exert unprecedented control over the photoreversible polymerization and topology of telechelic building blocks. Blue light affords high molar mass polymers that are stable at wavelengths exceeding 430 nm yet highly responsive to shorter wavelengths. UVB irradiation induces a rapid depolymerization yielding linear oligomers, whereas violet light generates cyclic entities. Different colors of light thus allow switching between a depolymerization that either proceeds through cyclic or linear topologies. The light-controlled topology formation was evidenced by correlation of mass spectrometry (MS) with size exclusion chromatography (SEC) and ion mobility data.

Funding

Light-Induced chemical modularity: a new frontier in macromolecular design

Australian Research Council

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Queensland University of Technology

History

Email Address of Submitting Author

christopher.barnerkowollik@qut.edu.au

Institution

Queensland University of Technology

Country

Australia

ORCID For Submitting Author

0000-0002-6745-0570

Declaration of Conflict of Interest

There are no conflicts to declare.

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