Chain-Length-Dependent Photolysis of ortho-Nitrobenzyl-Centered Polymers

Bachmann J, Petit C, Michalek L, Catel Y, Blasco E, Blinco JP, Unterreiner AN, Barner-Kowollik C (2021)

Publication Type: Journal article

Publication year: 2021

Journal

ACS Macro Letters

Book Volume: 10

Pages Range: 447-452

Journal Issue: 4

DOI: 10.1021/acsmacrolett.1c00057

Abstract

Herein, we demonstrate that the photochemical cleavage of linear polymers containing a midchain photocleavable moiety strongly depends on the chain length. Based on an ortho-nitrobenzyl (oNB) difunctional reversible addition-fragmentation chain-transfer agent, well-defined poly(methyl acrylate)s (Mn = 1.59-67.6 kg mol-1, D = 1.3-1.4) were synthesized following a core-first approach. Photolysis at λmax = 350 nm of the ortho-nitrobenzyl moiety led to the generation of equally sized polymer segments. The rate of oNB-driven polymer fragmentation, which can be well described by first-order kinetics, strongly increases with increasing molecular weight in a nonlinear fashion, potentially caused by entropic considerations and is compared to the ideal chain model. The current study thus demonstrates that polymer photolysis is dependent on the polymer chain length, with critical implications for photocleavable network design.

Involved external institutions

Queensland University of Technology (QUT) AU Australia (AU) Ivoclar Vivadent AG LI Liechtenstein (LI) Karlsruhe Institute of Technology (KIT) DE Germany (DE)

How to cite

APA:

Bachmann, J., Petit, C., Michalek, L., Catel, Y., Blasco, E., Blinco, J.P.,... Barner-Kowollik, C. (2021). Chain-Length-Dependent Photolysis of ortho-Nitrobenzyl-Centered Polymers. ACS Macro Letters, 10(4), 447-452. https://dx.doi.org/10.1021/acsmacrolett.1c00057

MLA:

Bachmann, Julian, et al. "Chain-Length-Dependent Photolysis of ortho-Nitrobenzyl-Centered Polymers." ACS Macro Letters 10.4 (2021): 447-452.

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