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

Bachmann Julian; Petit Charlotte; Michalek Lukas; Catel Yohann; Blasco Eva; Blinco James P.; Unterreiner Andreas-Neil; Barner-Kowollik Christopher

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

机译：邻硝基苄基居中聚合物的链长依赖性光解

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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 (M-n = 1.5967.6 kg mol(-1), D = 1.3-1.4) were synthesized following a core-first approach. Photolysis at lambda(max) = 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.

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《ACS Macro Letters》 |2021年第4期|共6页
作者
Bachmann Julian; Petit Charlotte; Michalek Lukas; Catel Yohann; Blasco Eva; Blinco James P.; Unterreiner Andreas-Neil; Barner-Kowollik Christopher;
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Queensland Univ Technol QUT Ctr Mat Sci Sch Chem &

Phys Brisbane Qld 4000 Australia;

Queensland Univ Technol QUT Ctr Mat Sci Sch Chem &

Phys Brisbane Qld 4000 Australia;

Queensland Univ Technol QUT Ctr Mat Sci Sch Chem &

Phys Brisbane Qld 4000 Australia;

Ivoclar Vivadent AG FL-9494 Schaan Liechtenstein;

Karlsruhe Inst Technol KIT Inst Nanotechnol D-76344 Eggenstein Leopoldshafen Germany;

Queensland Univ Technol QUT Ctr Mat Sci Sch Chem &

Phys Brisbane Qld 4000 Australia;

Karlsruhe Inst Technol KIT Inst Phys Chem D-76131 Karlsruhe Germany;

Queensland Univ Technol QUT Ctr Mat Sci Sch Chem &

Phys Brisbane Qld 4000 Australia;

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正文语种 eng
中图分类有机化学;
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Chain-Length-Dependent Photolysis of ortho-Nitrobenzyl-Centered Polymers

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