Dual-Gated Chain Shattering Based on Light Responsive Benzophenones and Thermally Responsive Diels–Alder Linkages
作者： Jan Steinkoenig , Markus M. Zieger , Hatice Mutlu , Christopher Barner-Kowollik
DOI: 10.1021/ACS.MACROMOL.7B01115
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摘要: We exploit the light-adaptive characteristics of benzophenone (BP) to introduce a chain-shattering degradation mechanism triggered by light (λmax = 365 nm, 36 W). Incorporated in every repeat unit via step-growth polymerization AA- and BB-type difunctional monomers entailing thermally reversible hetero-Diels–Alder (HDA) linkages, functional group enables disassembly on-demand degradable polymers within few hours small molecules. Specifically, is photoactivated reversibly generate biradicaloid triplet state on each monomer moiety, which radicals can recombine an interchain cross-linking reaction or undergo reduction process, latter one being key for disassembly. The newly formed hydroxyl functionality ortho-position ester bond induces process subsequent lactonization reaction. light-triggered were assessed detail size-exclusion chromatogr...
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