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New copper(I) complex based initiating systems in redox polymerization and comparison with the amine/benzoyl peroxide reference

Abstract : Novel copper complex based initiating systems for redox free radical polymerization (FRP) of methacrylate resins under mild conditions are proposed. Remarkably, the FRP performance of the Cu(I)/ascorbic acid (Vitamin C - VitC)/benzoyl peroxide (BPO) redox system is noticeably more significant than that of the amine/BPO reference especially at the top surface where the oxygen inhibition is particularly deleterious. The Cu(I)/BPO interaction leads to a decomposition of the peroxide and generates a benzoyl radical and Cu(II) as a byproduct. The ascorbic acid acts as a reducing agent and allows the regeneration of Cu(I) from Cu(II). Hydroperoxides formed at the surface through the radical/O-2 interaction are also decomposed by the new proposed Cu complex leading to additional polymerization initiating species. The structure/ reactivity relationship of the new proposed Cu(I) complexes in the Cu(I)/VitC/BPO systems is studied. The use of Cu(I)/VitC/BPO/iodonium salt systems in redox photoactivated FRP is also explored.
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https://hal-amu.archives-ouvertes.fr/hal-01774197
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Submitted on : Monday, April 23, 2018 - 2:42:12 PM
Last modification on : Friday, January 7, 2022 - 3:53:28 AM

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P. Garra, A. Kermagoret, A. Al Mousawi, F. Dumur, D. Gigmes, et al.. New copper(I) complex based initiating systems in redox polymerization and comparison with the amine/benzoyl peroxide reference. Polymer Chemistry, Royal Society of Chemistry - RSC, 2017, 8 (28), pp.4088--4097. ⟨10.1039/c7py00726d⟩. ⟨hal-01774197⟩

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