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Diphenylsilane‐Manganese Acetylacetonate Redox Initiating Systems: Toward Amine‐Free and Peroxide‐Free Systems
Author(s) -
Arar Ahmad,
Mousawi Assi Al,
Boyadjian Cassia,
Garra Patxi,
Fouassier Jean Pierre,
Lalevée Jacques
Publication year - 2020
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.202000058
Subject(s) - oxidizing agent , amine gas treating , manganese , peroxide , chemistry , redox , radical , electron paramagnetic resonance , monomer , photochemistry , polymer chemistry , organic chemistry , polymer , physics , nuclear magnetic resonance
Room temperature redox initiated free radical polymerization (RFRP), without light, brings a significant breakthrough in the field of materials science including energy conservation, high efficiency, robustness in thick materials/composites, and easy operation. Meanwhile, the current redox initiating systems used are based on toxic aromatic amines and hazardous peroxides (e.g., dibenzoylperoxide). In the present paper, for the first time in literature, new amine‐free, peroxide‐free redox two component (2K) initiating systems comprised of diphenylsilane (DPS, a reducing agent) and manganese acetylacetonate (Mn(acac)3, an oxidizing agent) are proposed. The significance of the system is its applicability under mild conditions (RT, under air). Optical pyrometry measurement results showed that the DPS in combination with Mn(acac)3 exhibited an excellent radical initiating property for benchmark (meth)acrylate monomers, competitive with a well‐established amine/dibenzoyl peroxide reference. Based on electron spin resonance experiments, the initiating chemical mechanisms of RFRP are proposed.