Ultra-High-Molecular-Weight Polymers Produced by the Immortal Phosphine-Based Catalyst System
Yun Bai
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin, 130012 China
Search for more papers by this authorDr. Jianghua He
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin, 130012 China
Search for more papers by this authorCorresponding Author
Prof. Dr. Yuetao Zhang
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin, 130012 China
Search for more papers by this authorYun Bai
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin, 130012 China
Search for more papers by this authorDr. Jianghua He
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin, 130012 China
Search for more papers by this authorCorresponding Author
Prof. Dr. Yuetao Zhang
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin, 130012 China
Search for more papers by this authorGraphical Abstract
An immortal FLP system composed of organophosporus superbase and organoaluminum promoted the living polymerization of methyl methacrylate, achieving polymers with medium to ultrahigh molecular weight (Mn up to 1927 kg mol−1) and narrow molecular weight distribution.
Abstract
A strong organophosphorus superbase, N-(diphenylphosphanyl)-1,3-diisopropyl-4,5-dimethyl-1,3-dihydro-2H-imidazol-2-imine (IAP3) was combined with a sterically encumbered but modestly acidic Lewis acid (LA), (4-Me-2,6-tBu2-C6H2O)AliBu2 ((BHT)AliBu2), to synergistically promote the frustrated Lewis pair (FLP)-catalyzed living polymerization of methyl methacrylate (MMA), achieving ultrahigh molecular weight (UHMW) poly(methyl methacrylate) (PMMA) with Mn up to 1927 kg mol−1 and narrow molecular weight distribution (MWD) at room temperature (RT). This FLP catalyst system exhibits exceptionally long lifetime polymerization performance even in the absence of free MMA, which could reinitiate the desired living polymerization after the resulting system was held at RT for 24 h.
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