1. Nitroxide-Mediated Controlled Free Radical Polymerization of the Chelate Monomer 4-Styryl-tris(2-pyridyl)borate (StTpyb) and Supramolecular Assembly via Metal Complexation
- Author
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Chengzhong Cui, Patrick O. Shipman, Roger A. Lalancette, Frieder Jäkle, Patrycja Lupinska, and John B. Sheridan
- Subjects
Materials science ,Polymers and Plastics ,Organic Chemistry ,Radical polymerization ,Chain transfer ,Inorganic Chemistry ,Living free-radical polymerization ,Chain-growth polymerization ,Polymerization ,Polymer chemistry ,Materials Chemistry ,Living polymerization ,Reversible addition−fragmentation chain-transfer polymerization ,Ionic polymerization - Abstract
The reaction of 4-(dibromoboryl)styrene with 2-pyridylmagnesium chloride resulted in the formation of 4-styryl-tris(2-pyridyl)borate free acid (StTypb), a new polymerizable nonpyrazolyl “scorpionate” ligand. StTypb did not undergo self-initiated polymerization under ambient conditions and proved to slowly polymerize through standard radical polymerization at 90 °C. Nitroxide-mediated polymerization (NMP) of StTypb at 135 °C proceeded with good control, resulting in a polymer of Mn = 27400 and PDI = 1.21. The TEMPO-terminated homopolymer successfully initiated the polymerization of styrene, generating an amphiphilic block copolymer with DPn of 1200 and 78 for the PS and the StTypb block, respectively. A similar block copolymer with DPn of 29 and 20 for the PS and the StTypb block respectively was obtained in a reverse polymerization procedure from a PS macroinitiator. The self-assembly of these block copolymers was examined in selective solvents and preliminary metal complexation studies were performed.
- Published
- 2022