RAFT mediated polymerization of methyl methacrylate initiated by bergman cyclization: Access to high molecular weight narrow polydispersity polymers
Gerstel, P. & Barner-Kowollik, C. (2011) RAFT mediated polymerization of methyl methacrylate initiated by bergman cyclization: Access to high molecular weight narrow polydispersity polymers. Macromolecular Rapid Communications, 32(5).
The first RAFT mediated polymerization of methyl methacrylate initiated by diradicals derived from Bergman cyclization was performed employing 3,4-benzocyclodec-3-ene-1,5-diyne (BCDY) as diradical source and cyanoisopropyldithiobenzoate (CPDB) as RAFT agent. The polymerization was conducted in bulk at 80°C for 3h. The concentration of the enediyne was kept constant at 3.0× 10-2 mol ·L-1 and the RAFT agent concentration was varied between 0.0mol ·L-1 and 2.4× 10-1 mol ·L-1. A detailed ESI-MS analysis reveals the absence of intramolecular termination reactions (ring formation) in the RAFT mediated system, which usually makes diradicalic initiation unfavorable. The presence of polymeric chains propagating at both ends could be confirmed. The conversion of the RAFT mediated polymerization was up to more than two times higher than the RAFT free polymerization at identical conditions. Thus, polymers with narrow polydispersities (1.1 ≤ PDI ≤ 1.5) even at very high molecular weights (near 400000Da) were obtained within modest reaction times. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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|Item Type:||Journal Article|
|Additional Information:||Cited By :4
Export Date: 5 September 2016
Correspondence Address: Barner-Kowollik, C.; Preparative Macromolecular Chemistry, Institut für Technische Chemie und Polymerchemie, Karlsruhe Institute of Technology (KIT), Engesserstrasse 18, 76128 Karlsruhe, Germany; email: email@example.com
Chemicals/CAS: methacrylic acid methyl ester, 80-62-6; Methacrylates; Methylmethacrylate; Polymers
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|Keywords:||bergmann cyclization, methyl methacrylate, RAFT, Bergman cyclization, Diradicals, Enediynes, High molecular weight, Identical conditions, Methyl methacrylates, Polymeric chain, RAFT agents, RAFT-mediated polymerization, Reaction time, Ring formation, Termination reactions, Acrylic monomers, Esters, Polydispersity, Polymerization, Polymers, Cyclization, methacrylic acid derivative, methacrylic acid methyl ester, polymer, chemical structure, chemistry, molecular weight, Methacrylates, Methylmethacrylate, Molecular Structure|
|Divisions:||Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Deposited On:||22 Sep 2016 04:50|
|Last Modified:||05 Oct 2016 03:16|
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