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Title: Control of methyl methacrylate radical polymerization via Enhanced Spin Capturing Polymerization (ESCP)
Authors: Zang, Lin
Wong, Edgar H. H.
Barner-Kowollik, Christopher
Issue Date: 2010
Source: POLYMER, 51 (17). p. 3821-3825
Abstract: The nitrone mediated polymerization of methyl methacrylate (MMA) via the enhanced (termination) spin capturing polymerization (ESCP) process is made possible via the addition of small amounts of styrene (between 5 and 10 vol.%) to the reaction mixture. Efficient control over the molecular weight between 7000 and 57,000 g mol(-1) (at 60 degrees C) yields macromolecules that feature a mid-chain alkoxyamine functionality and are rich in methyl methacrylate. The collated kinetic and molecular weight data allow for a deduction of the spin capturing constant, C-SC, in the range between 0.15 and 0.30. During the ESCP process, the number average molecular weight, M-n of the formed mid-chain functional polymer is constant up to high monomer to polymer conversions (i.e. 80%). The high degree of alkoxyamine mid-chain functionality present in the generated polymeric material is evidenced via a subsequent nitroxide-mediated polymerization process employing the formed ESCP polymer, indicating a chain extension from 37,700 to 118,000 g mol(-1) with a concomitant reduction in polydispersity (from 2.3 to 1.5). (C) 2010 Elsevier Ltd. All rights reserved.
Notes: [Zang, Lin; Wong, Edgar H. H.; Barner-Kowollik, Christopher; Junkers, Thomas] Karlsruhe Inst Technol, Inst Tech Chem & Polymerchem, D-76128 Karlsruhe, Germany. [Junkers, Thomas] Univ Hasselt, Inst Mat Res IMO, B-3590 Diepenbeek, Belgium. [Wong, Edgar H. H.] Univ New S Wales, Ctr Adv Macromol Design, Sydney, NSW 2052, Australia.;
Keywords: Methyl methacrylate (MMA); Nitrone/nitroxide; Enhanced (termination) spin capturing polymerization (ESCP);Methyl methacrylate (MMA); Nitrone/nitroxide; Enhanced (termination) spin capturing polymerization (ESCP)
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ISSN: 0032-3861
e-ISSN: 1873-2291
DOI: 10.1016/j.polymer.2010.06.040
ISI #: 000280898300001
Category: A1
Type: Journal Contribution
Validations: ecoom 2011
Appears in Collections:Research publications

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