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Control of methyl methacrylate radical polymerization via Enhanced Spin Capturing Polymerization (ESCP) by Lin Zang; Edgar H.H. Wong; Christopher Barner-Kowollik; Thomas Junkers is a Materials Science article available to read on EtoBox.

What is Control of methyl methacrylate radical polymerization via Enhanced Spin Capturing Polymerization (ESCP) about?

## a b s t r a c t 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 À1 (at 60 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 midchain functionality present in the generated polymeric material is evidenced via a subsequent nitroxidemediated polymerization process employing the formed ESCP polymer, indicating a chain extension from 37,700 to 118,000 g mol À1 with a concomitant reduction in polydispersity (from 2.3 to 1.5).

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Author

Lin Zang; Edgar H.H. Wong; Christopher Barner-Kowollik; Thomas Junkers

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0032-3861)

Published

2010

Language

EN

Field

Materials Science (Physical Sciences)