Formation of triblock copolymers via a tandem enhanced spin capturing-nitroxide-mediated polymerization reaction sequence

Junkers, T., Zang, L., Wong, E. H. H., Dingenouts, N., & Barner-Kowollik, C. (2011) Formation of triblock copolymers via a tandem enhanced spin capturing-nitroxide-mediated polymerization reaction sequence. Journal of Polymer Science, Part A: Polymer Chemistry, 49(22).

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The preparation of ABA-type block copolymers via tandem enhanced spin capturing polymerization (ESCP) and nitroxide-mediated polymerization (NMP) processes is explored in-depth. Midchain alkoxyamine functional polystyrenes (Mn = 6200, 12,500 and 19,900 g mol-1) were chain extended with styrene as well as tert-butyl acrylate at elevated temperature NMP conditions (T = 110 °C) generating a tandem ESCP-NMP sequence. Although the chain extensions and thus the block copolymer formation processes function well (yielding in the case of the chain extension with styrene number average molecular weights of up to 20,800 g mol-1 (PDI = 1.22) when the 6200 g mol-1 precursor is used and up to 67,500 g mol-1 (PDI = 1.36) when the 19,900 g mol-1 precursor is used and 21,600 g mol -1 (PDI = 1.17) as well as 37,100 g mol-1 (PDI = 1.21) for the tert-butyl acrylate chain extensions for the 6200 and 12,500 g mol -1 precursors, respectively), it is also evident that the efficiency of the block copolymer formation process decreases with an increasing chain length of the ESCP precursor macromolecules (i.e., for the 19,900 g mol -1 ESCP precursor no efficient chain extension with tert-butyl acrylate can be observed). For the polystyrene-block-tert-butyl acrylate-block-polystyrene polymers, the molecular weights were determined via triple detection SEC using light scattering and small-angle X-ray scattering. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011. A tandem ESCP-NMP reaction sequence is used as a facile avenue for the generation of ABA-type block copolymers. © 2011 Wiley Periodicals, Inc.

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ID Code: 99276
Item Type: Journal Article
Refereed: Yes
Additional Information: Cited By :10
Export Date: 5 September 2016
Correspondence Address: Junkers, T.; Preparative Macromolecular Chemistry, Institut für Technische Chemie und Polymerchemie, Karlsruhe Institute of Technology (KIT), Engesserstrasse 18, Karlsruhe 76128, Germany; email:
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Keywords: block copolymer, living radical polymerization, nitrone, radical polymerization, SAXS, Alkoxyamines, Chain extension, Elevated temperature, Formation process, Nitrones, Nitroxide mediated polymerization, Number average molecular weight, Polymerization reaction, Small angle X-ray scattering, Tert-butyl acrylate, Triple detection SEC, Atom transfer radical polymerization, Block copolymers, Copolymerization, Living polymerization, Molecular weight, Plastic products, Polystyrenes, Scattering, Styrene, X ray scattering, Polymers
DOI: 10.1002/pola.24970
ISSN: 0887624X
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 03:59

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