RAFT-mediated ab initio emulsion copolymerization of 1,3-butadiene with acrylonitrile

Hlalele, L., D'Hooge, D. R., Dürr, C. J., Kaiser, A., Brandau, S., & Barner-Kowollik, C. (2014) RAFT-mediated ab initio emulsion copolymerization of 1,3-butadiene with acrylonitrile. Macromolecules, 47(9).

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Abstract

The successful RAFT-mediated ab initio emulsion copolymerization of acrylonitrile and 1,3-butadiene using 2-(((dodecylsulfanyl)carbonothioyl) sulfanyl)propanoic acid (DoPAT) is reported at 45-55 °C. The number-average molecular weight exhibits a linear evolution as a function of monomer conversion (5000 ≤ Mn (g mol-1) ≤ 41 000, 1.3 ≤ D (-) ≤ 3.3). Relatively good control (e.g., D ≈ 1.2 for selected conditions) over the polymerization up to moderate monomer conversion (50-60%) was attained when the employed initial molar ratio of RAFT agent to initiator was 2.5 or higher. Good ω-end-group functionality is evidenced by chain extension of NBR with a polystyrene block, with both 1H NMR and SEC showing the average fraction of the NBR block as ca. 75 mol%. A kinetic model implemented via the PREDICI software package confirms the experimental findings, including a semiempirical approach to account for branch formation. The onset of the loss in control over the copolymerization at conversions >40% was tentatively attributed to branch formation. The current study evidences that RAFT mediated ab initio emulsion polymerization of 1,3-butadiene and acrylonitrile is a viable polymerization protocol for the synthesis of well-defined next generation nitrile-butadiene rubbers including in industrial context. © 2014 American Chemical Society.

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ID Code: 99388
Item Type: Journal Article
Refereed: Yes
Additional Information: Cited By :6
Export Date: 5 September 2016
CODEN: MAMOB
Correspondence Address: Barner-Kowollik, C.; Preparative Macromolecular Chemistry, Institut für Technische Chemie und Polymerchemie, Karlsruhe Institute of Technology (KIT), Engesserstr. 18, 76128 Karlsruhe, Germany; email: christopher.barner-kowollik@kit.edu
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DOI: 10.1021/ma500055q
ISSN: 00249297
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: 27 Sep 2016 03:06

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