Mechanistic insights into the UV-induced radical copolymerization of 1,3-butadiene with acrylonitrile

Hlalele, L., Dürr, C. J., Lederhose, P., Kaiser, A., Hüsgen, S., Brandau, S., & Barner-Kowollik, C. (2013) Mechanistic insights into the UV-induced radical copolymerization of 1,3-butadiene with acrylonitrile. Macromolecules, 46(6).

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Abstract

An in-depth mechanistic study into the solution based initiator-free UV-induced radical copolymerization of 1,3-butadiene with acrylonitrile is reported. The light induced constant radical flux leads to moderate monomer conversions within 4 to 24 h. The number-average molecular weights of the prepared nitrile butadiene rubber (NBR) range from 2500 to 50 000 g mol -1 (1.7 ≤ PDI ≤ 2.4), while the achievable monomer conversion ranged from close to 7 up to 31% depending on the polymerization temperature, reaction time and UV light intensity. The rate coefficient for the generation of primary radicals, determined as the coupled parameter k1 *k3, showed a dependence on the UV light intensity with values between 6.0 s-2 and 34.6 s-2 deduced for the UV light intensity range of 280 to 700 W. The estimated values of the lower limit average termination rate coefficient displayed no dependence on the UV light intensity, with lower limit values between 2.6 × 108 L mol-1 s-1 and 6.3 × 108 L mol -1 s-1 for the UV light intensity range of 280 to 700 W. The deduced values for the average termination rate coefficient were above the expected values for comparable average termination rate coefficients. © 2013 American Chemical Society.

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ID Code: 99354
Item Type: Journal Article
Refereed: Yes
Additional Information: Cited By :4
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), Engesserstrasse 18, 76128 Karlsruhe, Germany; email: christopher.barner-kowollik@kit.edu
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Keywords: Mechanistic studies, Monomer conversions, Nitrile butadiene rubber, Polymerization temperature, Radical copolymerization, Rate coefficients, Termination rate coefficients, UV light intensity, Butadiene, Copolymerization, Copolymers, Polymer blends
DOI: 10.1021/ma4000896
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: 29 Sep 2016 04:41

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