Multi-block polyurethanes via RAFT end-group switching and their characterization by advanced hyphenated techniques

Schmid, C., Falkenhagen, J., Beskers, T. F., Nguyen, L. T. T., Wilhelm, M., Du Prez, F. E., & Barner-Kowollik, C. (2012) Multi-block polyurethanes via RAFT end-group switching and their characterization by advanced hyphenated techniques. Macromolecules, 45(16).

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The detailed characterization of poly(styrene)-b-poly(tetrahydrofuran) (pS-b-pTHF) multiblock copolymers (17800 g mol -1≥ M n ≥ 46800 g mol -1) generated via urethane linkages is presented. The synthesis of the block copolymers is enabled via a mechanistic switch of the thiocarbonyl thio end group of a poly(styrene) to dihydroxyl terminated polymers that subsequently react with a diisocyanate terminated polytetrahydrofuran based prepolymer to form multiblock copolymer structures. The characterization of the multiblock copolymers and their substructures includes size exclusion chromatography (SEC), liquid chromatography at critical conditions (LCCC), nuclear magnetic resonance (NMR), and infrared (IR) spectroscopy as well as matrix-assisted laser desorption/ionization (MALDI) mass spectrometry. To obtain even further details of the polymer size and its composition, SEC with triple detection as well as newly developed SEC coupled online to IR spectroscopy was carried out. The quantification of the average block fractions via online SEC-IR (41-61 mol % pTHF) is in very good agreement with the results obtained via NMR spectroscopy (39-66 mol % pTHF). © 2012 American Chemical Society.

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ID Code: 99320
Item Type: Journal Article
Refereed: Yes
Additional Information: Cited By :9
Export Date: 5 September 2016
Correspondence Address: Du Prez, F.E.; Polymer Chemistry Research Group, Department of Organic Chemistry, Ghent University, Krijgslaan 281 S4, B-9000 Ghent, Belgium; email:
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Keywords: Diisocyanates, End groups, Hyphenated techniques, Liquid chromatography at critical conditions, Matrix-assisted laser desorption/ionization mass spectrometry, Multiblock copolymer, Polymer sizes, Polytetrahydrofuran, Prepolymers, Tetra-hydrofuran, Thiocarbonyl, Urethane linkage, Block copolymers, Furan resins, Liquid chromatography, Mass spectrometry, Nuclear magnetic resonance spectroscopy, Polymers, Styrene, Characterization
DOI: 10.1021/ma301117k
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: 04 Oct 2016 23:05

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