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Medientyp: E-Artikel Titel: Kinetic study of copper(I)‐catalyzed click chemistry step‐growth polymerization Beteiligte: Binauld, Sandra; Boisson, Fernande; Hamaide, Thierry; Pascault, Jean‐Pierre; Drockenmuller, Eric; Fleury, Etienne Erschienen: Wiley, 2008 Erschienen in: Journal of Polymer Science Part A: Polymer Chemistry, 46 (2008) 16, Seite 5506-5517 Sprache: Englisch DOI: 10.1002/pola.22871 ISSN: 0887-624X; 1099-0518 Schlagwörter: Materials Chemistry ; Organic Chemistry ; Polymers and Plastics Entstehung: Anmerkungen: Beschreibung: AbstractOligomers and polymers containing triazole units were synthesized by the copper(I)‐catalyzed 1,3‐dipolar cycloaddition step‐growth polymerization of four difunctional azides and alkynes. In a first part, monofunctional benzyl azide was used as a chain terminator for the polyaddition of 1,6‐diazidohexane and α,ω‐bis(O‐propargyl)diethylene glycol, leading to polytriazole oligomers of controlled average degree of polymerization (DPn = 3–20), to perform kinetic studies on low‐viscosity compounds. The monitoring of the step‐growth click polymerization by 1H NMR at 25, 45, and 60 °C allowed the determination of the activation energy of this click chemistry promoted polyaddition process, that is, Ea = 45 ± 5 kJ/mol. The influence of the catalyst content (0.1–5 mol % of Cu(PPh3)3Br according to azide or alkyne functionalities) was also examined for polymerization kinetics performed at 60 °C. In a second part, four high molar mass polytriazoles were synthesized from stoichiometric combinations of diazide and dialkyne monomers above with p‐xylylene diazide and α,ω‐bis(O‐propargyl)bisphenol A. The resulting polymers were characterized by DSC, TGA, SEC, and 1H NMR. Solubility and thermal properties of the resulting polytriazoles were discussed based on the monomers chemical structure and thermal analyses. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 5506–5517, 2008