Hydroxytelechelic hydrocarbon copolymers with high aging resistance for elastomeric materials

• Published in: Journal of applied polymer science Vol. 118; no. 3; pp. 1830 - 1836
• Main Authors: Gascon, Claire, Lucas, Frederic, Carlotti, Stephane, Deffieux, Alain
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 05.11.2010; Wiley
• Subjects: aging resistance; Applied sciences; Chain transfer; Chemical Sciences; Copolymerization; Copolymers; Exact sciences and technology; Hydrocarbons; hydroxytelechelic; low glass transition temperature; Olefins; Organic polymers; Physicochemistry of polymers; polyalkenamers; Polymers; Preparation, kinetics, thermodynamics, mechanism and catalysts; Reproduction; Stability; Viscosity; Viscosity measurement; Thermal ageing; aging resistance; Telechelic polymer; Cycloalkene polymer; Experimental study; Complex catalyst copolymerization; hydroxytelechelic; Cyclodiene polymer; Oxidation resistance; low glass transition temperature; Cycloalkene copolymer; Alkenamer polymer; Metathesis polymerization; Unsaturated copolymer; Hydroxyl group; Ruthenium Complexes; polyalkenamers; Unsaturated polymer; Chemical properties; Alkenamer copolymer; Ring opening copolymerization; Apparent viscosity; Rheological properties
• ISSN: 0021-8995; 1097-4628; 1097-4628
• DOI: 10.1002/app.32535

Dihydroxytelechelic copolyalkenamers were prepared via metathetical polymerization of cyclic olefins (cyclooctadiene, cyclooctene and cyclododecene) in presence of first generation Grubbs catalyst and butene diacetate as functionalizing chain transfer agent in order to study their aging resistance. The influence of compositions and molar masses of the copolyalkenamers were investigated in terms of thermo-mechanical properties. Increasing chains length or the proportion of polycyclooctadiene allow to get non-cristalline polymers. Low Tg materials (between -78°C and -108°C) were prepared. The resistance towards oxidation of the different copolyalkenamers was carried out using a viscosity measurement method. A critical time, corresponding to a brutal increase of the apparent viscosity, was related to degradation of the polymers and was shown to be dependent on the Csp² proportion in the structure. The absence of vinylic units and the decrease of the double bonds content within the copolymers were proved to enhance the stability of the copolyalkenamers towards aging resistance.