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The use of SSA fractionation to detect changes in the molecular structure of model ethylene-butene copolymers modified by peroxide crosslinking |
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| Authors: | Claudio J. Pé rez,N. Villarreal,M.D. Failla,J.M. Carella |
| Affiliation: | a Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA) (UNMdP-CONICET), Facultad de Ingeniería, Universidad Nacional de Mar del Plata, Juan B. Justo 4302, 7600 Mar del Plata, Argentina b CIDAUT, Foundation for Research and Development in Transport and Energy, Parque Tecnológico de Boecillo P. 209, 47151 Boecillo, Valladolid, Spain c Departamento de Física de la Materia Condensada, E.T.S.I.I., Universidad de Valladolid, 47011 Valladolid. Spain d Planta Piloto de Ingeniería Química-PLAPIQUI (UNS-CONICET), Camino “La Carrindanga” Km 7, 8000 Bahía Blanca, Argentina |
| Abstract: | Four model ethylene-butene copolymers of different molecular weights modified with various concentrations of peroxide were analyzed by a DSC based successive self annealing method. The original copolymers had the same intra and intermolecular homogeneous branching distribution along the linear chains with approximately 2.4% mol of ethyl branches. The copolymers with average molecular weights of 29,000, 45,000, 81,000 and 125,000 g/mol were modified with different amounts of 2,5-dimethyl-2,5-di(tert-butyl peroxy)-hexane (DBPH) as a crosslinking initiator. The molecular changes induced by the reaction with the peroxide affect the semicrystalline structure of the material. Variations in the crystal thickness distributions of the material as a consequence of the modification are related to the peroxide induced free radical reactions. |
| Keywords: | Ethylene-butene copolymers Organic peroxide Crosslinking Successive self-nucleation and annealing |
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