Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5203982 | Polymer Degradation and Stability | 2009 | 7 Pages |
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 125,000Â 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.
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Authors
Claudio J. Pérez, N. Villarreal, J.M. Pastor, M.D. Failla, E.M. Vallés, J.M. Carella,