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Rheological Study of Linear High Density Polyethylenes Modified with Organic Peroxide by Claudio J Pérez; Guillermo A Cassano; Enrique M Vallés; Marcelo D Failla; Lidia M Quinzani is a Materials Science article available to read on EtoBox.

What is Rheological Study of Linear High Density Polyethylenes Modified with Organic Peroxide about?

Four high density polyethylenes were modi®ed using different concentrations of an organic peroxide in order to change their molecular structure. The effects of the presence of vinyl groups in the original polymer molecules and of the peroxide concentration used in the modi®cation process were analyzed. All the concentrations of peroxide used in this study were below the critical concentration that produces a macroscopic molecular network. The weight-average molecular weight of all the polyethylenes augments and the molecular weight distribution gets wider as the concentration of peroxide increases. These results support the general belief that the chain-linking reactions dominate the modi®cation process. Evidence of the important role played by the vinyl groups is found not only in the change of the width of the chromatograms but also in the position of their maximums. The vinyl-containing polymers display the largest molecular changes for a given peroxide content. The magnitude of the viscous and elastic moduli of the polyethylenes goes up as the concentration of peroxide used increases showing the effect of the generated large molecules. The linear viscoelastic response of the mo

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Author

Claudio J Pérez; Guillermo A Cassano; Enrique M Vallés; Marcelo D Failla; Lidia M Quinzani

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0032-3861)

Published

2002

Language

EN

Field

Materials Science (Physical Sciences)