Effect of the vinyl concentration on the structural and rheological characteristics of peroxide-modified high-density polyethylenes

The effect of the hydrogenation of the terminal vinyl groups on the peroxide modification and rheological properties of high‐density polyethylene (HDPE) was investigated. The aim of the study was to determine exclusively the effect of the terminal vinyl groups on the peroxide crosslinking and rheolo...

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Bibliographic Details
Published in:Journal of applied polymer science 2010-02, Vol.115 (4), p.1942-1951
Main Authors: Aigbodion, Aireguamen I., Ressia, Jorge A., Ciolino, Andrés E., Failla, Marcelo D., Vallés, Enrique M.
Format: Article
Language:English
Subjects:
Applied sciences
Chemical reactions and properties
Crosslinking
Crosslinking, vulcanization
Exact sciences and technology
Hydrogenation
Infrared spectroscopy
Organic polymers
Peroxides
Physicochemistry of polymers
polyethylene (PE)
Polyethylenes
Rheological properties
rheology
Terminals
viscoelastic properties
Viscosity
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Summary:The effect of the hydrogenation of the terminal vinyl groups on the peroxide modification and rheological properties of high‐density polyethylene (HDPE) was investigated. The aim of the study was to determine exclusively the effect of the terminal vinyl groups on the peroxide crosslinking and rheological properties of HDPE with one polymer type. This was achieved by hydrogenation of the terminal vinyl groups of a commercial HDPE to obtain an identical material from a structural point of view, which differed only in the nature of the terminal unsaturations, and the comparison of its level of peroxide crosslinking with that of the original polymer. Hydrogenated and unhydrogenated polymer samples were modified at 170°C with different amounts of organic peroxide ranging from 125 to 5000 ppm. Changes in the molecular structure were determined by Fourier transform infrared spectroscopy, size exclusion chromatography, and rheological measurements. Hydrogenation of the terminal groups of the original polymer significantly reduced the rate of modification or crosslinking. The dynamic viscosity and elasticity increased with the level of peroxide modification. Unhydrogenated samples exhibited rapid increases in viscosity and elastic modulus, whereas their hydrogenated counterparts required about 500% of the amount of peroxide needed for the unhydrogenated sample to attain similar structural changes. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010
ISSN:0021-8995
1097-4628
1097-4628
DOI:10.1002/app.31155