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Krause, B. ; Häußler, L. ; Voigt, D.
Comparison of the Molecular Properties and Morphology of Polypropylenes Irradiated under Different Atmospheres and after Annealing

Electron-beam irradiation, a well-known way of generating long-chain branching, was used to modify polypropylene. Samples were investigated with differential scanning calorimetry, polarized light microscopy, and size exclusion chromatography. Independently of the atmosphere, postannealing led to the deactivation of residual radicals and to the reduction of the nucleus density. In comparison with the initial polypropylene, the crystallization temperatures increased for nonannealed samples but decreased for annealed samples. Stable products were obtained only by irradiation in nitrogen followed by annealing. A reaction including free radicals with oxygen in the ambient atmosphere led to increasing molar mass degradation and the formation of long-chain branching after storage. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 634-639, 2006

Source
Journal of Applied Polymer Science 100

Pages
634-639

DOI
http://dx.doi.org/10.1002/app.23384

Published
February 2006
 
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Functional Nanocomposites and Blends

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