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Shear and elongational rheology of linear low density polyethylenes with different structures

✍ Scribed by A. Valenza; F.P. La Mantia; D. Acierno

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
276 KB
Volume
24
Category
Article
ISSN
0014-3057

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✦ Synopsis

Shear, isothermal and non-isothermal elongational data have been collected for a wide range of linear low density polyethylenes with different structures. In particular the samples differ both in molecular weight and in the comonomer. All the data show that the rheological behaviour is strongly affected by the molecular weight but only slightly influenced by the nature of the comonomer. Only the non-Newtonian behaviour in shear flow seems appreciably dependent on the length of the chain in the comonomer.

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✍ Xiao-Qi Zhou; J.N. Hay πŸ“‚ Article πŸ“… 1993 πŸ› Elsevier Science 🌐 English βš– 672 KB

Three commercial LLDPE samples with ethyl, hexyl and isobutyl branches were fractioned by cross chromatographic fractionation methods, i.e. a combination of SEC and TREF techniques. The fractions with different molecular weight distribution (MWD) and short chain branching distribution (SCB) were obt