Relation between molecular structure and flow instability for ethylene/α-olefin copolymers

Document Type

Article

Publication Date

8-2-2002

Abstract

Surface instabilities in a capillary extrusion have been studied for various ethylene/α-olefin copolymers. It is found that the onset stress of shark-skin failure for ethylene/1-hexene copolymer (EHR) decreases rapidly with increasing 1-hexene content, whereas that of ethylene/propylene copolymer (EPR) is independent of propylene content in the experimental region. Consequently, EHR with high 1-hexene content exhibits shark-skin at low stress level compared to EPR. Lower rubbery plateau modulus, leading to higher Deborah number at the same stress level, is attributed to the lower onset stress. Further, the low entanglement density will cause cracks at lower stress level like glassy polymers, which is also responsible for the low onset stress for shark-skin. © 2002 Elsevier Science Ltd. All rights reserved.

Identifier

0037008643 (Scopus)

Publication Title

Polymer

External Full Text Location

https://doi.org/10.1016/S0032-3861(02)00373-7

ISSN

00323861

First Page

5249

Last Page

5255

Issue

19

Volume

43

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