The effect of chain architecture on "sharkskin" of metallocene polyethylenes

Authors
Fernandez, M Vega, JF Santamaria, A Munoz-Escalona, A Lafuente, P
Citation
M. Fernandez et al., The effect of chain architecture on "sharkskin" of metallocene polyethylenes, MACRO RAPID, 21(14), 2000, pp. 973-978
Citations number
36
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
MACROMOLECULAR RAPID COMMUNICATIONS
ISSN journal
10221336 → ACNP
Volume
21
Issue
14
Year of publication
2000
Pages
973 - 978
Database
ISI
SICI code
1022-1336(20000928)21:14<973:TEOCAO>2.0.ZU;2-W
Abstract
Dynamic viscoelastic and extrusion capillary results of metallocene based p olyethylenes are analyzed. Three samples show very high viscosities at low frequencies and large relaxation times, which is a symptom of the presence of small amounts of long chain branching (LCB). A linear correlation is fou nd between the sharkskin dynamics (periodicity) and a characteristic entang lement-disentanglement time. It is found that this correlation does not hol d for samples suspected of LCB.