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BibTeX
Rheological properties of bimodal polyethylenes produced with silica nanoparticle supported catalysts
Journal of applied polymer science, 2019-06, Vol.136 (21), p.n/a
Liu, Hao
Troisi, Enrico M.
Goossens, Johannes G. P.
Severn, John R.
Bastiaansen, Cees W. M.
2019
Volltextzugriff (PDF)
Details
Autor(en) / Beteiligte
Liu, Hao
Troisi, Enrico M.
Goossens, Johannes G. P.
Severn, John R.
Bastiaansen, Cees W. M.
Titel
Rheological properties of bimodal polyethylenes produced with silica nanoparticle supported catalysts
Ist Teil von
Journal of applied polymer science, 2019-06, Vol.136 (21), p.n/a
Ort / Verlag
Hoboken, USA: John Wiley & Sons, Inc
Erscheinungsjahr
2019
Quelle
Wiley Online Library All Journals
Beschreibungen/Notizen
ABSTRACT The rheological properties of bimodal ultra‐high‐molecular‐weight polyethylenes (UHMWPEs) are investigated with an emphasis on the influence of the catalyst support. Bimodal UHMWPEs were produced in a single reactor with double support (DS) and single support (SS) catalyst systems. Dynamic measurements showed that the SS samples have a higher storage modulus at low frequencies than the DS samples with the same weight average molecular weight. After extrusion, the storage modulus of the bimodal DS samples increased to an identical value. The results indicate that the SS sample has a higher homogeneity than the DS sample. The steady‐shear viscosities were measured to determine zero shear viscosities (η0) of the bimodal samples. The results show that the SS samples follow the relation η0 = KMwα with α = 3.19. However, the DS samples exhibit a substantial deviation from this relation especially in the intermediate Mw range around 1000 kg mol−1. The reason for the deviation is attributed to the heterogeneity in DS samples. The results demonstrate that the DS systems do not produce bimodal PEs with an intimate degree of mixing of short and long polymer chains even if silica nanoparticles are used as the support. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47577.
Sprache
Englisch
Identifikatoren
ISSN: 0021-8995
eISSN: 1097-4628
DOI: 10.1002/app.47577
Titel-ID: cdi_proquest_journals_2184103235
Format
–
Schlagworte
bimodal distribution
,
Catalysis
,
Catalysts
,
Deviation
,
Extrusion
,
Fish
,
heterogeneity
,
Materials science
,
Nanoparticles
,
Polyethylene
,
Polymers
,
Rheological properties
,
Rheology
,
Silicon dioxide
,
Storage modulus
,
Ultra high molecular weight polyethylene
,
zero shear viscosity
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