Rheological Behavior of Blends of Metallocene Catalyzed Long-Chain Branched Polyethylenes. Part I: Shear Rheological and Thermorheological Behavior
In: Polymers Volume 13 Issue 3 Polymers, Jg. 13 (2021-01-22), Heft 328, p 328
Online
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Zugriff:
Long-chain branched metallocene-catalyzed high-density polyethylenes (LCB-mHDPE) were solution blended to obtain blends with varying degrees of branching. A high molecular LCB-mHDPE was mixed with low molecular LCB-mHDPE at varying concentrations. The rheological behavior of those low molecular LCB-mHDPE is similar but their molar mass and molar mass distribution are significantly different. Those blends were characterized rheologically to study the effects of concentration, molar mass distribution, and long-chain branching level of the low molecular LCB-mHDPE. Owing to the ultra-long relaxation times of the high molecular LCB-mHDPE, the blends exhibited a clearly more long-chain branched behavior than the base materials. The thermorheological complexity analysis showed an apparent increase in the activation energies Ea determined from G&prime
G&Prime
and especially &delta
Ea(&delta
), which for LCB-mHDPE is a peak function, turned out to produce even more pronounced peaks than observed for LCB-mPE with narrow molar mass distribution and also LCB-mPE with broader molar mass distribution. Thus, it is possible to estimate the molar mass distribution from the details of the thermorheological complexity.
| Titel: |
Rheological Behavior of Blends of Metallocene Catalyzed Long-Chain Branched Polyethylenes. Part I: Shear Rheological and Thermorheological Behavior
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| Autor/in / Beteiligte Person: | Shekh, Mehdihasan I. ; Stadler, Florian J. ; Chen, Chuangbi ; Cui, Shuming |
| Link: | |
| Zeitschrift: | Polymers Volume 13 Issue 3 Polymers, Jg. 13 (2021-01-22), Heft 328, p 328 |
| Veröffentlichung: | Preprints, 2021 |
| Medientyp: | unknown |
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