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Article

Rheological Behavior of Blends of Metallocene Catalyzed Long-Chain Branched Polyethylenes. Part I: Shear Rheological and Thermorheological Behavior

College of Materials Science and Engineering, Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, Nanshan District Key Laboratory for Biopolymers and Safety Evaluation, Shenzhen University, Shenzhen 518055, China
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Academic Editor: Helmut Münstedt
Polymers 2021, 13(3), 328; https://doi.org/10.3390/polym13030328
Received: 10 December 2020 / Revised: 12 January 2021 / Accepted: 15 January 2021 / Published: 20 January 2021
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′, G″, and especially δ. Ea(δ), 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. View Full-Text
Keywords: polyethylenes; blends; long-chain branches; thermorheological complexity; activation energy spectrum polyethylenes; blends; long-chain branches; thermorheological complexity; activation energy spectrum
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MDPI and ACS Style

Chen, C.; Shekh, M.I.; Cui, S.; Stadler, F.J. Rheological Behavior of Blends of Metallocene Catalyzed Long-Chain Branched Polyethylenes. Part I: Shear Rheological and Thermorheological Behavior. Polymers 2021, 13, 328. https://doi.org/10.3390/polym13030328

AMA Style

Chen C, Shekh MI, Cui S, Stadler FJ. Rheological Behavior of Blends of Metallocene Catalyzed Long-Chain Branched Polyethylenes. Part I: Shear Rheological and Thermorheological Behavior. Polymers. 2021; 13(3):328. https://doi.org/10.3390/polym13030328

Chicago/Turabian Style

Chen, Chuangbi, Mehdihasan I. Shekh, Shuming Cui, and Florian J. Stadler. 2021. "Rheological Behavior of Blends of Metallocene Catalyzed Long-Chain Branched Polyethylenes. Part I: Shear Rheological and Thermorheological Behavior" Polymers 13, no. 3: 328. https://doi.org/10.3390/polym13030328

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