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Journal of Polymer Research

Erschienen in:

01.06.2014 | Original Paper

Facile preparation of bimodal polyethylene with tunable molecular weight distribution from ethylene polymerization catalyzed by binary catalytic system in the presence of diethyl zinc

verfasst von: Yulai Zhao, Li Wang, Haojie Yu, Guanghui Jing, Chao Li, Yongsheng Chen, Muhammad Saleem

Erschienen in: Journal of Polymer Research | Ausgabe 6/2014

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Abstract

This contribution reported a facile approach to bimodal polyethylene (BMPE) with a consecutively tunable molecular weight distribution (MWD). The BMPEs were synthesized from ethylene polymerization catalyzed by α-diimine Ni complex/rac-ethylenebis(indenyl) zirconium chloride (rac-Et(Ind)₂ZrCl₂)/MAO in the presence of diethyl zinc (ZnEt₂). From GPC results, PE samples with molecular weight (MW) ranging from 78.9 kg/mol to 1.5 kg/mol and PDI varying gradually from 2.5 to 12.7 were obtained via simply adjusting the equiv. of ZnEt₂. The combination of Soxhlet extraction and GPC analysis indicated that the obtained BMPEs consist of soluble fractions with higher molecular weights and residual fractions with lower molecular weights. The crystallization processes and crystal morphologies of the BMPEs were recorded by polarized optical microscope (POM). Additionally, the influence of the obtained BMPE on the mechanical properties of commercial high density polyethylene (HDPE) after melt blending was studied via dynamic mechanical analysis (DMA).

Vorheriger Artikel Preparation of a surface molecularly imprinted fiber for bisphenol a recognition

Nächster Artikel Synthesis, structure and behavior of new polycaprolactam copolymers based on poly (ethylene oxide)–poly (propylene oxide)–poly (ethylene oxide) macroactivators derived from Pluronic block copolymers

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Titel: Facile preparation of bimodal polyethylene with tunable molecular weight distribution from ethylene polymerization catalyzed by binary catalytic system in the presence of diethyl zinc
verfasst von: Yulai Zhao
Li Wang
Haojie Yu
Guanghui Jing
Chao Li
Yongsheng Chen
Muhammad Saleem
Publikationsdatum: 01.06.2014
Verlag: Springer Netherlands
Erschienen in: Journal of Polymer Research / Ausgabe 6/2014
Print ISSN: 1022-9760
Elektronische ISSN: 1572-8935
DOI: https://doi.org/10.1007/s10965-014-0470-z

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