Journal
POLYMER BULLETIN
Volume 70, Issue 9, Pages 2645-2656Publisher
SPRINGER
DOI: 10.1007/s00289-013-0980-6
Keywords
CRYSTAF; Styrene; Copolymerization; Polyethylene; Crystallinity; Metallocene
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Funding
- Center of Research Excellence in Petroleum Refining and Petrochemicals, King Fahd University of Petroleum and Minerals
- King Abdulaziz City for Science and Technology (KACST)
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Ethylene homo polymer and ethylene-styrene copolymers were synthesized using Cp2ZrCl2 (1)/methyl aluminoxane (MAO) and rac-silylene-bis (indenyl) zirconium dichloride (2)/MAO catalyst systems by varying styrene concentration and reaction conditions. Crystallization analysis fractionation (CRYSTAF), DSC, FTIR and H-1 NMR spectroscopy were used for characterizing the synthesized polymers. Interestingly, styrene was able to increase the activity of 1/MAO and 2/MAO catalyst systems at low concentrations, but at higher concentrations the activity decreases. The 1/MAO system at low and high pressure was unable to incorporate styrene, and the final product was pure polyethylene. On the other hand, with 2/MAO polymerization of ethylene and styrene yielded copolymer containing both styrene and ethylene. Results obtained from CRYSTAF and DSC reveal that on using 1/MAO system at high pressure, the resulting polymer in the presence of styrene has similar crystallinity as the polymer produced without styrene. Using both 1/MAO at low pressure and 2/MAO leads to decrease in crystallinity with increase in styrene concentration, even though the former does not incorporate styrene.
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