Crystallization analysis fractionation of poly(ethylene-co-styrene) produced by metallocene catalysts

被引:0
|
作者
Muhammad Shahzad Kamal
Bijal Kottukkal Bahuleyan
Omer Bin Sohail
Abdul-Hamid M. Emwas
John E. Bercaw
Mamdouh A. Al-Harthi
机构
[1] King Fahd University of Petroleum and Minerals,Department of Chemical Engineering
[2] King Fahd University of Petroleum and Minerals,Center of Research Excellence in Petroleum Refining and Petrochemicals
[3] King Abdullah University of Science and Technology,NMR Core Lab
[4] Tokyo Metropolitan University,Department of Chemistry
[5] California Institute of Technology,Arnold and Mabel Beckman Laboratories of Chemical Synthesis
来源
Polymer Bulletin | 2013年 / 70卷
关键词
CRYSTAF; Styrene; Copolymerization; Polyethylene; Crystallinity; Metallocene;
D O I
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中图分类号
学科分类号
摘要
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 1H 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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页码:2645 / 2656
页数:11
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