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

Content Provider	Springer Nature Link
Author	Kamal, Muhammad Shahzad Bahuleyan, Bijal Kottukkal Sohail, Omer Bin Emwas, Abdul Hamid M. Bercaw, John E. Al Harthi, Mamdouh A.
Copyright Year	2013
Abstract	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.
Starting Page	2645
Ending Page	2656
Page Count	12
File Format	PDF
ISSN	01700839
Journal	Polymer Bulletin
Volume Number	70
Issue Number	9
e-ISSN	14362449
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-06-06
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	CRYSTAF Styrene Copolymerization Polyethylene Crystallinity Metallocene Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Characterization and Evaluation of Materials Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Condensed Matter Physics Polymers and Plastics

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