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Polymers 2016, 8(12), 433; doi:10.3390/polym8120433

Study on Hydrogen Sensitivity of Ziegler–Natta Catalysts with Novel Cycloalkoxy Silane Compounds as External Electron Donor

1
State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, the College of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
2
Petrochemical Research Institute, PetroChina, Beijing 102206, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Alexander Böker
Received: 9 November 2016 / Revised: 2 December 2016 / Accepted: 8 December 2016 / Published: 16 December 2016
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Abstract

Two novel cycloalkoxy silane compounds (ED1 and ED2) were synthesized and used as the external electron donors (EEDs) in Ziegler–Natta catalysts with diethyl 2,3-diisopropylsuccinate as internal electron donor. The results indicated that the Ziegler–Natta catalysts using ED1 and ED2 as EEDs had high catalytic activities and good stereoselectivities. The melt flow rate (MFR) and gel permeation chromatography (GPC) results revealed that the obtained polypropylene has higher MFR and lower average molecular weights than the commercial EED cyclohexyl methyl dimethoxysilane. The differential scanning calorimetry (DSC) results indicated that new isospecific active centers formed after the introduction of new external donors. The work implied that the novel EEDs could improve the hydrogen sensitivities of the catalyst system and obtain polymers with high melt flow rate. View Full-Text
Keywords: Ziegler–Natta catalyst; external electron donor; isotactic polypropylene; high melt flow rate polypropylene Ziegler–Natta catalyst; external electron donor; isotactic polypropylene; high melt flow rate polypropylene
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MDPI and ACS Style

Li, H.; Wang, J.; He, L.; Nan, F.; Wang, F.; Yang, W.; Zhang, M.; Sun, T.; Huang, Q.; Yi, J. Study on Hydrogen Sensitivity of Ziegler–Natta Catalysts with Novel Cycloalkoxy Silane Compounds as External Electron Donor. Polymers 2016, 8, 433.

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