Ethylene-Propene Copolymerization with <italic style="font-style: italic">C</italic><sub>1</sub>-symmetric <italic style="font-style: italic">ansa</italic>-Fluorenyl-zirconocene Catalysts: Effects of Catalyst Structure and Comonomer on Molar Mass

Simona Losio; Laura Boggioni; Massimiliano Cornelio; Abbas Razavi; Incoronata Tritto

doi:10.1007/s10118-020-2348-3

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Ethylene-Propene Copolymerization with C₁-symmetric ansa-Fluorenyl-zirconocene Catalysts: Effects of Catalyst Structure and Comonomer on Molar Mass

ARTICLE | Updated：2019-11-07

- Ethylene-Propene Copolymerization with C₁-symmetric ansa-Fluorenyl-zirconocene Catalysts: Effects of Catalyst Structure and Comonomer on Molar Mass
- Chinese Journal of Polymer Science Vol. 38, Issue 3, Pages: 220-230(2020)
- Affiliations：
  
  a.CNR – Istituto di Scienze e Tecnologie Chimiche “G. Natta” (CNR-SCITEC), via Alfonso Corti 12, - 20133 Milano, Italy
  b.Total Petrochemicals Research, Zone Industrielle C, B-7181 Feluy, Belgium
- Author bio：
  
  tritto@ismac.cnr.it
- Funds：
- DOI：10.1007/s10118-020-2348-3
  CLC：
- Received：28 June 2019，
  
  Revised：2019-8-17，
  
  Accepted：29 August 2019，
  
  Online First：07 November 2019，
  
  Published：2020-03
- Accepted：
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Losio, S.; Boggioni, L.; Cornelio, M.; Razavi, A.; Tritto, I. Ethylene-propene copolymerization with , C,₁-symmetric , ansa,-fluorenyl-zirconocene catalysts: effects of catalyst structure and comonomer on molar mass. Chinese J. Polym. Sci. 2020, 38, 220–230. DOI: 10.1007/s10118-020-2348-3.

Simona Losio, Laura Boggioni, Massimiliano Cornelio, et al. Ethylene-Propene Copolymerization with C₁-symmetric ansa-Fluorenyl-zirconocene Catalysts: Effects of Catalyst Structure and Comonomer on Molar Mass[J]. Chinese Journal of Polymer Science, 2020, 38(3): 220-230. DOI: 10.1007/s10118-020-2348-3.
Losio, S.; Boggioni, L.; Cornelio, M.; Razavi, A.; Tritto, I. Ethylene-propene copolymerization with , C,₁-symmetric , ansa,-fluorenyl-zirconocene catalysts: effects of catalyst structure and comonomer on molar mass. Chinese J. Polym. Sci. 2020, 38, 220–230. DOI: 10.1007/s10118-020-2348-3. DOI：

Simona Losio, Laura Boggioni, Massimiliano Cornelio, et al. Ethylene-Propene Copolymerization with C₁-symmetric ansa-Fluorenyl-zirconocene Catalysts: Effects of Catalyst Structure and Comonomer on Molar Mass[J]. Chinese Journal of Polymer Science, 2020, 38(3): 220-230. DOI: 10.1007/s10118-020-2348-3. DOI：

摘要

Abstract

Ethylene-propene copolymers have been synthesized by three

-symmetric metallocene molecules (

and

)

having

tert

-butyl substituents on the Cp moiety

on the fluorenyl moiety

or on both moieties

and methylaluminoxane (MAO) at different polymerization temperatures and monomer concentrations. Copolymers were investigated by

C-NMR

H-NMR

and SEC analyses. A relationship was found between [EEE]/[E]

ratios and copolymer molar masses in each series: the higher the [EEE]/[E]

ratio

the lower the copolymer molar mass. At parity of [EEE]/[E]

ratio

copolymer molar mass follows the order

. Chain end group analysis reveals that copolymers mainly terminate when propene is the last inserted unit

confirming that it is the greater facility of Mt-P-E-poly(E-

-P) to terminate that influences the copolymer molar mass. Among the catalysts considered

catalyst

which gives syndiospecific polypropene

gives greater activities

comonomer incorporation

and molar masses. Catalyst

which gives isospecific polypropene

in copolymerization performs better than

having the same bridge

with respect to activities

ethylene content

and molar masses. The good performance of this catalyst arises from the not necessity of polymer chain to back skip when ethylene is the last inserted unit.

关键词

Keywords

references

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⁰

Ethylene-Propene Copolymerization with C1-symmetric ansa-Fluorenyl-zirconocene Catalysts: Effects of Catalyst Structure and Comonomer on Molar Mass

DOI：10.1007/s10118-020-2348-3

摘要

Abstract

关键词

Keywords

references

Ethylene-Propene Copolymerization with C₁-symmetric ansa-Fluorenyl-zirconocene Catalysts: Effects of Catalyst Structure and Comonomer on Molar Mass