Design your own elastomeric or stereoregular polymer

Michal Shmulinson; Victoria Volkis; Anatoli Lisovskii; Elza Nelkenbaum; Moris S. Eisen

doi:10.1002/pat.256

Design your own elastomeric or stereoregular polymer

Michal Shmulinson, Victoria Volkis, Anatoli Lisovskii, Elza Nelkenbaum, Moris S. Eisen^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

This study reports the synthesis and activity as precatalysts for the polymerization of propylene of five racemic group 4 complexes, R' = CH₃, R = SiMe₃, M = Zr, X = Cl (2); R' = H, R = i-pr, M = Zr, X = Cl (3); R' = CH₃, R = SiMe₃, M = Zr, X = CH₃ (4)) and (acac)₂MCl₂ (M = Ti (5), M = Zr (6)) (acac = acetylacetone). The hydrocarbyl complex 4 was prepared by the alkylation of the corresponding complex 2 with MeLi·LiBr. Reaction of complex 4 with B(C₆F₅)₃ or all complexes with MAO (MAO = methylalumoxane) results in the formation of a "cationic" intermediate complex which rapidly reacts with the incoming monomer. Some of the complexes catalyze the stereoregular polymerization of propylene only under pressure in either toluene or CH₂Cl₂, producing polypropylene with very large isotacticities (mmmm % = ∼95-98), high melting points (140-154°C) and similar molecular weights as compared with cyclopentadienyl complexes, whereas complex 5 is active for the polymerization of elastomeric polypropylene.

Original language	English
Pages (from-to)	823-829
Number of pages	7
Journal	Polymers for Advanced Technologies
Volume	13
Issue number	10-12
DOIs	https://doi.org/10.1002/pat.256
State	Published - 2002
Externally published	Yes

Keywords

Acetylacetone metal complexes
Benzamidinate metal complexes
Elastomeric polypropylene
Stereoregular polymerization

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title = "Design your own elastomeric or stereoregular polymer",

abstract = "This study reports the synthesis and activity as precatalysts for the polymerization of propylene of five racemic group 4 complexes, R' = CH3, R = SiMe3, M = Zr, X = Cl (2); R' = H, R = i-pr, M = Zr, X = Cl (3); R' = CH3, R = SiMe3, M = Zr, X = CH3 (4)) and (acac)2MCl2 (M = Ti (5), M = Zr (6)) (acac = acetylacetone). The hydrocarbyl complex 4 was prepared by the alkylation of the corresponding complex 2 with MeLi·LiBr. Reaction of complex 4 with B(C6F5)3 or all complexes with MAO (MAO = methylalumoxane) results in the formation of a {"}cationic{"} intermediate complex which rapidly reacts with the incoming monomer. Some of the complexes catalyze the stereoregular polymerization of propylene only under pressure in either toluene or CH2Cl2, producing polypropylene with very large isotacticities (mmmm % = ∼95-98), high melting points (140-154°C) and similar molecular weights as compared with cyclopentadienyl complexes, whereas complex 5 is active for the polymerization of elastomeric polypropylene.",

keywords = "Acetylacetone metal complexes, Benzamidinate metal complexes, Elastomeric polypropylene, Stereoregular polymerization",

author = "Michal Shmulinson and Victoria Volkis and Anatoli Lisovskii and Elza Nelkenbaum and Eisen, {Moris S.}",

year = "2002",

doi = "10.1002/pat.256",

language = "英语",

volume = "13",

pages = "823--829",

journal = "Polymers for Advanced Technologies",

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T1 - Design your own elastomeric or stereoregular polymer

AU - Shmulinson, Michal

AU - Volkis, Victoria

AU - Lisovskii, Anatoli

AU - Nelkenbaum, Elza

AU - Eisen, Moris S.

PY - 2002

Y1 - 2002

N2 - This study reports the synthesis and activity as precatalysts for the polymerization of propylene of five racemic group 4 complexes, R' = CH3, R = SiMe3, M = Zr, X = Cl (2); R' = H, R = i-pr, M = Zr, X = Cl (3); R' = CH3, R = SiMe3, M = Zr, X = CH3 (4)) and (acac)2MCl2 (M = Ti (5), M = Zr (6)) (acac = acetylacetone). The hydrocarbyl complex 4 was prepared by the alkylation of the corresponding complex 2 with MeLi·LiBr. Reaction of complex 4 with B(C6F5)3 or all complexes with MAO (MAO = methylalumoxane) results in the formation of a "cationic" intermediate complex which rapidly reacts with the incoming monomer. Some of the complexes catalyze the stereoregular polymerization of propylene only under pressure in either toluene or CH2Cl2, producing polypropylene with very large isotacticities (mmmm % = ∼95-98), high melting points (140-154°C) and similar molecular weights as compared with cyclopentadienyl complexes, whereas complex 5 is active for the polymerization of elastomeric polypropylene.

AB - This study reports the synthesis and activity as precatalysts for the polymerization of propylene of five racemic group 4 complexes, R' = CH3, R = SiMe3, M = Zr, X = Cl (2); R' = H, R = i-pr, M = Zr, X = Cl (3); R' = CH3, R = SiMe3, M = Zr, X = CH3 (4)) and (acac)2MCl2 (M = Ti (5), M = Zr (6)) (acac = acetylacetone). The hydrocarbyl complex 4 was prepared by the alkylation of the corresponding complex 2 with MeLi·LiBr. Reaction of complex 4 with B(C6F5)3 or all complexes with MAO (MAO = methylalumoxane) results in the formation of a "cationic" intermediate complex which rapidly reacts with the incoming monomer. Some of the complexes catalyze the stereoregular polymerization of propylene only under pressure in either toluene or CH2Cl2, producing polypropylene with very large isotacticities (mmmm % = ∼95-98), high melting points (140-154°C) and similar molecular weights as compared with cyclopentadienyl complexes, whereas complex 5 is active for the polymerization of elastomeric polypropylene.

KW - Acetylacetone metal complexes

KW - Benzamidinate metal complexes

KW - Elastomeric polypropylene

KW - Stereoregular polymerization

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U2 - 10.1002/pat.256

DO - 10.1002/pat.256

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ER -

Design your own elastomeric or stereoregular polymer

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Keywords

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