TY - JOUR
T1 - Design your own elastomeric or stereoregular polymer
AU - Shmulinson, Michal
AU - Volkis, Victoria
AU - Lisovskii, Anatoli
AU - Nelkenbaum, Elza
AU - Eisen, Moris S.
N1 - Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
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
UR - http://www.scopus.com/inward/record.url?scp=0036826182&partnerID=8YFLogxK
U2 - 10.1002/pat.256
DO - 10.1002/pat.256
M3 - 文章
AN - SCOPUS:0036826182
VL - 13
SP - 823
EP - 829
JO - Polymers for Advanced Technologies
JF - Polymers for Advanced Technologies
SN - 1042-7147
IS - 10-12
ER -