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Volumn 42, Issue 13, 2009, Pages 4585-4595

Copolymerization of ethylene with α-olefins containing various substituents catalyzed by half-titanocenes: Factors affecting the monomer reactivities

Author keywords

[No Author keywords available]

Indexed keywords

1-DODECENE; 1-HEXADECENE; 1-PENTENE; CATALYST STRUCTURES; CATALYST SYSTEM; CATALYTIC ACTIVITY; CATALYTICALLY ACTIVE SPECIES; CO-MONOMER; ETHYLENE COPOLYMERIZATION; HIGH MOLECULAR WEIGHT COPOLYMERS; MONOMER REACTIVITY; STERIC BULK; TITANOCENES; UNIMODAL;

EID: 67650470462     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma900576v     Document Type: Article
Times cited : (43)

References (89)
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    • 13C NMR spectra for the resultant copolymers including their peak assignments are shown in the Supporting Information.
    • 13C NMR spectra for the resultant copolymers including their peak assignments are shown in the Supporting Information.
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    • These copolymerizations were terminated at the initial stage, and termination with the comonomer conversion less than 10% should be very important to obtain the copolymers with uniform composition distribution
    • These copolymerizations were terminated at the initial stage, and termination with the comonomer conversion less than 10% should be very important to obtain the copolymers with uniform composition distribution.
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    • Although we have no firm direct confirmations concerning the rotation of the aryloxide ligands, Kang Korea Univ, et al. recently presented detailed study of the flexible rotation on the basis of NMR spectra and calculation results. Kim, T.-J, Kim, S. K, Hahn, J.-S, Ok, M.-A, Song, J. H, Shin, D.-H, Ko, J, Minserk, C, Mitoraj, M, Srebro, M, Michalak, A, Kang, S. O. Abstract in 102nd Korean Chemical Society National Meeting, Jeju, Korea, October 2008
    • Although we have no firm direct confirmations concerning the rotation of the aryloxide ligands, Kang (Korea Univ.) et al. recently presented detailed study of the flexible rotation on the basis of NMR spectra and calculation results. Kim, T.-J.; Kim, S. K.; Hahn, J.-S.; Ok, M.-A.; Song, J. H.; Shin, D.-H.; Ko, J.; Minserk, C.; Mitoraj, M.; Srebro, M.; Michalak, A.; Kang, S. O. Abstract in 102nd Korean Chemical Society National Meeting, Jeju, Korea, October 2008.
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    • For example, 3-methyl-l-butene (3M1B) content in the resultant copolymer in the ethylene/3MlB copolymerization was 9.9, 18.1 mol, respectively, when the copolymerizations by 4 were conducted under the initial molar ratios of [3M1B, E, 20, 49, respectively,260 whereas 3MlP content in the copolymer was 23.5 mol, when the copolymerization by 1 was conducted under the initial molar ratio of [3M1P, E, 3.62 (run 29, Table 4, The 3MlB contents were 0.2, 19.4 mol, respectively, when the copolymerizations by [Me2Si(indenyl)2]ZrCl2 were conducted under the initial molar ratio of [3M1B, E, 5,10, respectively. It is thus clear that 1 exceptionally efficient incorporates 3MlP (branched a-olefin) in the copolymerization, and should be effective for synthesis of high molecular weight copolymers with relatively high 3MlP contents
    • 260 whereas 3MlP content in the copolymer was 23.5 mol % when the copolymerization by 1 was conducted under the initial molar ratio of [3M1P]/[E] = 3.62 (run 29, Table 4). The 3MlB contents were 0.2, 19.4 mol %, respectively, when the copolymerizations by [Me2Si(indenyl)2]ZrCl2 were conducted under the initial molar ratio of [3M1B]/[E] = 5,10, respectively. It is thus clear that 1 exceptionally efficient incorporates 3MlP (branched a-olefin) in the copolymerization, and should be effective for synthesis of high molecular weight copolymers with relatively high 3MlP contents.
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    • Estimation of the rE values in the ethylene/3MlP copolymerizations by CGC (4, 75, 92) seemed difficult due to their low 3MlP contents, (runs 38-39, 3MlP 2.4, 3.0 mol %, respectively).
    • Estimation of the rE values in the ethylene/3MlP copolymerizations by CGC (4, 75, 92) seemed difficult due to their low 3MlP contents, (runs 38-39, 3MlP 2.4, 3.0 mol %, respectively).
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.