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Volumn 32, Issue 7, 1999, Pages 2120-2130

Polymerization of propylene by a new generation of iron catalysts: Mechanisms of chain initiation, propagation, and termination

Author keywords

[No Author keywords available]

Indexed keywords

CATALYSIS; CATALYSTS; IRON; MOLECULAR STRUCTURE; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; POLYMERIZATION;

EID: 0033528618     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma981698s     Document Type: Article
Times cited : (338)

References (99)
  • 26
    • 0344821377 scopus 로고    scopus 로고
    • (DuPont) World Patent Application 98/ 27124, 1998
    • (a) Bennett, A. M. A. (DuPont) World Patent Application 98/ 27124, 1998.
    • Bennett, A.M.A.1
  • 30
    • 0345684219 scopus 로고    scopus 로고
    • (UNC) World Patent Application 98/30612, 1998
    • (b) Brookhart, M.; Small, B. L. (UNC) World Patent Application 98/30612, 1998.
    • Brookhart, M.1    Small, B.L.2
  • 31
    • 0344389679 scopus 로고    scopus 로고
    • note
    • MMAO is the same as MAO except for the substitution of 25% of the methyl groups with isobutyl groups. MMAO has the advantage of increased shelf life, but as is discussed in this paper, these isobutyl groups can affect the composition of the polymer end groups.
  • 46
    • 0344389670 scopus 로고    scopus 로고
    • note
    • There are numerous examples in the literature of complexes whose stereospecific behavior changes with modifications in the reaction conditions. See refs 1 and 14.
  • 65
    • 0344821361 scopus 로고    scopus 로고
    • note
    • 3; Z = 4; R = 0.044; GOF = 1.62.
  • 66
    • 0345252645 scopus 로고    scopus 로고
    • Doctoral Dissertation, University of North Carolina at Chapel Hill
    • (a) Tempel, D. J. Doctoral Dissertation, University of North Carolina at Chapel Hill, 1998.
    • (1998)
    • Tempel, D.J.1
  • 68
    • 0345252646 scopus 로고    scopus 로고
    • note
    • 3; Z = 4; R = 0.088; GOF = 4.90. Crystals of 6a were grown by allowing pentane to slowly diffuse into a solution of the complex in chlorobenzene.
  • 69
    • 0344821359 scopus 로고    scopus 로고
    • note
    • We have found that exposure of the iron complexes to halogenated solvents results in greatly exaggerated magnetic susceptibility values and greatly reduced activities. These observations are consistent with free-radical reactions leading to the formation of Fe(III) species and catalytically inactive impurities.
  • 70
    • 0345252647 scopus 로고    scopus 로고
    • note
    • -.
  • 71
    • 0001673737 scopus 로고    scopus 로고
    • For leading references relating to a variety of migratory insertion processes and polymerization systems, see: (a) Tempel, D. J.; Brookhart, M. Organometallics 1998, 17, 2290.
    • (1998) Organometallics , vol.17 , pp. 2290
    • Tempel, D.J.1    Brookhart, M.2
  • 88
    • 0345684207 scopus 로고    scopus 로고
    • note
    • 13C NMR chemical shift of 33.5 ppm.
  • 93
    • 0345252641 scopus 로고    scopus 로고
    • note
    • β-H transfer to the incoming monomer to generate a new Fe-alkyl species, or to the metal to form an Fe-H species, are both possible routes for chain transfer. If β-H transfer to monomer occurs, it must occur in a primary (1,2) fashion (opposite the regiochemistry observed for propagation) to generate an Fe-propyl complex.
  • 94
    • 0010077705 scopus 로고
    • 2AlCl will polymerize propylene at -78 °C in a 2,1 fashion to generate syndiotactic polypropylene. These systems are not highly regioregular, and the polymer chains apparently do not terminate via β-H elimination to give unsaturated end groups suitable for NMR analysis. For example, see: (a) Doi, Y. Macromolecules 1979, 12, 248.
    • (1979) Macromolecules , vol.12 , pp. 248
    • Doi, Y.1


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.