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Volumn 30, Issue 23, 1997, Pages 7056-7062

Polymer microstructure as a probe into hydrogen activation effect in ansa-zirconocene/methylaluminoxane catalyzed propene polymerizations

Author keywords

[No Author keywords available]

Indexed keywords

CATALYSTS; GEL PERMEATION CHROMATOGRAPHY; HYDROGEN; MICROSTRUCTURE; MOLECULAR WEIGHT; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; POLYMERIZATION; TOLUENE;

EID: 0031275617     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma970773g     Document Type: Article
Times cited : (76)

References (46)
  • 22
    • 3843050462 scopus 로고    scopus 로고
    • note
    • Molecular weights and polydispersities (GPC), however, were found to cover much narrower ranges, characteristic of each zirconocene, indicating that the variations in yield within a single set of reaction conditions (i.e., particular zirconocene with or without hydrogen) were due to variations in the amounts of actually active catalyst, and not to changes in the character of the reaction.
  • 24
    • 3843129868 scopus 로고    scopus 로고
    • unpublished results
    • (b) Forlini, F., unpublished results.
    • Forlini, F.1
  • 31
    • 3843061471 scopus 로고    scopus 로고
    • note
    • 10 Therefore, it may be that under our conditions the main factor governing the relative activities of V us VI, is simply an inverse relationship between activity and numbers of secondary insertions (Table 2). These same arguments may also explain the similar reversal of the relative activities of the pair of catalysts III and IV, on going from high monomer concentrations (refs 12 and 13) to our conditions of low concentration (Tables 1 and 2).
  • 34
    • 3843050463 scopus 로고    scopus 로고
    • note
    • 9
  • 37
    • 3843094074 scopus 로고    scopus 로고
    • note
    • 2 and monomer for Zr-1,2 and Zr-2,1 sites, and therefore the amount by which this reckoning underestimates the Zr-1,2 sites, would vary from one metallocene to another.
  • 38
    • 3843049341 scopus 로고    scopus 로고
    • note
    • The curves in Figure 1 were corrected for the rapid flow of propene into the reactor during equilibration of propene in solution in toluene (first 3-4 min) by subtracting from them the curve recorded for dissolution of propene in the absence of catalyst, under otherwise identical conditions.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.