1,720,994 research outputs found
Attrition of lignite char during fluidized bed gasification: experimental and modeling studies
No full textIsotactic Polymerization of Propene With Heterogeneous Catalytic-systems - A Partial Tentative Rationalization of the Behavior of Some 3rd Components
No full textThe stereoregulating effects of Me benzoate (I) [93-58-3] in TiCl4-MgCl2-Et3Al Ziegler catalysts for polymn. of C3H6 [115-07-1] could be attributed to slow ligand exchangers for the nonstereospecific sites and to the deactivation of the nonstereospecific sites in the presence of I. The carbon atoms of I (as a fourth component in the catalyst) were incorporated into the polymer via alkylation of I by the Ti-C bond of the active catalytic sites. The polymn. kinetics was discussed
'Conformational analysis and reactivity in isotactic specific polymerization of C-3 branched -olefins
No full textTrigonal bipyramidal platinum complexes as models for ziegler-natta catalytic sites
No full textFive-coordinated η2-adducts of (+)-(S)-3-methyl-1-pentene (SMP) and (R,S)-3-methyl-1-pentene (RSMP) of the type [PtCl2(η2-olefin)(α-di-hydrazone)] were prepared. In solution the more stable adducts are those which have the olefin presenting to Pt the face of opposite configuration to that of the chiral substituent. In the solid state the same situation is found by X-ray analysis for the adduct of SMP, while 1H NMR studies point to the conclusion that the same configuration as the chiral substituent is preferred in the solid adduct of RSMP. These observations are compared with those in previous reports on coordination of SMP on square planar Pt and stereoselective polymerization. © 1983
Polymerization of Vinyl Monomers With Achiral Titanocene Catalysts - From Like To Unlike 1,3 Asymmetric Induction
No full text
Ethylene-propene copolymerization in the presence of a 13C enriched catalyst: end group analysis and monomer reactivities in the first insertion steps
No full textC-13-enriched End Groups of Polypropylene and Poly(1-butene) Prepared In the Presence of Bis(cyclopentadienyl)titanium Diphenyl and Methylalumoxane
No full textMolecular-structure of Copolymers of Propene and [1-c-13] Ethylene Prepared In the Presence of Soluble Titanocene Methylalumoxane Catalysts
No full text- …
