31 research outputs found
Dialkyl and Methyl-Alkyl Zirconocenes: Synthesis and Characterization of Zirconocene-Alkyls That Model the Polymeryl Chain in Alkene Polymerizations
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Zirconium and Titanium Propylene Polymerization Precatalysts Supported by a Fluxional C
Full text linkRheology and melt fracture of poly(lactides)
Get PDFThe wall slip and melt fracture behaviour of several commercial polylactides (PLAs) have been investigated. PLAs with molecular weights greater than a certain value were found to slip, with the slip velocity to increase with decrease of molecular weight. The onset of melt fracture for the high molecular weight PLAs was found to occur at around 0.2 to 0.3 MPa, depending on the geometrical characteristics of the dies. Addition of 0.5wt% of a poly(e-caprolactone) (PCL) into the PLA that exhibits melt fracture was found to be effective in eliminating and delaying the onset of melt fracture to higher shear rates
Discussion of paper by L.-E. Chile, P. Mehrkhodavandi, and S. G. Hatzikiriakos, entitled ‘Aromatic interactions in aryl-capped polylactides: A thermorheological investigation’
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Goldilocks Effect of a Distal Substituent on Living Ziegler-Natta Polymerization Activity and Stereoselectivity within a Class of Zirconium Amidinate-Based Initiators
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Cationic Hafnium Alkyl Complexes that Are Stable toward β-Hydride Elimination below 10 °C and Active as Initiators for the Living Polymerization of 1-Hexene
No full textMetallocene systems in propylene polymerization: Effect of triisobutylaluminum and lewis bases on the behavior of catalysts and properties of polymers
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