Modeling intraparticle transports during propylene polymerizations using supported metallocene and dual function metallocene as catalysts: Single particle model [PDF]
, 2014 Two improved multigrain models (MGMs) for preparing homopolypropylene and long chain branched polypropylene via propylene polymerization using silica-supported metallocene or dual function metallocene as catalysts are presented in this paper ...
Che, Liming +4 more
core +1 more source
Simple Method for the Preparation of Composites Based on PA6 and Partially Exfoliated Graphite [PDF]
, 2012 In the present work, the preparation of composite systems based on polyamide 6 (PA6) and exfoliated graphite was attempted by applying a simple procedure, which consists of a preliminary dispersion/exfoliation of graphite in the monomer, namely, ε ...
Bocchini, Sergio +5 more
core +3 more sources
Structure of a Permethylcyclopentadienyl-μ-tetramethylcyclopentadienylmethylene Scandium Dimer [PDF]
, 1992 Bis(η^5-pentamethylcyclopentadienyl)-bis[μ-2,3,4,5-tetramethyl-1-methylene-ScC^1:Sc'(η^5)-cyclopentadienyl]-discandium(III), [Sc_2(C_(10)H_(15))_2-(C_(10)H_(14)_2], M_r = 628.90, triclinic, Pl, ɑ = 8.641 (5), b= 9.478 (2), c = 12.338 (5) Å, ɑ = 75.58 (3),
Bercaw, John E. +2 more
core +1 more source
Determination of Optimal Reaction Temperature and Hydrogen Amount for Propylene Polymerization by a Mathematical Model [PDF]
Kemija u Industriji, 2019 Regarding the complexity of Ziegler-Natta catalyst kinetics in polypropylene polymerization, so far, there is no adequate model to determine the best process conditions for predicting average molecular weight and dispersity as the most crucial final ...
Gholam Hossain Varshouee +3 more
doaj +1 more source
A Silicon-Bridged Bis(substituted Cp) Yttrium Complex [PDF]
, 1992 rac-Bis(tetrahydrofuran)lithium [bis(2-trimethylsilyl-4-tert-butyl-η^5-cyclopentadienyl)dimethylsilane] dichloroyttrate, [Li(C_4H_80)_2][Y(C_(26)H_(48)-Si_3)Cl_2], M_r= 755.87, triclinic, Pl, ɑ = 13.110 (8), b = 17.163 (15), c = 20.623 (14) Å, ɑ= 104.02 (
Bercaw, John E. +3 more
core +1 more source
Copolymerization Studies of Vinyl Chloride and Vinyl Acetate with Ethylene Using a Transition-Metal Catalyst [PDF]
, 2002 Since the advent of Ziegler−Natta polymerization of ethylene, attempts have been made to extend coordination polymerization to commercially important monomers with polar functionality. In this study we examined the copolymerization of perdeuterated vinyl
Athey, Phillip S. +5 more
core +1 more source
POLYMERIZATION OF STYRENE USING ZIEGLER – NATTA CATALYST TYPE TICL4/MGCL2 – EB /ALET3 [PDF]
مجلة جامعة الانبار للعلوم الصرفة, 2013 In this study Ziegler – Natta catalyst was prepared which is a multi component catalytic system composed of, titaniumtetrachloride (TiCl4) as a active material, anhydrous magnesium chloride MgCl2 as support (carrier) which distribute the active material,
AYAD A. UTTAR, ALI S. ABED
doaj +1 more source
In situ stabilization of polypropylene by lignin using a Ziegler-Natta catalyst [PDF]
Polyolefins Journal, 2014 A fourth-generation Ziegler-Natta catalyst was prepared to synthesize polypropylene (PP), which was stabilized by in situpolymerization employing lignin as antioxidant.
Maria Marques +3 more
doaj +1 more source
Angewandte Chemie International Edition, EarlyView.Titanium silicalite‐1 (TS‐1), used in industrial selective oxidation processes, depends on specific, yet still unresolved Ti sites, dispersed within the framework of an MFI‐zeolite. Applying high field (28.2 T) 47/49Ti NMR and 17O NMR spectroscopy for an array of TS‐1 catalysts enables the development of an NMR crystallography protocol and the ...
Christoph J. Kaul +14 more
wiley +1 more source
Process Modeling for Propylene Polymerization to Transfer Reaction Kinetics From Lab to Plant
Chemie Ingenieur Technik, EarlyView.The modeling approach combines an industrial model for a fourth‐generation Ziegler–Natta catalyst with lab‐scale derived kinetics of a novel fifth‐generation catalyst. By transferring intrinsic kinetics across scales, polypropylene production can be predicted. Accurate melt flow rate prediction is only obtained with an additional adjustment.
Anna Konopka +5 more
wiley +1 more source