Zeigler-Natta catalyst

Zeigler-Natta catalysts Zein coatings Zeisses salt Zelan... 

Similar stability and reactivity have also been observed for bridged-Cp systems. The catalyticaHy active (CH2)2Si(C (CH2)4)2ThR2, where R = Cl [89597-06-8] alkyl, CH2CgH [89597-10A] aryls, or H [89597-11-5], Similar to Group 4 transition-metal Zeigler-Natta catalysts, stable cationic Th(IV) species, eg, [Cp 2ThCH2] [108834-69-17, have been isolated with a host of noncoordinatiag/nonreactive anions. MetaHacycle formation has also been... 

J. Boor, Jr., Zeigler-Natta Catalysts andPolymeri tions, Academic Press, Inc., New York, 1979. 

To carry out this process ethylene gas is passed through a fluidised bed column that is filled with Zeigler-Natta catalyst... 

While it was possible to produce sPP, employing the Zeigler-Natta solid systems, commercial sPP has only recently become commercial through the use of the soluble metallocene catalysts. These materials have a similar Tg as iPP, but they have a different balance between stiffness and toughness. 

The polymerization of ethylene via the Zeigler-Natta process is extremely important commericially and serves as an excellent example of the role of the a-v rearrangement in catalysis (14). The catalyst in this... 

Volume 15 deals with those polymerization processes which do not involve free radicals as intermediates. Chapters 1 and 2 cover homogeneous anionic and cationic polymerization, respectively, and Chapter 3 polymerizations initiated by Zeigler-Natta and related organometallic catalysts. Chapters 4, 5 and 6 deal with the polymerization of cyclic ethers and sulphides, of aldehydes and of lactams, respectively. Finally, in Chapter 7 polycondensation reactions, and in Chapter 8 the polymerization of AT-carboxy-a-amino acid anhydrides, are discussed. 

In the thesis of a pofymer on a Zeigler-Natta catalyst, the molecule grows in the manner of a hair (Figure 1.4). The growth point is at the catafyst surface. The monomers diffuse through the solvent to the catalyst... 

For isotactic polymers and copolymers the behavior is complex and depends on the method of synthesis and the types of defects that result. For instance, isotactic polypropylene synthesized using Zeigler-Natta catalysts has a quite different defect content from the same polymer synthesized... 

Hakim, S. MobaUegh, L., Tailoring MWD of Bimodal Polyethylene in the Presence of Zeigler-Natta Catalyst. Macromol. Symp. 2011, 302,191-197. 

C-H Bond activation, with lanthanides Ethylene polymerization, with lanthanides Zeigler-Natta catalyst, lanthanide Diene polymerization, with lanthanides Olefin polymerization, with lanthanides Butadiene polymerization, with lanthanides Isoprene polymerization, with lanthanides Anionic propagation, at lanthanides Living polymers, at lanthanides Pseudo-living polymers, at lanthanides Reaction orders, diene polymerization Active sites, diene polymerization... 

Durham route to soluble Zeigler-Natta catalyst. 89... 

Amass and Stowell et al. replaced the Zeigler-Natta catalyst with a methathesis catalyst for the copolymerization of acetylene with various flexible components including cyclic alkene. The metathesis catalyst has a slower polymerization rate for acetylene and therefore better control of the acetylene segment length. In a series of three papers [67-69], the efficiency of the... 

LI Copolymerization with acetylene derivatives using a Zeigler-Natta catalyst... 

Catalyst, Ziegler-Natta Also called the Z-N catalyst. Karl Zeigler (1898-1973) of Germany and Giulio Natta (1903-1979) of Italy developed a catalyst for the industrial production of polyolefin plastics. Together they received the Nobel Prize for chemistry in 1963. They provided the key (Zeigler for PE Natta for PP) at that time to a relatively simple. 

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