| CORP. SALE | Their structures in the solid state as well as in soln are characterized by specific combinations of intact & rearranged ylide ligands |
| OBSERVATION'S |
Title catalysts are documented in more than 30 patents & scientific publications. The catalytic features of these well-defined organometallic species with highly polar, energy-rich ligands are extraordinary when compared with classical Ziegler-Natta & metallocene catalysts. They show high activity in ethylene polymn even without any cocatalyst. Their turnover numbers per hour are 100000 mol/mol Ni or 1 million g/mol Ni. The kinetically determined max polymn rates are much higher MW of the polyethylenes can be fully controlled through the specific choice of the ligands from low to ultrahigh MW (that is, 1000-10.000.000 g/mol Ni). The ligand structure selectively controls the formation of linear or branched prodts (short-chain branches) in ethylene homo- polymn.; that is, without using any comonomers. End-functionalized polyethylenes have been obtained with styrene, divinylbenzene, & related polar monomers. Bis(ylide) catalysts effectively tolerate polar functionalities (that is, all kinds of polar solvents & polar polymer soln., including PVA). They also polymerize polar monomers. |
| UPDATE | 04.00 |
| USES | The tailoring potential & polar group tolerances of bis(ylide) catalysts have led to highly sophisticated advanced materials, novel high-efficiency broadband light polarizers for LCD & easily processible & highly stable chi(3) materials for nonlinear optical devices |
| AUTHOR | This data is not available for free |
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