The Experts below are selected from a list of 747 Experts worldwide ranked by ideXlab platform

Peter C. Thüne - One of the best experts on this subject based on the ideXlab platform.

  • introducing a flat model of the silica supported bis imino pyridyl iron ii Polyolefin Catalyst
    Macromolecular Rapid Communications, 2006
    Co-Authors: Christian Muller, Dieter Vogt, J Hans W Niemantsverdriet, Peter C. Thüne
    Abstract:

    Summary: A well-defined flat model of a supported homogeneous Polyolefin Catalyst is prepared on the basis of an immobilized bis(imino)pyridyl iron complex on a super flat silica surface. The amount of supported Catalyst precursor is quantified using XPS. This model Catalyst remains active over extended periods, i.e., an average activity of 0.25 × 103 kg PE · (molCat · h · bar)-1 is obtained for 24 h of ethylene polymerization. The morphology of the nascent polyethylene film is investigated by SEM.

Christian Muller - One of the best experts on this subject based on the ideXlab platform.

  • introducing a flat model of the silica supported bis imino pyridyl iron ii Polyolefin Catalyst
    Macromolecular Rapid Communications, 2006
    Co-Authors: Christian Muller, Dieter Vogt, J Hans W Niemantsverdriet, Peter C. Thüne
    Abstract:

    Summary: A well-defined flat model of a supported homogeneous Polyolefin Catalyst is prepared on the basis of an immobilized bis(imino)pyridyl iron complex on a super flat silica surface. The amount of supported Catalyst precursor is quantified using XPS. This model Catalyst remains active over extended periods, i.e., an average activity of 0.25 × 103 kg PE · (molCat · h · bar)-1 is obtained for 24 h of ethylene polymerization. The morphology of the nascent polyethylene film is investigated by SEM.

Dieter Vogt - One of the best experts on this subject based on the ideXlab platform.

  • introducing a flat model of the silica supported bis imino pyridyl iron ii Polyolefin Catalyst
    Macromolecular Rapid Communications, 2006
    Co-Authors: Christian Muller, Dieter Vogt, J Hans W Niemantsverdriet, Peter C. Thüne
    Abstract:

    Summary: A well-defined flat model of a supported homogeneous Polyolefin Catalyst is prepared on the basis of an immobilized bis(imino)pyridyl iron complex on a super flat silica surface. The amount of supported Catalyst precursor is quantified using XPS. This model Catalyst remains active over extended periods, i.e., an average activity of 0.25 × 103 kg PE · (molCat · h · bar)-1 is obtained for 24 h of ethylene polymerization. The morphology of the nascent polyethylene film is investigated by SEM.

J Hans W Niemantsverdriet - One of the best experts on this subject based on the ideXlab platform.

  • introducing a flat model of the silica supported bis imino pyridyl iron ii Polyolefin Catalyst
    Macromolecular Rapid Communications, 2006
    Co-Authors: Christian Muller, Dieter Vogt, J Hans W Niemantsverdriet, Peter C. Thüne
    Abstract:

    Summary: A well-defined flat model of a supported homogeneous Polyolefin Catalyst is prepared on the basis of an immobilized bis(imino)pyridyl iron complex on a super flat silica surface. The amount of supported Catalyst precursor is quantified using XPS. This model Catalyst remains active over extended periods, i.e., an average activity of 0.25 × 103 kg PE · (molCat · h · bar)-1 is obtained for 24 h of ethylene polymerization. The morphology of the nascent polyethylene film is investigated by SEM.

Darrek Mort - One of the best experts on this subject based on the ideXlab platform.

  • Preparation of New Olefin Polymerization PreCatalysts by Facile Derivatization of Imino–Enamido ZrMe3 and HfMe3 Complexes
    2013
    Co-Authors: Jerzy Klosin, Philip P. Fontaine, Ruth Figueroa, Scott D. Mccann, Darrek Mort
    Abstract:

    A novel strategy for Polyolefin Catalyst development was explored, in which imino–enamido zirconium and hafnium trimethyl complexes were used as synthons to produce a diverse array of new dimethyl derivatives. Specifically, reactions of the trimethyl precursors with protic reagents (i.e., imidazolimines, phosphinimines, and phenols) or unsaturated organic reagents (i.e., diisopropyl ketone and diisopropylcarbodiimide) resulted in the formation of new complexes wherein a single methyl group is replaced by a heteroatom-based ligand. In total, ten new dimethyl complexes were prepared and isolated in high yields utilizing these synthetic approaches. The new complexes were evaluated as preCatalysts in ethylene/1-octene copolymerization reactions at 120 °C. Seven complexes were found to be competent Catalysts under these conditions, and the resulting copolymers comprised a wide range of molecular weights and octene contents. The best Catalysts of the series comprised imino–enamido complexes containing a phosphine-imidato ligand, which exhibited remarkably high activities, had high ethylene selectivities, and produced ethylene/1-octene copolymers with exceptionally high molecular weights. This work demonstrates that the replacement of one of the alkyl groups from trialkyl complexes can be a very effective approach for accessing a variety of new dialkyl preCatalysts that can exhibit diverse polymerization behavior