The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
Franc Meyer - One of the best experts on this subject based on the ideXlab platform.
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highly active and readily accessible proline based dizinc catalyst for co2 epoxide copolymerization
Chemistry: A European Journal, 2017Co-Authors: Mike Schutze, Sebastian Dechert, Franc MeyerAbstract:In the pursuit of CO2-based materials, the development of efficient catalysts for the alternating copolymerization of CO2 and epoxides to give Polycarbonates is receiving particular attention. Desirable attributes for such catalysts are high copolymerization activity at low CO2 pressure, as well as chemo- and stereocontrol over the formed polymer. Here we report a novel chiral zinc catalyst that can be isolated in 97 % yield from commercial sources, and that produces Polycarbonates selectively from neat cyclohexene oxide under 1 bar of CO2 pressure at temperatures above 50 °C. At 80 °C reaction temperature, TONs of 1684 and initial TOFs up to 149 h-1 were measured, producing an isotactic-enriched Polycarbonate with a probability Pm of 65 % for the formation of a meso diad. Insight into the dinuclear nature of the active species and the copolymerization progress has been gained from structural and spectroscopic studies.
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Highly Active and Readily Accessible Proline‐Based Dizinc Catalyst for CO2/Epoxide Copolymerization
Chemistry: A European Journal, 2017Co-Authors: Mike Schutze, Sebastian Dechert, Franc MeyerAbstract:In the pursuit of CO2-based materials, the development of efficient catalysts for the alternating copolymerization of CO2 and epoxides to give Polycarbonates is receiving particular attention. Desirable attributes for such catalysts are high copolymerization activity at low CO2 pressure, as well as chemo- and stereocontrol over the formed polymer. Here we report a novel chiral zinc catalyst that can be isolated in 97 % yield from commercial sources, and that produces Polycarbonates selectively from neat cyclohexene oxide under 1 bar of CO2 pressure at temperatures above 50 °C. At 80 °C reaction temperature, TONs of 1684 and initial TOFs up to 149 h-1 were measured, producing an isotactic-enriched Polycarbonate with a probability Pm of 65 % for the formation of a meso diad. Insight into the dinuclear nature of the active species and the copolymerization progress has been gained from structural and spectroscopic studies.
Mike Schutze - One of the best experts on this subject based on the ideXlab platform.
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highly active and readily accessible proline based dizinc catalyst for co2 epoxide copolymerization
Chemistry: A European Journal, 2017Co-Authors: Mike Schutze, Sebastian Dechert, Franc MeyerAbstract:In the pursuit of CO2-based materials, the development of efficient catalysts for the alternating copolymerization of CO2 and epoxides to give Polycarbonates is receiving particular attention. Desirable attributes for such catalysts are high copolymerization activity at low CO2 pressure, as well as chemo- and stereocontrol over the formed polymer. Here we report a novel chiral zinc catalyst that can be isolated in 97 % yield from commercial sources, and that produces Polycarbonates selectively from neat cyclohexene oxide under 1 bar of CO2 pressure at temperatures above 50 °C. At 80 °C reaction temperature, TONs of 1684 and initial TOFs up to 149 h-1 were measured, producing an isotactic-enriched Polycarbonate with a probability Pm of 65 % for the formation of a meso diad. Insight into the dinuclear nature of the active species and the copolymerization progress has been gained from structural and spectroscopic studies.
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Highly Active and Readily Accessible Proline‐Based Dizinc Catalyst for CO2/Epoxide Copolymerization
Chemistry: A European Journal, 2017Co-Authors: Mike Schutze, Sebastian Dechert, Franc MeyerAbstract:In the pursuit of CO2-based materials, the development of efficient catalysts for the alternating copolymerization of CO2 and epoxides to give Polycarbonates is receiving particular attention. Desirable attributes for such catalysts are high copolymerization activity at low CO2 pressure, as well as chemo- and stereocontrol over the formed polymer. Here we report a novel chiral zinc catalyst that can be isolated in 97 % yield from commercial sources, and that produces Polycarbonates selectively from neat cyclohexene oxide under 1 bar of CO2 pressure at temperatures above 50 °C. At 80 °C reaction temperature, TONs of 1684 and initial TOFs up to 149 h-1 were measured, producing an isotactic-enriched Polycarbonate with a probability Pm of 65 % for the formation of a meso diad. Insight into the dinuclear nature of the active species and the copolymerization progress has been gained from structural and spectroscopic studies.
Y K Vijay - One of the best experts on this subject based on the ideXlab platform.
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Junction characteristics of C60/Polycarbonate blend on Si substrate
Applied Surface Science, 2009Co-Authors: S S Sharma, B. Tripathi, Deepak Bhatnagar, M. Singh, Y K VijayAbstract:We report a study of the interface between fullerene (C60) doped Polycarbonate (PC) blends and n-type Si substrate. C60is usually an electron acceptor in interpenetrated networks and an electron transport in photovoltaic cells. We have studied that the guest-host approach to prepare C60doped Polycarbonate blend. In this article, we report the I-V characteristics of C60doped Polycarbonate/n-type Si junction and the annealing effect on these characteristics. In this junction, a nanocomposite of organic semiconductor fullerene (C60), used as the active medium, with an inert Polycarbonate matrix was spin coated on n-type Si substrate. We found that the C60shows the junction characteristics with n-type Si substrate. The knee voltage and dynamic resistance varies with concentration of C60as well as temperature. Ellipsometry studies showed the annealing effect on the refractive index and thickness of C60doped Polycarbonate blend on n-type Si substrate. The optical micrographs show that fullerene (C60) is spherical molecule and it is blend in the form of crystallites having size of micron order. © 2009 Elsevier B.V. All rights reserved.
Sebastian Dechert - One of the best experts on this subject based on the ideXlab platform.
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highly active and readily accessible proline based dizinc catalyst for co2 epoxide copolymerization
Chemistry: A European Journal, 2017Co-Authors: Mike Schutze, Sebastian Dechert, Franc MeyerAbstract:In the pursuit of CO2-based materials, the development of efficient catalysts for the alternating copolymerization of CO2 and epoxides to give Polycarbonates is receiving particular attention. Desirable attributes for such catalysts are high copolymerization activity at low CO2 pressure, as well as chemo- and stereocontrol over the formed polymer. Here we report a novel chiral zinc catalyst that can be isolated in 97 % yield from commercial sources, and that produces Polycarbonates selectively from neat cyclohexene oxide under 1 bar of CO2 pressure at temperatures above 50 °C. At 80 °C reaction temperature, TONs of 1684 and initial TOFs up to 149 h-1 were measured, producing an isotactic-enriched Polycarbonate with a probability Pm of 65 % for the formation of a meso diad. Insight into the dinuclear nature of the active species and the copolymerization progress has been gained from structural and spectroscopic studies.
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Highly Active and Readily Accessible Proline‐Based Dizinc Catalyst for CO2/Epoxide Copolymerization
Chemistry: A European Journal, 2017Co-Authors: Mike Schutze, Sebastian Dechert, Franc MeyerAbstract:In the pursuit of CO2-based materials, the development of efficient catalysts for the alternating copolymerization of CO2 and epoxides to give Polycarbonates is receiving particular attention. Desirable attributes for such catalysts are high copolymerization activity at low CO2 pressure, as well as chemo- and stereocontrol over the formed polymer. Here we report a novel chiral zinc catalyst that can be isolated in 97 % yield from commercial sources, and that produces Polycarbonates selectively from neat cyclohexene oxide under 1 bar of CO2 pressure at temperatures above 50 °C. At 80 °C reaction temperature, TONs of 1684 and initial TOFs up to 149 h-1 were measured, producing an isotactic-enriched Polycarbonate with a probability Pm of 65 % for the formation of a meso diad. Insight into the dinuclear nature of the active species and the copolymerization progress has been gained from structural and spectroscopic studies.
S S Sharma - One of the best experts on this subject based on the ideXlab platform.
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Junction characteristics of C60/Polycarbonate blend on Si substrate
Applied Surface Science, 2009Co-Authors: S S Sharma, B. Tripathi, Deepak Bhatnagar, M. Singh, Y K VijayAbstract:We report a study of the interface between fullerene (C60) doped Polycarbonate (PC) blends and n-type Si substrate. C60is usually an electron acceptor in interpenetrated networks and an electron transport in photovoltaic cells. We have studied that the guest-host approach to prepare C60doped Polycarbonate blend. In this article, we report the I-V characteristics of C60doped Polycarbonate/n-type Si junction and the annealing effect on these characteristics. In this junction, a nanocomposite of organic semiconductor fullerene (C60), used as the active medium, with an inert Polycarbonate matrix was spin coated on n-type Si substrate. We found that the C60shows the junction characteristics with n-type Si substrate. The knee voltage and dynamic resistance varies with concentration of C60as well as temperature. Ellipsometry studies showed the annealing effect on the refractive index and thickness of C60doped Polycarbonate blend on n-type Si substrate. The optical micrographs show that fullerene (C60) is spherical molecule and it is blend in the form of crystallites having size of micron order. © 2009 Elsevier B.V. All rights reserved.
