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2-Ethylhexanoic Acid

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R. Jérôme – One of the best experts on this subject based on the ideXlab platform.

  • Single-step reactive extrusion of PLLA in a corotating twin-screw extruder promoted by 2-Ethylhexanoic Acid tin(II) salt and triphenylphosphine
    Polymer, 2000
    Co-Authors: S Jacobsen, H.-g. Fritz, Ph Degée, Ph Dubois, R. Jérôme
    Abstract:

    The ring opening polymerisation of L,L-lactide using an equimolar complex of 2-Ethylhexanoic Acid tin(II) salt Sn(Oct)2 and triphenylphosphine P(φ)3 as catalyst shows for the first time a reactivity providing a polymerisation propagation rate fast enough to imagine a continuous single- step reactive extrusion process for bulk polymerisation. The ring opening polymerisation has been realised on a corotating closely intermeshing twin- screw extruder, using a specially designed screw concept to provide sufficient energy input and mixing for further enhancement of the propagation rate, without detrimentally enhancing depolymerisation or transesterification reactions. Using one chosen screw and processing concept on a twin-screw extruder with 25 mm diameter and a L/D-ratio of 48, the influence of different processing parameters on the resulting molecular parameters of the Polylactide (PLA) has been determined. Furthermore, the mechanical property profile of the generated PLA-polymers is discussed and related to the molecular parameters.

Ph Degée – One of the best experts on this subject based on the ideXlab platform.

  • Single-step reactive extrusion of PLLA in a corotating twin-screw extruder promoted by 2-Ethylhexanoic Acid tin(II) salt and triphenylphosphine
    Polymer, 2000
    Co-Authors: S Jacobsen, H.-g. Fritz, Ph Degée, Ph Dubois, R. Jérôme
    Abstract:

    The ring opening polymerisation of L,L-lactide using an equimolar complex of 2-Ethylhexanoic Acid tin(II) salt Sn(Oct)2 and triphenylphosphine P(φ)3 as catalyst shows for the first time a reactivity providing a polymerisation propagation rate fast enough to imagine a continuous single- step reactive extrusion process for bulk polymerisation. The ring opening polymerisation has been realised on a corotating closely intermeshing twin- screw extruder, using a specially designed screw concept to provide sufficient energy input and mixing for further enhancement of the propagation rate, without detrimentally enhancing depolymerisation or transesterification reactions. Using one chosen screw and processing concept on a twin-screw extruder with 25 mm diameter and a L/D-ratio of 48, the influence of different processing parameters on the resulting molecular parameters of the Polylactide (PLA) has been determined. Furthermore, the mechanical property profile of the generated PLA-polymers is discussed and related to the molecular parameters.

  • Beneficial effect of triphenylphosphine on the bulk polymerization of L,L‐lactide promoted by 2‐ethylhexanoic Acid tin (II) salt
    Journal of Polymer Science Part A: Polymer Chemistry, 1999
    Co-Authors: Ph Degée, H.-g. Fritz, Philippe Dubois, Sven Jacobsen, Robert Jérôme
    Abstract:

    The ring-opening polymerization of L,L-lactide has been studied in bulk using 2-Ethylhexanoic Acid tin (II) salt, Sn(Oct)2, as a catalyst over a wide range of temperature and monomer to Sn(Oct)2 molar ratio. Although Sn(Oct)2 was known to initiate a fast polymerization, it is reported now that some Lewis bases, particularly triphenylphosphine (P(ϕ)3), can increase further the polymerization rate, without any detrimental effect on the polylactide thermal stability. In order to optimize the balance between propagation and competing depolymerization reactions, the experimental conditions, i.e., temperature and concentration of Sn(Oct)2 and P(ϕ)3 have been optimized. The up-scaling of the laboratory experiments to reactive extrusion has proved to be feasible, which demonstrates the efficiency of this catalytic system to produce polylactide in a continuous one-stage polymerization process. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 2413–2420, 1999

H.-g. Fritz – One of the best experts on this subject based on the ideXlab platform.

  • Single-step reactive extrusion of PLLA in a corotating twin-screw extruder promoted by 2-Ethylhexanoic Acid tin(II) salt and triphenylphosphine
    Polymer, 2000
    Co-Authors: S Jacobsen, H.-g. Fritz, Ph Degée, Ph Dubois, R. Jérôme
    Abstract:

    The ring opening polymerisation of L,L-lactide using an equimolar complex of 2-Ethylhexanoic Acid tin(II) salt Sn(Oct)2 and triphenylphosphine P(φ)3 as catalyst shows for the first time a reactivity providing a polymerisation propagation rate fast enough to imagine a continuous single- step reactive extrusion process for bulk polymerisation. The ring opening polymerisation has been realised on a corotating closely intermeshing twin- screw extruder, using a specially designed screw concept to provide sufficient energy input and mixing for further enhancement of the propagation rate, without detrimentally enhancing depolymerisation or transesterification reactions. Using one chosen screw and processing concept on a twin-screw extruder with 25 mm diameter and a L/D-ratio of 48, the influence of different processing parameters on the resulting molecular parameters of the Polylactide (PLA) has been determined. Furthermore, the mechanical property profile of the generated PLA-polymers is discussed and related to the molecular parameters.

  • Beneficial effect of triphenylphosphine on the bulk polymerization of L,L‐lactide promoted by 2‐ethylhexanoic Acid tin (II) salt
    Journal of Polymer Science Part A: Polymer Chemistry, 1999
    Co-Authors: Ph Degée, H.-g. Fritz, Philippe Dubois, Sven Jacobsen, Robert Jérôme
    Abstract:

    The ring-opening polymerization of L,L-lactide has been studied in bulk using 2-Ethylhexanoic Acid tin (II) salt, Sn(Oct)2, as a catalyst over a wide range of temperature and monomer to Sn(Oct)2 molar ratio. Although Sn(Oct)2 was known to initiate a fast polymerization, it is reported now that some Lewis bases, particularly triphenylphosphine (P(ϕ)3), can increase further the polymerization rate, without any detrimental effect on the polylactide thermal stability. In order to optimize the balance between propagation and competing depolymerization reactions, the experimental conditions, i.e., temperature and concentration of Sn(Oct)2 and P(ϕ)3 have been optimized. The up-scaling of the laboratory experiments to reactive extrusion has proved to be feasible, which demonstrates the efficiency of this catalytic system to produce polylactide in a continuous one-stage polymerization process. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 2413–2420, 1999