Design of temperature resistant recycled PET/PBT bead foams and clarification of structure-property-relationships when foaming and welding.
Final Report Abstract
The project investigated the processing and properties of recycled polyethylene terephthalate (rPET) and polybutylene terephthalate (PBT) and their blends, particularly with regard to thermal behavior, crystallization, foam extrusion and weldability. Firstly, the thermal properties and crystallization of the blends were analyzed. It was found that rPET and PBT are miscible in the amorphous state but remain segregated in the crystalline phase, resulting in a characteristic double melting peak. The addition of a chain extender had little effect on crystallization, but significantly increased viscosity and melt strength. In foam extrusion, a CE concentration of 0.8 wt% was found to give optimum results in terms of cell structure and density, while higher concentrations limited processability. Welding tests using RF technology showed that the rPET50/PBT50 blends gave the best welding results as the double melting peak extended the process window. Finally, the reaction kinetics of the CE modification were investigated to better understand the rheological and foaming properties. The results of the project provide an important basis for the processing and application of rPET/PBT blends, especially in the field of sustainable foams.
Publications
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Investigation of the Reaction Kinetics of Poly(butylene terephthalate) and Epoxide Chain Extender. Macromolecular Materials and Engineering, 308(7).
Himmelsbach, Andreas; Standau, Tobias; Kuhnigk, Justus; Bubmann, Tobias; Akdevelioglu, Yavuz; Nofar, Mohammadreza & Ruckdäschel, Holger
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Melt Rheological and Bead Foaming Behavior of Recycled Polyethylene Terephthalate/Polybutylene Terephthalate Blends Modified with a Joncryl Chain Extender. Industrial & Engineering Chemistry Research, 63(14), 6222-6234.
Akdevelioğlu, Yavuz; Himmelsbach, Andreas; Ruckdäschel, Holger & Nofar, Mohammadreza
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Non‐isothermal crystallization kinetic of recycled PET and its blends with PBT modified with epoxy‐based multifunctional chain extender. Journal of Applied Polymer Science, 141(19).
Himmelsbach, Andreas; Brütting, Christian; Akdevelioglu, Yavuz; Albuquerque, Rodrigo Q.; Nofar, Mohammadreza & Ruckdäschel, Holger
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Reaction Kinetics of Recycled Polyethylene Terephthalate with PMDA Chain Extender Analyzed by a Microcompounder. ACS Sustainable Chemistry & Engineering, 12(10), 4194-4202.
Himmelsbach, Andreas; Gerschmann, Leo; Akdevelioğlu, Yavuz; Nofar, Mohammadreza & Ruckdäschel, Holger
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Improving rPET/PBT Bead Foam Structure via Chain Extender Modification and Blend Variance. Journal of Polymers and the Environment, 33(3), 1517-1527.
Himmelsbach, Andreas; Akdevelioglu, Yavuz; Nofar, Mohammadreza & Ruckdäschel, Holger
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Kinetic Analysis of PMDA-Induced Chain Extension in Polyester Blends: Differential Reactivity of rPET and PBT during Reactive Extrusion. Industrial & Engineering Chemistry Research, 64(5), 2553-2560.
Himmelsbach, Andreas; Gerschmann, Leo; Akdevelioğlu, Yavuz; Nofar, Mohammadreza & Ruckdäschel, Holger
