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URN to cite this document: urn:nbn:de:bvb:703-epub-7127-3
Title data
Kuhnigk, Justus ; Krebs, Niko ; Standau, Tobias ; Dippold, Marcel ; Ruckdäschel, Holger:
Evaluation of the Fusion Quality of Bead Foams Made from Polybutylene Terephthalate (E-PBT) Depending on the Processing Temperature.
In: Macromolecular Materials and Engineering.
Vol. 307
(2022)
Issue 11
.
- No. 2200419.
ISSN 1439-2054
DOI der Verlagsversion: https://doi.org/10.1002/mame.202200419
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Project information
| Project financing: |
Deutsche Forschungsgemeinschaft |
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Abstract
Abstract Increasing requirements are leading to new developments in bead foam materials. Engineering thermoplastics such as polybutylene terephthalate (PBT) outperform standard bead foams in thermal stability. In order to obtain molded parts, beads are fused together using steam chest molding. Classical theories for the fusion mechanism, explaining the molding of amorphous EPS (expandable polystyrene) or semi-crystalline EPP (expanded polypropylene), cannot be applied to E-PBT (expanded polybutylene terephthalate). In previous studies, sufficient time for polymer interdiffusion during molding is identified as crucial and requires adjusted crystallization kinetics. This study consequently examines to which extent the crystalline properties and the bead fusion behavior of E-PBT can be influenced by the bead foaming process. By varying the underwater granulation (UWG) water temperature, different cooling rates of the expanding melt are generated. The foamed beads show different cell morphologies, thermal and dynamic mechanical properties depending on the UWG water temperature. Those beads that show a pronounced shrinkage behavior in the thermomechanical analysis, caused by an increased open cell content and a pronounced cold-crystallization, exhibit a reduced bead fusion quality. The bead fusion quality is examined by the fracture surface. The shrinkage phenomenon causes a reduced bead to bead contact and partially separation between the beads.
Further data
| Item Type: | Article in a journal |
|---|---|
| Keywords: | bead foam; bead fusion; bending test; chemical modification; polybutylene terephthalate |
| DDC Subjects: | 600 Technology, medicine, applied sciences > 620 Engineering |
| Institutions of the University: | Faculties > Faculty of Engineering Science > Chair Polymer Materials > Chair Polymer Materials - Univ.-Prof. Dr.-Ing. Holger Ruckdäschel Faculties Faculties > Faculty of Engineering Science Faculties > Faculty of Engineering Science > Chair Polymer Materials |
| Language: | English |
| Originates at UBT: | Yes |
| URN: | urn:nbn:de:bvb:703-epub-7127-3 |
| Date Deposited: | 19 Jul 2023 09:04 |
| Last Modified: | 19 Jul 2023 09:05 |
| URI: | https://epub.uni-bayreuth.de/id/eprint/7127 |
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