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Insights into the Bead Fusion Mechanism of Expanded Polybutylene Terephthalate (E-PBT)

Title data

Kuhnigk, Justus ; Raps, Daniel ; Standau, Tobias ; Luik, Marius ; Altstädt, Volker ; Ruckdäschel, Holger:
Insights into the Bead Fusion Mechanism of Expanded Polybutylene Terephthalate (E-PBT).
In: Polymers. Vol. 13 (15 February 2021) Issue 4 . - p. 582.
ISSN 2073-4360
DOI: https://doi.org/10.3390/polym13040582

Abstract in another language

Expandable polystyrene (EPS) and expanded polypropylene (EPP) dominate the bead foam market. As the low thermal performance of EPS and EPP limits application at elevated temperatures novel solutions such as expanded polybutylene terephthalate (E-PBT) are gaining importance. To produce parts, individual beads are typically molded by hot steam. While molding of EPP is well-understood and related to two distinct melting temperatures, the mechanisms of E-PBT are different. E-PBT shows only one melting peak and can surprisingly only be molded when adding chain extender (CE). This publication therefore aims to understand the impact of thermal properties of E-PBT on its molding behavior. Detailed differential scanning calorimetry was performed on neat and chain extended E-PBT. The crystallinity of the outer layer and center of the bead was similar. Thus, a former hypothesis that a completely amorphous bead layer enables molding, was discarded. However, the incorporation of CE remarkably reduces the crystallization and re-crystallization rate. As a consequence, the time available for interdiffusion of chains across neighboring beads increases and facilitates crystallization across the bead interface. For E-PBT bead foams, it is concluded that sufficient time for polymer interdiffusion during molding is crucial and requires adjusted crystallization kinetics.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: bead foam; fusion mechanism; crystallization; expanded polybutylene terephthalate; E-PBT; crystallization kinetics; Avrami; steam chest molding; chain extender; fusion
Institutions of the University: Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Former Professors
Faculties > Faculty of Engineering Science > Chair Polymer Materials
Faculties > Faculty of Engineering Science > Former Professors > Chair Polymer Materials - Univ.-Prof. Dr.-Ing. Volker Altstädt
Faculties > Faculty of Engineering Science > Chair Polymer Materials > Chair Polymer Materials - Univ.-Prof. Dr.-Ing. Holger Ruckdäschel
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Institute of Macromolecular Research - BIMF
Research Institutions > Affiliated Institutes
Research Institutions > Affiliated Institutes > Bavarian Polymer Institute (BPI)
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences
600 Technology, medicine, applied sciences > 620 Engineering
600 Technology, medicine, applied sciences > 660 Chemical engineering
Date Deposited: 18 May 2021 11:59
Last Modified: 18 May 2021 12:18
URI: https://eref.uni-bayreuth.de/id/eprint/65245