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URN to cite this document: urn:nbn:de:bvb:703-epub-9555-7
Title data
Stephan, Florian ; Thümmler, Justus Friedrich ; Binder, Wolfgang Hubertus ; Ruckdäschel, Holger:
Recycling-Induced Changes of Molecular Weight and Structural Properties in PET Monopolymer Blends.
In: Journal of Polymer Science.
Vol. 64
(2026)
Issue 11
.
- pp. 2398-2408.
ISSN 2642-4169
DOI der Verlagsversion: https://doi.org/10.1002/pol.20251151
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Project information
| Project title: |
Project's official title Project's id Maschinelles Lernen zur zielgerichteten Prozessführung beim Recycling von Polyestern mittels reaktiver Extrusion 518732456 Open Access Publizieren No information |
|---|---|
| Project financing: |
Deutsche Forschungsgemeinschaft |
Abstract
Mechanical recycling of plastics is the most common process, but mixed polymer chain lengths make molecular weight effects unclear. By blending high and low molecular weight (M w) Polyethylene terephthalate (PET), we want to investigate the changes in molecular weight distribution in the extrusion process and the properties regarding processability and performance. Bottle-grade PET (high M w) and fiber-grade PET (low M w) were used. The aim of the study was to understand the structure–property relationship relevant to mechanical recycling for PET. We focused on melt viscosity, degree of crystallinity, tensile strength, and elongation at break, all strongly dependent on molecular weight. Different blend ratios were extruded and tested for molecular weight, thermal, rheological, and mechanical behavior. The results show that blending enables precise tuning of properties. GPC and rheology confirm chain scission and extension during extrusion, leading to convergence of molecular weight distributions. Thermal analysis shows a reduced degree of crystallinity and melting temperature with higher M w. Mechanical tests reveal that higher M w improves tensile strength and elongation up to a threshold. All blends show similar molecular weight distribution, ensuring consistent properties and wider processing options for recycled PET.
Further data
| Item Type: | Article in a journal |
|---|---|
| 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 Profile Fields > Advanced Fields > Advanced Materials Faculties Faculties > Faculty of Engineering Science Faculties > Faculty of Engineering Science > Chair Polymer Materials Profile Fields Profile Fields > Advanced Fields |
| Language: | English |
| Originates at UBT: | Yes |
| URN: | urn:nbn:de:bvb:703-epub-9555-7 |
| Date Deposited: | 31 Jul 2026 11:39 |
| Last Modified: | 31 Jul 2026 11:40 |
| URI: | https://epub.uni-bayreuth.de/id/eprint/9555 |
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