---
_id: '65049'
abstract:
- lang: eng
  text: <jats:p>The degradation of polypropylene (PP) through thermal and mechanical
    stress, as well as the influence of oxygen, are unavoidable when processing on
    a co-rotating twin-screw extruder. In previous studies, a mathematical model was
    developed to predict the degradation while compounding on different twin-screw
    extruder sizes. Additionally, the examination of filled PPs was conducted. To
    this end, a range of operating parameters and extruder sizes were used to process
    PP, and the molar mass was then determined by melt flow rate (MFR) and gel permeation
    chromatography (GPC) measurements to derive the degree of degradation. The model
    was then modified by adjusting the sensitivity parameters to allow the degradation
    behavior of the PPs to be described independently of extruder size. Consistent
    with prior research, comprehensive measurements of a PP/titanium dioxide (TiO2)
    compound revealed that, with a few exceptions, increasing temperatures and screw
    speeds and decreasing throughputs generally resulted in higher degradation. However,
    the application of the model to the compounds did not achieve good agreement with
    the measured degradation, indicating different degradation conditions due to the
    different thermodynamic and rheological properties of the compounds.</jats:p>
article_number: '1509'
author:
- first_name: Paul
  full_name: Albrecht, Paul
  id: '90467'
  last_name: Albrecht
- first_name: Matthias
  full_name: Altepeter, Matthias
  last_name: Altepeter
- first_name: Florian
  full_name: Brüning, Florian
  id: '72920'
  last_name: Brüning
citation:
  ama: Albrecht P, Altepeter M, Brüning F. Degradation of Polypropylene and Polypropylene
    Compounds on Co-Rotating Twin-Screw Extruders. <i>Polymers</i>. 2025;17(11). doi:<a
    href="https://doi.org/10.3390/polym17111509">10.3390/polym17111509</a>
  apa: Albrecht, P., Altepeter, M., &#38; Brüning, F. (2025). Degradation of Polypropylene
    and Polypropylene Compounds on Co-Rotating Twin-Screw Extruders. <i>Polymers</i>,
    <i>17</i>(11), Article 1509. <a href="https://doi.org/10.3390/polym17111509">https://doi.org/10.3390/polym17111509</a>
  bibtex: '@article{Albrecht_Altepeter_Brüning_2025, title={Degradation of Polypropylene
    and Polypropylene Compounds on Co-Rotating Twin-Screw Extruders}, volume={17},
    DOI={<a href="https://doi.org/10.3390/polym17111509">10.3390/polym17111509</a>},
    number={111509}, journal={Polymers}, publisher={MDPI AG}, author={Albrecht, Paul
    and Altepeter, Matthias and Brüning, Florian}, year={2025} }'
  chicago: Albrecht, Paul, Matthias Altepeter, and Florian Brüning. “Degradation of
    Polypropylene and Polypropylene Compounds on Co-Rotating Twin-Screw Extruders.”
    <i>Polymers</i> 17, no. 11 (2025). <a href="https://doi.org/10.3390/polym17111509">https://doi.org/10.3390/polym17111509</a>.
  ieee: 'P. Albrecht, M. Altepeter, and F. Brüning, “Degradation of Polypropylene
    and Polypropylene Compounds on Co-Rotating Twin-Screw Extruders,” <i>Polymers</i>,
    vol. 17, no. 11, Art. no. 1509, 2025, doi: <a href="https://doi.org/10.3390/polym17111509">10.3390/polym17111509</a>.'
  mla: Albrecht, Paul, et al. “Degradation of Polypropylene and Polypropylene Compounds
    on Co-Rotating Twin-Screw Extruders.” <i>Polymers</i>, vol. 17, no. 11, 1509,
    MDPI AG, 2025, doi:<a href="https://doi.org/10.3390/polym17111509">10.3390/polym17111509</a>.
  short: P. Albrecht, M. Altepeter, F. Brüning, Polymers 17 (2025).
date_created: 2026-03-18T10:03:02Z
date_updated: 2026-03-18T10:08:31Z
doi: 10.3390/polym17111509
intvolume: '        17'
issue: '11'
language:
- iso: eng
publication: Polymers
publication_identifier:
  issn:
  - 2073-4360
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: Degradation of Polypropylene and Polypropylene Compounds on Co-Rotating Twin-Screw
  Extruders
type: journal_article
user_id: '59363'
volume: 17
year: '2025'
...