Formulation, rheology and thermal ageing of polymer greases-Part I: Influence of the thickener content

• Type: Article in International Scientific Journal
• Date: 2015

Authors

Goncalves, D (Author) Other; Graca, B (Author) Other; Campos, AV (Author) Other; Jorge Seabra (Author) FEUP; Leckner, J (Author) Other; Westbroek, R (Author) Other

Journal

Title: Tribology International

Vol. 87

Pages: 160-170

ISSN: 0301-679X

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 17 Citations

Scopus - 25 Citations

Other information

Authenticus ID: P-00G-42V

DOI: 10.1016/j.triboint.2015.02.018

Abstract (EN): The aim of this work is to show the correlation between polymer greases' rheology and its formulation. The tested polypropylene (PP) thickened greases were evaluated regarding their thickener content and its effect on the rheological properties. An artificial ageing procedure was performed by heating fresh grease samples in an oven to study the thermal degradation. The ageing evaluation was performed through rheological measurements, FT-IR spectra, oil loss, bleed-oil viscosity changes and bleed rate. The rheology measurements were performed on a rotational rheometer, emphasizing on the storage and loss moduli values at the Linear Visco-Elastic (LVE) region. The flow curve of each grease was also measured. A modified Herschel-Buckley model was applied and the data was correlated to the thickener content.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11