Effect of metal ion iron on the thermo-oxidation process of polypropylene geotextiles

• Type: Article in International Conference Proceedings Book
• Date: 2019-10

Authors

Maria de Lurdes Lopes (Author) FEUP; José Ricardo Carneiro (Author) FEUP

Conference proceedings International

Title: ARC 2019 - 17th African Regional Conference on Soil Mechanics and Geotechnical Engineering

Pages: 187-191

Scientific classification

CORDIS: Technological sciences

FOS: Engineering and technology

Associated Projects

GeoSynergism - Avaliação de Efeitos Sinérgicos na Degradação de Geossintéticos (GeoSinergismo)

Other information

Abstract (EN): Oxidation is one of the main causes for the premature failure of many polymers, including those typically used for manufacturing geotextiles. This work studies the effect of metal ion iron on the thermooxidation process of three nonwoven polypropylene geotextiles stabilised with different amounts of the additives Chimassorb 944 and carbon black. For that purpose, the geotextiles were exposed in isolation (single exposures) and consecutively (multiple exposures) to two degradation tests: immersion in liquids (iron nitrate and nitric acid solutions) and thermo-oxidation. The damage suffered by the geotextiles was evaluated by comparing their tensile behaviour before and after the degradation tests. The results allowed to conclude that (1) the metal ion iron accelerated the thermo-oxidation process of the PP geotextiles, acting as a catalyst, (2) the increase of the concentration of iron led to an increase of the velocity of the thermo-oxidation process, (3) the increase of the amount of Chimassorb 944 retarded the thermo-oxidation process and (4) carbon black had no influence on the velocity of the thermo-oxidation process catalysed by iron.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5