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Diffusion-limited oxidation of polyamide: Three stages of fracture behavior
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
Volvo Car Corp, Polymer Ctr, SE-40531 Gothenburg, Sweden..
Scania CV AB, Mat Technol, SE-15187 Sodertalje, Sweden..
Scania CV AB, Mat Technol, SE-15187 Sodertalje, Sweden..
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2018 (English)In: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 154, p. 73-83Article in journal (Refereed) Published
Abstract [en]

Polyamides (PAs) frequently experience diffusion-limited oxidation (DLO) under elevated temperatures due to their combination of relatively high oxygen barrier properties and high susceptibility to, and rate of, oxidation; under DLO conditions, oxidation is uneven and limited to a thin surface layer. In this study, the reduced extensibility/embrittlement of unstabilized PA6 under DLO conditions was understood by revealing DLO-induced fracture behavior. The DLO was induced by thermally ageing PA6 samples at 180 degrees C; the built-up of the thin oxidized layer by ageing was revealed by infrared microscopy. Notably, the formation of the thin oxidized layer significantly reduced the strain-at-break. Depending on whether the oxidized layer was brittle, two types of surface behavior (voiding and cracking) occurred during the tensile tests, which in turn lead to three types (stages) of tensile fracture behavior. In particular, in the early stage (Stage I) of ageing, the fracture was caused by a long crack formed by the coalescence of adjacent surface voids, leading to a decrease in the strain-at-break from 300% to 30%. In Stage II, multiple surface cracks, which initiated in the oxidized layer, was arrested by the interface between the oxidized and unoxidized material, leading to an almost constant strain-at-break (at or close to the necking strain). Maximum brittleness occurred in Stage III, where a more extensive oxidation of the oxidized layer initiated cracks with high propagation rate, causing the interface to be unable to arrest the cracks. 

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2018. Vol. 154, p. 73-83
Keywords [en]
Diffusion-limited oxidation, Polyamide, Surface-induced embrittlement, Fracture behavior, Cracks, Mechanical properties
National Category
Other Materials Engineering Textile, Rubber and Polymeric Materials
Identifiers
URN: urn:nbn:se:kth:diva-234202DOI: 10.1016/j.polymdegradstab.2018.05.024ISI: 000441488100008Scopus ID: 2-s2.0-85047652570OAI: oai:DiVA.org:kth-234202DiVA, id: diva2:1246365
Note

QC 20180907

Available from: 2018-09-07 Created: 2018-09-07 Last updated: 2018-09-07Bibliographically approved

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Wei, Xin-FengGedde, Ulf WHedenqvist, Mikael S.

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Wei, Xin-FengGedde, Ulf WHedenqvist, Mikael S.
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Fibre- and Polymer TechnologyPolymeric Materials
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Other Materials EngineeringTextile, Rubber and Polymeric Materials

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