Accelerated oxidative ageing of polypropylene fibers in aqueous medium under high oxygen pressure as studied by thermal analysis
Stabilised polypropylene fibres of 28 μm diameter have been exposed at 80 °C under 5 MPa oxygen pressure, in dry conditions, in pure water and in alkaline medium. Their residual stability is determined from the temperature T ox of the onset of the oxidation exotherm, measured by differential scannin...
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Published in | Polymer testing Vol. 23; no. 8; pp. 919 - 923 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Oxford
Elsevier Ltd
01.12.2004
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Stabilised polypropylene fibres of 28 μm diameter have been exposed at 80 °C under 5 MPa oxygen pressure, in dry conditions, in pure water and in alkaline medium. Their residual stability is determined from the temperature
T
ox of the onset of the oxidation exotherm, measured by differential scanning calorimetry at 10 K min
−1 scanning rate. The time
t
ex to reach the characteristics of unstabilised samples (
T
ox=175 °C) is of the order of 220 (dry conditions), 160 h (water) and 80 h (alkaline medium), whereas it is of the order of 750 h at 110 °C in classical tests made at atmospheric pressure. This increase of ageing rate is discussed in terms of kinetic effect of O
2 pressure and efficiency of the liquid medium to extract stabilisers. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0142-9418 1873-2348 |
DOI: | 10.1016/j.polymertesting.2004.05.002 |