Total Luminescence Intensity (TLI) Offers Superior Early Oxidation Detection in Unstabilised Polyethylene but is no better than FT-IR for Stabilised Polyolefins
2006 (English)In: European Polymer Journal, ISSN 0014-3057, E-ISSN 1873-1945, Vol. 42, no 8, 1855-1865 p.Article in journal (Refereed) Published
In an earlier study, we have shown that chemiluminescence (CL) and the total luminescence intensity (TLI) method are highly sensitive to oxidation in degradable PE. In this study, stabilised PE and PP were characterised with CL in an inert (TLI) and in an oxygen atmosphere (CL-OIT) and the results were compared to those obtained by the commonly used techniques, FT-IR (carbonyl index (CI)) and thermal analysis (DSC-OIT). PE was aged at a low temperature (80 degrees C) and PP was aged at temperatures between 60 and 120 degrees C. Non-Arrhenius behaviour was observed in the oxidation of PP. This showed the importance of aging at a low temperature to obtain realistic results. TLI and Cl of stabilised PP and most of the stabilised PE gave comparable results with the same sensitivity for oxidation detection. This was in contrast to our previous results for degradable PE. However, TLI of unstabilised PE showed earlier oxidation detection than Cl, which agreed with our earlier results. TLI of PE had a higher sensitivity than CL-OIT, and both TLI and Cl of PP were sufficiently sensitive to detect the effect of aging at different temperatures, whereas DSG-OIT was not.
Place, publisher, year, edition, pages
2006. Vol. 42, no 8, 1855-1865 p.
chemiluminescence (CL), infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), stabilisation, polyolefins
IdentifiersURN: urn:nbn:se:kth:diva-5754DOI: 10.1016/j.eurpolymi.2006.02.005ISI: 000240727000016ScopusID: 2-s2.0-33745736601OAI: oai:DiVA.org:kth-5754DiVA: diva2:10229
Uppdaterad från in press till published: 20100921
QC 201009212006-05-172006-05-172010-09-21Bibliographically approved