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Evaluation of Long-Term Performance of Antioxidants Using Prooxidants instead of Thermal Acceleration
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
2005 (English)In: Journal of Polymer Science Part A: Polymer Chemistry, ISSN 0887-624X, E-ISSN 1099-0518, Vol. 43, no 19, 4537-4546 p.Article in journal (Refereed) Published
Abstract [en]

Evaluation of stabilization efficiencies of different antioxidants in polymers at low temperature and relatively short time was performed using incorporation of a prooxidant for catalytic oxidation. Comparisons were made between polypropylene films stabilized with primary antioxidants (Irganox 1076, Irganox 1010, and α-tocopherol), with or without the prooxidant manganese stearate at different temperatures. A faster degradation was obtained in the presence of a prooxidant than without it. The relative efficiency of the antioxidants at prooxidant acceleration correlated better to low temperature long-term test than at the thermal acceleration. The results were affected by initial differences in the amounts of the antioxidants present after the processing of the films. These differences were corrected for by a recalculation using microwave-assisted extraction (MAE) and high performance liquid chromatography analysis from the exponential decrease in the amount of antioxidant in the films. The fastest comparison of the antioxidants efficiency was obtained from oxidation induction times, using total luminescence intensity measurements, but reliable results could also be obtained from the time to apparent failure.

Place, publisher, year, edition, pages
2005. Vol. 43, no 19, 4537-4546 p.
Keyword [en]
Accelerated aging, Antioxidants, Microwave-assisted extraction, Polyolefins, Stabilization
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-5139DOI: 10.1002/pola.20936ISI: 000231989400022Scopus ID: 2-s2.0-27744540061OAI: oai:DiVA.org:kth-5139DiVA: diva2:7934
Note
QC 20100914. Uppdaterad från Accepted till Published (20100914)Available from: 2005-05-25 Created: 2005-05-25 Last updated: 2017-12-04Bibliographically approved
In thesis
1. Chromatography and extraction techniques for new evaluation methods of polyolefins long-term performance
Open this publication in new window or tab >>Chromatography and extraction techniques for new evaluation methods of polyolefins long-term performance
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Chromatography and extraction techniques, and also chemiluminescence have been utilized to develop new rapid and informative tools in the evaluation of long-term properties and environmental effects of polymeric materials.

Methods were developed for classification of materials and for early and rapid degradation detection. Degradable polyethylene films were classified on the basis of their incorporated prooxidant systems using chromatographic fingerprinting of carboxylic acids, the dominating type of degradation product. The fingerprints were also shown to be useful for prediction of the degradation states and evaluation of the degradation mechanisms. Classification and prediction models were obtained by Multivariate Data Analysis, where the diacids were grouped according to both their type of prooxidant system and their state of degradation. The use of total luminescence intensity (TLI) measurements was also investigated as a means of classifying films and for the early detection of degradation. Comparisons were carried out with common techniques, e.g. FTIR and DSC, after both thermal and UV oxidation. TLI gave an earlier detection of degradation and was more sensitive than carbonyl index and crystallinity measurements to relative differences in degradation between the materials. It furthermore offered complementary information regarding changes in activation energies during the course of the degradation. The results were compared with the chromatographic fingerprints.

A new way to evaluate the low temperature long-term stabilisation efficiency of antioxidants was investigated. A prooxidant was used to obtain catalytic oxidation, instead of using thermal acceleration, to evaluate the stabilisation efficiency of antioxidants at low temperatures but still during reasonably short aging times. Comparisons were made between polypropylene films stabilised with primary antioxidants (Irganox 1076, Irganox 1010 and α-tocopherol) with and without the prooxidant manganese stearate at different temperatures. The relative efficiencies of the antioxidants obtained under prooxidant acceleration test correlated better than thermal acceleration test with the results of a long-term low temperature test.

Additives in plastic packaging materials may affect the environment after migration from the packaging to e.g. their contents, especially if they consist of organic aqueous solutions or oils. The use of Solid-Phase Microextraction (SPME) for the specific task of extraction from an organic aqueous solution such as a simulated food or pharmaceutical solution consisting of 10 vol-% ethanol in water was investigated. Methods were developed and evaluated for extraction both with direct sampling and with headspace sampling. If the extraction method and temperature were selected to suit the concentration levels of the analytes, it was possible to quantify several degradation products simultaneously. Comparisons made with Solid Phase Extraction showed the advantage of SPME for this purpose.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. 86 p.
Series
Trita-FPT-Report, ISSN 1652-2443 ; 2005:20
Keyword
Chemical engineering, polymer, chromatographic fingerprinting, gas-chromatography – mass spectrometry, GC-MS, degradable polyethylene, prooxidant systems, chemiluminescence, oxidation, degradation mechanisms, accelerated ageing, antioxidants, transformation products, microwave assisted extraction, MAE, solid-phase microextraction, SPME, volatiles, solid phase extraction, SPE, Kemiteknik
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-219 (URN)91-7178-097-1 (ISBN)
Public defence
2005-06-16, K2, Teknikringen 28, Stockholm, 13:00
Opponent
Supervisors
Note
QC 20100929Available from: 2005-05-25 Created: 2005-05-25 Last updated: 2010-09-29Bibliographically approved

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