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Stabilizer Migration in Polyolefins determined by FTIR
KTH, School of Chemical Science and Engineering (CHE).
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Fördelning av Stabilisatorer i Polyolefiner detekterat med FTIR (Swedish)
Abstract [en]

The purpose of this study was to develop a method for analyzing the distribution of stabilizers, containing hindered phenols, in polyolefins with Fourier Transform Infrared Spectroscopy (FTIR). The peak from the hindered phenol is weak and difficult to detect with FTIR, but trough reaction chlorine dioxide (ClO2) a quinone structure is formed that binds water which gives a much stronger signal in the spectrum. The aim was to  investigate whether or not it is possible to relate the absorbed amount of water to the concentration of stabiliser in the polymer.

 

The results were that the stabilizers in a material can be related to the water absorption within a material, but not between different materials. This is based on the result from FTIR line scan that shows how the water absorption peak of a ClO2 exposed PP follows the same pattern as the ester peak of an unexposed PP over a cross section. The water absorption could not be related to the amount of stabilizers when different materials were compared since the materials absorbed unequal amounts of water.

 

The water absorption peak increases with time until it stabilizes after 6 days (144 hours), thus when all hindered phenols have reacted with chlorine dioxide. The concentration of chlorine dioxide was of less importance for the water absorption as long as ClO2 was in excess relative the hindered phenols, for this study, 0,1 g/L was enough.  It was also concluded that reaction with ClO2 was more effective in 50°C than in room temperature since a larger water absorption peak was obtained at this temperature. The method can also be considered repeatable within a specific material since similar values ​​of the water absorption peak was obtained at separate experiments.

 

Irganox 1330 was identified with HPLC in all of the polyolefins. There were also other hindered phenols present in most of the other polymers but they could not be identified due to overlaps. Because of the similar molecular structure of Irganox 1010 and Irganox 1076, it was impossible to achieve separation with an isocratic HPLC since they were affected in the same way by the solid and mobile phase.

 

Place, publisher, year, edition, pages
2014.
Keywords [en]
chlorine dioxide, polyolefins, hindered phenols, fourier transform infrared spectroscopy (FTIR)
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-213016OAI: oai:DiVA.org:kth-213016DiVA, id: diva2:1136449
Available from: 2017-08-28 Created: 2017-08-28 Last updated: 2017-08-28Bibliographically approved

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