Thermal oxidation of poly(ethylene oxide-propylene oxide-ethylene oxide) triblock copolymer: focus on low molecular weight degradation products
2002 (English)In: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 77, no 1, 55-66 p.Article in journal (Refereed) Published
The oxidative thermal degradation of poloxamer 407, a poly(ethylene oxide-propylene oxide-ethylene oxide) triblock copolymer, at 50 and 80 degreesC in air was studied by solid phase microextraction/gas chromatography-mass spectrometry (SPME/GC-MS). At 80 degreesC, we found that degradation was initiated on the PPO block of the copolymer by three mechanisms involving hydroperoxyl formation and depropagation. 1,2-propanediol,1-acetate; 1,2-propanediol,2-formate; 1, 2-propanediol,1-acetate, 2-formate and 2-propanone,1-hydroxy were the first degradation products produced. Random chain scissions and a sharp decrease in the molecular weight of the material followed the initiation period. Formic acid and acetic acid, formed upon degradation, participated in esterification reactions leading to the formation of the formate and acetate forms of 1,2-propanediol and ethanediol. Though degradation at 50 degreesC was much slower, the oxidative mechanisms leading to low molecular weight formates and acetates were the same as those observed at 80 degreesC.
Place, publisher, year, edition, pages
2002. Vol. 77, no 1, 55-66 p.
thermal oxidation, triblock copolymer, poloxamer, SPME/GC-MS, poly(propylene oxide), polypropylene, chemiluminescence, mechanism
IdentifiersURN: urn:nbn:se:kth:diva-21619ISI: 000176218900007OAI: oai:DiVA.org:kth-21619DiVA: diva2:340317
QC 201005252010-08-102010-08-10Bibliographically approved