Thermal degradation of polylactide/aluminium diethylphosphinate

Kaya H., Hacaloğlu J.

JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS, vol.110, pp.155-162, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 110
  • Publication Date: 2014
  • Doi Number: 10.1016/j.jaap.2014.08.015
  • Journal Name: JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.155-162
  • Keywords: Polylactide, Aluminium diethylphosphinate, Thermal degradation, Direct pyrolysis mass spectrometry, Collision induced dissociation, FLAME RETARDANCY, POLYESTERS, POLYCARBONATES, NANOCOMPOSITES, SOIL
  • Middle East Technical University Affiliated: Yes

Abstract

Direct pyrolysis mass spectrometry analyses of polylactide, PLA, reveal two dominating decomposition pathways; chain homolysis and trans-esterification reactions under the experimental conditions yielding mainly low mass fragments and cyclic oligomers. The main pyrolysis products of aluminium diethylphosphinate, AlPi, are determined to be the dimeric four coordinate compounds possessing Al-O-P linkages. Thermal stability of polylactide in the presence of AlPi is decreased due to the attack of phosphinates groups on carbonyl groups. Eventually, extensive fragmentation of PLA takes place and generation of four coordinate dimeric compounds involving Al O P linkages is suppressed. On the other hand, strong evidence for generation of polyphosphinates is detected. Collision induced dissociation experiments are used to confirm the proposed structures. (C) 2014 Elsevier B.V. All rights reserved.