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In situ X‐ray absorption spectroscopy at the K‐edge of red phosphorus in polyamide 6,6 during a thermo‐oxidative degradation
Author(s) -
Küper Gerhild,
Hormes Josef,
Sommer Klaus
Publication year - 1994
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1994.021950524
Subject(s) - xanes , polyamide , extended x ray absorption fine structure , chemistry , absorption spectroscopy , analytical chemistry (journal) , absorption (acoustics) , spectroscopy , polymer , degradation (telecommunications) , materials science , polymer chemistry , organic chemistry , telecommunications , physics , quantum mechanics , computer science , composite material
We present a new method for studying the influence of flame retardants as a function of time and temperature by measuring the X‐ray absorption spectra of the corresponding additive. Here, red phosphorus in polyamide 6,6 was investigated at the phosphorus K‐edge using synchrotron radiation. The thermo‐oxidative degradation of the polymer was simulated by heating the sample up to 300°C. XANES XANES, EXAFS: X‐ray absorption spectroscopy investigating the near edge structure or the fine structure of the extended region, respectively. spectra were monitored during the degradation process at different temperatures and at a constant reaction temperature as a function of time. The degradation reaction was analyzed by comparing the XANES spectra of red phosphorus and orthophosphoric acid, and the reaction was identified as an oxidation of red phosphorus to H 3 PO 4 . The results so obtained are confirmed by the EXAFS spectra of the additive in the polymer sample recorded before and after the thermo‐oxidative degradation process, and by the EXAFS spectra of suitable reference compounds.