The kinetics of the isothermal degradation of three high thermally stable aromatic polyetherketones was studied by both a longterm(about 3 years) experiment at a temperature (270 C) largely lower than the temperatures of fusion, and a set of short-termexperiments at temperatures near the temperatures of fusion. An induction period was observed at 270 C, followed by twodegradation stages, the first with an exponential increase of the weight loss rate (V) as a function of heating time (t) and the finalone showing constant weight loss rate. Short-term experiments showed similar behaviour, but no induction period was observed.The equations V=Vo2t and V=K at various temperatures were determined for the exponential and linear degradation stages,respectively. The e-folding time increased with temperature according to Arrhenius-type equations, by which the apparent activationenergy values for degradation could be determined. The results are discussed and indicate that the kinetic parameters ofdegradation change with temperature.

The Isothermal Degradation of Some Polyetherketones : a Comparative Kinetic Study between Long-term and Short-term Experiments

L. ABATE;BLANCO, Ignazio;A. POLLICINO;RECCA, Antonino
2002-01-01

Abstract

The kinetics of the isothermal degradation of three high thermally stable aromatic polyetherketones was studied by both a longterm(about 3 years) experiment at a temperature (270 C) largely lower than the temperatures of fusion, and a set of short-termexperiments at temperatures near the temperatures of fusion. An induction period was observed at 270 C, followed by twodegradation stages, the first with an exponential increase of the weight loss rate (V) as a function of heating time (t) and the finalone showing constant weight loss rate. Short-term experiments showed similar behaviour, but no induction period was observed.The equations V=Vo2t and V=K at various temperatures were determined for the exponential and linear degradation stages,respectively. The e-folding time increased with temperature according to Arrhenius-type equations, by which the apparent activationenergy values for degradation could be determined. The results are discussed and indicate that the kinetic parameters ofdegradation change with temperature.
2002
Thermogravimetric analysis; Thermal degradation; polyetherketones; kinetic parameters
File in questo prodotto:
File Dimensione Formato  
2.pdf

solo gestori archivio

Tipologia: Versione Editoriale (PDF)
Licenza: NON PUBBLICO - Accesso privato/ristretto
Dimensione 136.92 kB
Formato Adobe PDF
136.92 kB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/384
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 38
  • ???jsp.display-item.citation.isi??? 36
social impact