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Physical & Chemical properties

Stability: thermal, sunlight, metals

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Reference
Endpoint:
thermal stability
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 113 (Screening Test for Thermal Stability and Stability in Air)
GLP compliance:
yes (incl. certificate)
Test substance thermally stable:
no
Operating temp.:
>= 130 - ca. 180 °C
Operating temp.:
>= 320 °C
Sublimation:
no
Transformation products:
not measured
Test substance stable to sunlight:
not determined
Test substance stable to metals / metal ions:
not determined

In the temperature ranges of 130 °C – 180 °C a small exothermic effect was detected. At approx. 340 °C the start of another exothermic effect was observed. This exothermic effect has not been completed at 500 °C where the measurement was stopped. This second exothermic effect led to a pressure increase; thus, the bursting disk of the gold crucible was destroyed at approx. 470 °C (PN16261) and the DSC signal of thermogram PN16267 started to flutter at approx. 460 °C. The overall exothermic energy found in the measurements exceeded -760 J/g.

Conclusions:
Exothermic effects are observed upon heating of the substance above 200°C. Because the substance has no functional groups it is assumed, that the exothermic effects are due to polycondensation reactions under formation of the respective polymers and water.
The formation of water would explain the pressure increase when using closed crucibles.

Description of key information

Exothermic effects are observed upon heating of the substance above 200°C.

Additional information

Justification for classification or non-classification