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Physical & Chemical properties

Boiling point

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Reference
Endpoint:
boiling point
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
Guideline:
EU Method A.2 (Boiling Temperature)
Version / remarks:
2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling point/boiling range)
Deviations:
no
GLP compliance:
no
Type of method:
other: differential scanning calorimetry / thermogravimetric analysis
Decomposition:
yes
Decomp. temp.:
> 216 °C

Above 240 °C (onset) the weight continuously decreased and reached a loss of approx. 82 % at 500 °C. The remaining residue mainly corresponds to the sodium chloride content. The DSC test traces at 216.7 °C (onset) an endothermic signal that could be allocated to a boiling behaviour, however, from the knowledge of the chemical structures this endotherm is most likely allocated to a degradation process. This assumption can also be deduced from the literature, as it is well known that quaternary structures tend to degrade above temperatures of 120 °C (Hoffmann degradation; reversed Menshutkin reaction).

Conclusions:
No boiling point was detected; decomposition starts at > 216°C.
Executive summary:

The boiling point of C8 -10 Alkylamidopropyl betaine was determined according to OECD Guideline 103 and EU method A.2 using differential scanning calorimetry and thermogravimetric analysis.

Above 240°C (onset) the weight continuously decreased and reached a loss of approx. 82% at 500°C.

The DSC test traces at 216.7°C (onset) an endothermic signal that could be allocated to a boiling behaviour, however, from the knowledge of the chemical structures this endotherm is most likely allocated to a degradation process.

This assumption can also be deduced from the literature, as it is well known that quaternary structures tend to degrade above temperatures of 120°C (Hoffmann degradation; reversed Menshutkin reaction).

Description of key information

No boiling point detected; decomposition starts at > 216°C (OECD TG 102/EU method A.2; differential scanning calorimetry / thermogravimetric analysis; RL1)

Key value for chemical safety assessment

Additional information

The boiling point of C8-10 Alkylamidopropyl betaine was determined according to OECD Guideline 103 and EU method A.2 using differential scanning calorimetry and thermogravimetric analysis.

Above 240°C (onset) the weight continuously decreased and reached a loss of approx. 82% at 500°C.

The DSC test traces at 216.7°C (onset) an endothermic signal that could be allocated to a boiling behaviour, however, from the knowledge of the chemical structures this endotherm is most likely allocated to a degradation process.

This assumption can also be deduced from the literature, as it is well known that quaternary structures tend to degrade above temperatures of 120°C (Hoffmann degradation; reversed Menshutkin reaction).