Fatty acids, C16-18 (even numbered), reaction products with diethylene triamine, di-Me sulfate quaternized

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2017-11-08 to 2018-04-13

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Version / remarks:

27 July 1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Version / remarks:

30 May 2008

Deviations:

no

GLP compliance:

no

Type of method:

differential scanning calorimetry

Key result

Atm. press.:

1 013 Pa

Decomposition:

yes

Decomp. temp.:

>= 280 °C

The thermic behaviour of hydrogenated tallow/ nortallow base IQAC was tested with a boiling point capillary from room temperature up to 300 °C with a heating rate of 10 °C/min. Arising bubbles were observed from approx. 170°C with increasing intensity up to 255 °C where hydrogenated tallow/ nortallow base IQAC appears boiling. At approx. 290 °C the sample is totally black.

In the TGA test, a sample of the test item was heated from 30 °C to 675 °C in an inert gas atmosphere (N 2 ). The main drop was detected beginning at 306.4 °C (onset). Up to 675 °C a total weight loss of 94.8 % was recorded.

Conclusions:

Hydrogenated tallow/nortallow base IQAC does not provide a boiling point until disintegration at about 280 °C.

Executive summary:

In a study conducted according to OECD guideline 103, the boiling behaviour of hydrogenated tallow/nortallow base IQAC was determined by thermogravimetric measurements, differential scanning calorimetry and by the capillary method. During TGA the recorded main weight loss above 306.4 °C (estimated onset on TGA) may have indicate a beginning evaporation (boiling), 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).  

In order to provide evidence for this assumption, a degradation test was performed during which an aliquot of the sample was heated to 280 °C for 15 minutes. The remaining residue (97 % of the original material) war characterised by NMR spectroscopy. The NMR analysis confirms the decomposition of the product. Consequently, hydrogenated tallow/nortallow base IQAC does not provide a boiling point until disintegration at about 280 °C.

Description of key information

- study conducted according to OECD guideline 103, differential scanning calorimetry, thermogravimetric measurement, capillary method

Additional information

In a study conducted according to OECD guideline 103, the boiling behaviour of hydrogenated tallow/nortallow based IQAC was determined by thermogravimetric measurements, differential scanning calorimetry and by the capillary method. During TGA the recorded main weight loss above 306.4 °C (estimated onset on TGA) may have indicate a beginning evaporation (boiling), 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).  

In order to provide evidence for this assumption, a degradation test was performed during which an aliquot of the sample was heated to 280 °C for 15 minutes. The remaining residue (97 % of the original material) war characterised by NMR spectroscopy. The NMR analysis confirms the decomposition of the product. Consequently, hydrogenated tallow/nortallow based IQAC does not provide a boiling point until disintegration at about 280 °C.