N,N-bis(2-hydroxyethyl)undec-10-enamide

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From October 11, 2017 to October 20, 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Deviations:

no

GLP compliance:

not specified

Type of method:

differential scanning calorimetry

Remarks:

Capillary Method, DSC, TGA

Key result

Decomposition:

yes

Decomp. temp.:

> 200 °C

Remarks on result:

not determinable

Capillary method

In the melting point system beginning at a temperature of 180 °C to 200 °C the colour of the specimen starts to change from white to slightly yellowish brown.

DSC/TGA

Within the first heating period of the preliminary DSC test, a small endothermic signal was recorded over a temperature range of approximately 118 °C - 180 °C without a significant weight loss (2%). This endothermic could not be observed at the second heating period, which indicates that this may be related to the evaporation of a by-product.

Other signals could not be observed. After the DSC analysis, the sample was re-weighed in order to check for a significant sample loss indicating potential interfering, non-melting processes. Additionally, after the performance of the test, the crucibles were re-opened and the residue was inspected visually. At the test (up to 200°C) a weight loss of 3.6 % was recorded. The residue appeared as a yellowish liquid.

Final test:

In the TGA test, a sample of the test substance was heated from 30 °C to 675 °C in an inert gas atmosphere (N2). Starting at 198 °C a constantly increasing weight loss was recorded. Until 450 °C the sample lost 92 % of its weight. Above 460 °C the weight loss increases significantly. At 670 °C a total loss of loss of more than 98 % was recorded.

In the DSC test no reproducible phase transitions was observed in the successive heating periods. This corresponds to the visual observation where the substance remained undisturbed until approximately 180 °C.

The recorded weight loss above 198 °C (estimated onset on TGA) may indicate a beginning evaporation (boiling), however, with respect to the visual observation a decomposition of the test substance appears to be more likely. In order to provide evidence for this assumption, a degradation test was performed during which an aliquot of the sample was heated to 200°C for 15 minutes (estimated start of the boiling range) and the remaining residue was characterised by NMR spectroscopy. The NMR analysis confirms the decomposition of the product.

Consequently, the test substance does not provide a boiling point until disintegration at about 200 °C.

Conclusions:

Under the study conditions, no boiling point was detected, decomposition occures above 200 °C (1010 hPa).

Executive summary:

A study was conducted to determine the boiling point of the test substance according to OECD Guideline 103 and EU Method A.2. The boiling temperature of the test substance was determined by thermogravimetry and differential scanning calorimetry. In the TGA test, a sample of the test substance was heated from 30 °C to 675 °C in an inert gas atmosphere (N2). Starting at 198 °C a constantly increasing weight loss was recorded. Until 450 °C the sample lost 92 % of its weight. Above 460 °C the weight loss increases significantly. At 670 °C a total loss of loss of more than 98 % was recorded. In the DSC test no reproducible phase transitions was observed in the successive heating periods. This corresponds to the visual observation where the substance remained undisturbed until approximately 180 °C. Subsequently a degradation test was performed during which an aliquot of the sample was heated to 200 °C for 15 minutes (estimated start of the boiling range) and the remaining residue was characterised by NMR spectroscopy. The NMR analysis confirms the decomposition of the product. Under the study conditions, no boiling point was detected, decomposition occures above 200 °C (1010 hPa) (Mund, 2017).

Description of key information

The boiling point was determined according to OECD Guideline 103 and EU Method A.2 (Mund, 2017).

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

200 °C

Additional information

The test substance started to decompose at this temperature.