N-[3-(dimethylamino)propyl]stearamide monoacetate

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

31 Oct. 2022 - 16 Nov. 2022

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:

1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Version / remarks:

1995

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Remarks:

For a verification of the DSC-measurements a further measurement via the photo cell detection method was performed.

Key result

Boiling pt.:

> 111 - < 121 °C

Atm. press.:

1 013 hPa

Decomposition:

yes

Decomp. temp.:

ca. 190 ca. °C

1                  Boiling Point (DSC)

Results of DSC-measurements:
Four endothermic effects were detected in the temperature ranges of 40 – 60 °C, 60 – 140 °C, 150 – 220 °C and 310 – 450 °C.

Table 1:      Results of the DSC measurements

Measurement No.	Sample weight / mg	Onset of Effect / °C	Range of effect / °C	Weight loss / mg
1	9.86	52.69 68.81 155.54 366.71	40 – 60 (endo) 60 – 140 (endo) 150 – 220 (endo) 310 – 440 (endo)	9.85
2	9.61	52.46 65.64 153.97 329.85	40 – 60 (endo) 60 – 140 (endo) 150 – 220 (endo) 310 – 450 (endo)	9.61

Four endothermic effects were detected in the temperature ranges of 40 – 60 °C, 60 – 140 °C, 150 – 220 °C and 310 – 450 °C.

2                   Boiling Point (Photo Cell Detection Method)

The first measurement was carried out with visual observations. The second and third measurements were done automatically. As soon as the frequency of 0.6 Hz was reached, this temperature was evaluated as the boiling point.

Table 2:      Results of the additional tests

No.	Filling height / mm	Temperature range / °C	Heating rate / K/min	Observations
1	7	60 – 90 90 – 110 110 – 130 130 – 150 150 – 260	10	60 °C: clear, colourless liquid 90 °C: small bubbles rise 110 °C: first big bubble 111.0 °C: Frequency of 0.6 Hz exceeded 130 °C: Frequency increases, clear, colourless liquid 150 °C: Frequency decreases, clear, colourless liquid 260 °C: end of measurement, clear, yellowisch liquid
2	7	120.8	10	120.8 °C: Frequency of 0.6 Hz exceeded
3	9	119.3	1	119.3 °C: Frequency of 0.6 Hz exceeded 190 °C: end of measurement, clear, yellowisch liquid

 

3                Assessment of both methods

During the heating phase in the DSC measurement a distinct endothermic effect was observed in the temperature range of 40 – 60 °C, which can be assigned to the melting of the test item.

During the further heating phase in the DSC measurement the test item showed a second endothermic signal in the temperature range of 60 – 140 °C. The photo cell detection method visually confirmed boiling at these temperatures (90 – 150 °C).

Thus, the capillary method was performed. In two capillaries with a heating ramp of 10 K/min, boiling points of 111.0 and 120.8 °C were detected automatically by the apparatus. With correction for the air pressure (1009 and 990 mbar, respectively), the boiling range in the capillary method was 111.2 to 121.6 °C. In one capillary with a heating ramp of 1 K/min, a boiling point of 119.3 °C was detected automatically by the apparatus. With correction for the air pressure (1020 mbar), the boiling point in the capillary method was 119.1 °C.

Due to the fact that the BÜCHI Apparatus detected the boiling temperature clearly, this temperature is used as boiling range of the test item. The boiling range determined in the capillary method was 111.2 to 121.6 °C

A third endothermic signal is observed in the DSC measurement in the temperature range of 140 – 220 °C. The photo cell detection method visually confirmed boiling at these temperature range (150 – 260 °C) with decreasing frequency. At the end of the measurement with a heating ramp of 1 K/min at 190 °C the test item began to change colour from colourless to yellow. This suggests that a decomposition reaction is starting.

The fourth endothermic signal which is observed in the DSC measurement in the temperature range from 310 – 450 °C could not be clearly assigned to the boiling of the test item. Perhaps it is further decomposition of the test item.

No further thermal effects were observed up to the test end temperature of 500 °C.

4                Final Results

The test item NDPSa has a boiling range from 111 °C to 121 °C at atmospheric pressure (1013 hPa) as determined by differential scanning calorimetry and by the photo cell detection method according to Regulation EC No. 440/2008 Method A.2. and OECD Test Guideline 103 (1995).

 

 

Conclusions:

The test item NDPSa has a boiling range from 111 °C to 121 °C at atmospheric pressure (1013 hPa) as determined by differential scanning calorimetry and by the photo cell detection method.

Executive summary:

Test Design: The determination of the boiling point of the test item was performed using Differential Scanning Calorimetry (DSC). For a verification of the DSC-measurements a further measurement via the photo cell detection method was performed.
Result: The test item has a boiling range from 111 °C to 121 °C at atmospheric pressure (1013 hPa) as determined by differential scanning calorimetry and by the photo cell detection method.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

111 °C

Temperature of decomposition (state purity):

190 °C