N,N'-methylenedistearamide

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

07 Jun 2018 to 12 Sep 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline 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:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Remarks:

visual method (metal block) as supporting information

Key result

Atm. press.:

100.8 kPa

Decomposition:

yes

Remarks:

The test item decomposed prior to boiling

Decomp. temp.:

>= 293 °C

Remarks on result:

not determinable

Tables: Thermographic data of the preliminary screening and determinations 1 – 4. 

Thermal Event	Interpretation	Temperature
		Determination A		Determination B
		ºC	K	ºC	K
Endotherm (onset)	Loss of volatiles	90.5	363.6	90.5	363.7
Endotherm (onset)	Melting	140.5	413.6	141.5	414.7
Endotherm (left limit)	Decomposition with boiling	294.6	567.8	294.1	567.2

 After heating to 450 °C, the crucible had lost an average of 97% of the original mass.

Thermal Event	Interpretation	Temperature
		Determination 1		Determination 2
		ºC	K	ºC	K
Endotherm (onset)	Loss of volatiles	91.4	364.6	91.2	364.4
Endotherm (onset)	Melting	141.7	414.8	141.0	414.1
Endotherm (left limit)	Decomposition with boiling	293.9	567.0	293.0	566.2

Atmospheric pressure: 100.8 kPa

After heating to 450 °C, the crucibles had lost an average of 95% of their original mass. The residue in the crucible was observed to be a black solid around the periphery.

Decomposition with boiling from approximately 293 ºC (566 K) at 100.8 kPa.

Thermal Event	Interpretation	Temperature
		Determination 3		Determination 4
		ºC	K	ºC	K
Endotherm (onset)	Loss of volatiles	90.9	364.1	91.1	364.3
Endotherm (onset)	Loss of volatiles	127.5	400.7	127.5	400.7
Endotherm	Melting range	133.1 to 145.7	406.3 to 418.8	133.1 to 145.4	406.3 to 418.6

After heating to 200 °C, the crucibles had not lost mass.

The residue in the crucibles were observed to be off white brittle solid around the periphery.

Melting range: 133 to 146 ºC (406 to 419 K)

 

DISCUSSION

The melting determinations demonstrated three endotherms. The first and second were considered to be possibly due to loss of volatile constituent. The third broad endotherm was considered to be due to the melting phase transition of the test item. The shallow exotherm (not integrated) after melting up to approximately 170 °C may be due to further reaction or decomposition in the liquid state. The visual assessment confirmed the interpretation of the DSC determinations. Similar thermograms were obtained under air (preliminary/screen determinations) and nitrogen atmospheres (determinations 1 and 2) indicating the decomposition was most likely to be thermal rather than oxidative.

Conclusions:

The test item was determined to decompose with loss of decomposition products from approximately 293 ºC (567 K) at 100.8 kPa. As the test item decomposed prior to boiling, no boiling point could be determined.

Executive summary:

The study using the differential scanning calorimetry, using a procedure designed to be compatible with OECD TG 103, was performed to determine the boiling temperature of the test item in compliance with GLP. The test item was determined to decompose with loss of decomposition products from approximately 293 ºC prior to boiling, therefore no boiling point could be determined.

Description of key information

Boiling point could not be determined, decomposition temperature from approximately 293 °C, equivalent to OECD 103, differential scanning calorimentry, Butler 2018