1,4-phenylenebis(nitrilo-2,2-dimethylprop-1-yl-3-ylidene) didodecanoate

Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2015-08-12 to 2016-02-17

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

2008

Deviations:

no

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7200 (Melting Point / Melting Range)

Version / remarks:

1996

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Key result

Melting / freezing pt.:

13 °C

Atm. press.:

1 013.25 hPa

Decomposition:

no

Sublimation:

no

Values DSC (differential scanning calorimetry) test Item summary

 

Peak	Experiment 1	Experiment 2	Mean	Remark
FP	-40 °C	-40 °C	-40 °C	Freezing point
MP1	-40 °C	-26 °C	-26 °C	Polymorphisms melting
MP2	-40 °C	-22 °C	-22 °C	Polymorphisms recrystallization
MP3	-12 °C	-13 °C	-13 °C	Polymorphisms melting
MP4	-8 °C	-9 °C	-9 °C	Polymorphisms recrystallization
MP5	13 °C	12 °C	13 °C	Melting point

 

Conclusions:

The melting point was determined via DSC (differential scanning calorimetry) according to OECD guideline 102. From the results of the DSC curves a freezing point of – 40 °C and a melting point of 13 °C was determined. During heating of the solidified test item two polymorphic transitions before final melting were observed.

Executive summary:

The melting point was determined via DSC (differential scanning calorimetry) according to OECD guideline 102. During the cooling down phases of the DSC runs one exothermic peak could be observed, which was assigned to the freezing temperature of the test item. The Onset of the peaks was used for the calculation of the mean freezing point. During the melting phase five sig-nals were observed. From the three endothermic peaks the first two are followed directly by an exothermic peak. Therefore, the first two endothermic and exothermic events can be considered to be caused by polymorphisms (endothermic melting peak followed an imme-diate exothermic recrystallization). As melting point the mean of the temperatures at the peak maximum of the last endothermic events was evaluated, as the Onset could not be determined properly. From the results of the DSC curves a freezing point of – 40 °C and a melting point of 13 °C was determined. During heating of the solidified test item two polymorphic transitions be-fore final melting were observed. After the experiments the test item was unchanged in the crucibles.

Description of key information

The melting point was determined via DSC (differential scanning calorimetry) according to OECD guideline 102. From the results of the DSC curves a freezing point of – 40 °C and a melting point of 13 °C was determined. During heating of the solidified test item two polymorphic transitions before final melting were observed.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

13 °C

Additional information

The melting point was determined via DSC (differential scanning calorimetry) according to OECD guideline 102. During the cooling down phases of the DSC runs one exothermic peak could be observed, which was assigned to the freezing temperature of the test item. The Onset of the peaks was used for the calculation of the mean freezing point. During the melting phase five sig-nals were observed. From the three endothermic peaks the first two are followed directly by an exothermic peak. Therefore, the first two endothermic and exothermic events can be considered to be caused by polymorphisms (endothermic melting peak followed an immediate exothermic recrystallization). As melting point the mean of the temperatures at the peak maximum of the last endothermic events was evaluated, as the Onset could not be determined properly. From the results of the DSC curves a freezing point of – 40 °C and a melting point of 13 °C was determined. During heating of the solidified test item two polymorphic transitions before final melting were observed.