2,2'-(naphthalene-1,4-diyl)bis(benzoxazole)

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:

February 09, 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

adopted July 27, 1995

Qualifier:

according to guideline

Guideline:

other: OECD Guideline No. 113 (Screening Test for Thermal Stability and Stability in Air)

Version / remarks:

adopted May 12, 1981

GLP compliance:

yes

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

The test item was used in its initial form.

Melting / freezing pt.:

209.6 - 213.8 °C

Atm. press.:

1 atm

Decomposition:

no

Remarks:

up to 500 °C

Before the test the appearance of test item was yellow green powder. After the experiments the test item melted in the crucible and became yellowish brown. Using a linear heating rate of 10 °C/min, the melting point of test item was determined to be in the range of 209.6 – 213.8 °C; no further reactions were recorded up to 500 °C.

.

Summary of DSC response

	Experiment 1	Experiment 2	Mean
Onset of effect [°C]	209.73	209.48	209.61
Endset of effect [°C]	213.54	213.98	213.76
Energy [J/g]	-86.09	-85.74	-85.91

Values recorded by DSC apparatus

	Sample weight [mg]	Loss of Mass of the Sample (%)	Onset of effect [°C]	Endset of effect [°C]	Left Limit [°C]	Right Limit [°C]	Energy [J/g]
First experiment	3.05	35.4	209.73	213.54	196.82	219.17	-86.09 (endothermic)
Second experiment	4.49	27.8	209.48	213.98	195.68	220.25	-85.74 (endothermic)

Conclusions:

The substance melts in the range of 209.6 – 213.8 °C.

Executive summary:

For the determination of the melting point differential scanning calorimetry method was used, according to the OECD guidelines 102 and 113. The test was carried out at normal atmospheric pressure.

A small amount of test item was weighed into a one-way 40 µl aluminum crucible and sealed with closed aluminum lid using a capsule presser. The measurement was performed under nitrogen atmosphere. Before and after the test, the weight and the appearance of the sample were determined. The experiment was performed in duplicate.

Before the test the appearance of test item was yellow green powder. After the experiments the test item melted in the crucible and became yellowish brown. Using a linear heating rate of 10 °C/min, the melting point of test item was determined to be in the range of 209.6 – 213.8 °C; no further reactions were recorded up to 500 °C.

Conclusion

The substance melts in the range of 209.6 – 213.8 °C.

Description of key information

The substance melts in the range of 209.6 – 213.8 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

209 °C

Additional information

OECD 102 - differential scanning calorimetry