2,2'-(vinylenedi-p-phenylene)bis[5-methylbenzoxazole]

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:

September 21st, 2017

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:

adopted July 27, 1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: OECD Guideline 113 (Screening Test for Thermal Stability and Stability in Air)

Version / remarks:

adopted May 12, 1981

Deviations:

no

GLP compliance:

yes (incl. QA statement)

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.:

280 - 284 °C

APPEARANCE OF THE SAMPLES

Before the test the appearance of test item was yellow green powder. After the experiments the test item melted in the crucible and became brown.

MEASUREMENTS

Using a linear heating rate of 10 °C/min the melting point of test item was determined to be in the range of 280 – 284 °C (553 - 557 K); no further reaction was recorded up to 500 °C.

	Experiment 1	Experiment 2	Mean
Onset of effect [°C]	280	280	280
Endset of effect [°C]	284	284	284

Experiment 1

Sample weight [mg]	Loss of Mass of the Sample (%)	Onset of effect [°C]	Endset of effect [°C]	Energy [J/g]
1.49	18.8	280.03	284.36	-106.68 (endothermic)

Experiment 2

Sample weight [mg]	Loss of Mass of the Sample (%)	Onset of effect [°C]	Endset of effect [°C]	Energy [J/g]
1.44	16.7	279.98	284.21	-108.32 (endothermic)

Conclusions:

Melting point: 280 -284 °C

Executive summary:

The thermal behaviour of test item was assessed using the DSC analysis, according to the OECD guideline 102/103 and OECD guideline 113. 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. Thus prepared capsule was inserted into the furnace of the DSC device and heated from 25 °C to 500 °C with 10 °C/minutes heating rate. 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 brown. Using a linear heating rate of 10 °C/min the melting point of test item was determined to be in the range of 280 – 284 °C (553 - 557 K); no further reaction was recorded up to 500 °C.

Conclusion

Melting point: 280 -284 °C

Description of key information

Melting point: 280 -284 °C

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

280 °C

Additional information

OECD 102 and OECD 113 - DSC analysis