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Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
28 November 2011- 03 February 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The study has been performed according to OECD and EC guidelines and according to the principles of GLP.
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
(2008)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
(1995)
Deviations:
no
GLP compliance:
yes
Type of method:
thermal analysis
Melting / freezing pt.:
-46 °C
Decomposition:
yes
Decomp. temp.:
> 200 °C
Remarks on result:
other: glass transition
Melting / freezing pt.:
228 K
Decomposition:
yes
Decomp. temp.:
> 473 K
Remarks on result:
other: glass transition

Preliminary TGA:

From 300°C upwards the weight of the sample decreased significantly. At 351°C, the sample weight had decreased by 25%. After the experiment, brown residue was observed on the lid of the sample container and a brown residue remained in the sample container (original colour: colourless). The change of the colour indicated reaction and/or decomposition of the test substance. The TGA-curve of the test substance is shown in Figure 4 of the study report (see attached document).

DSC experiments:

During cooling, a glass transition was observed between -40°C and -75°C.

Experiment 1: During heating, a glass transition between -75°C and -25°C was observed. The inflection point of the glass transition (macroscopically equivalent to the melting point) of the test substance was -45.62°C. An exothermic peak was observed from 200°C. The effect was due to reaction and/or decomposition of the test substance. After the experiment, a yellow residue remained in the sample container. The change of the colour indicated reaction and/or decomposition of the test substance. DSC curve: Figure 5 (see attached document).

Experiment 2: Similar results to the first experiment were obtained. The inflection point of the glass transition was -45.50°C. After the experiment, the sample appeared to have been unchanged, i.e. no decomposition and/or evaporation were observed. DSC curve: Figure 6 (see attached document).

Conclusions:
The melting temperature (glass transition) of bis(2,3-epoxypropyl) cyclohexane-1,2-dicarboxylate is -46°C. Decomposition occurs at temperatures > 200°C.

Description of key information

The melting temperature (glass transition) of bis(2,3-epoxypropyl) cyclohexane-1,2-dicarboxylate is -46°C. 

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-46 °C

Additional information

The melting temperature (glass transition) of bis(2,3-epoxypropyl) cyclohexane-1,2-dicarboxylate is -46°C. Decomposition occurs at temperatures > 200°C.