2-Propenoic acid, 2-methyl-, 2-hydroxyethyl ester, reaction products with phosphorus oxide

Stability: thermal, sunlight, metals

Link to relevant study record(s)

Reference

Endpoint:

thermal stability

Type of information:

experimental study

Adequacy of study:

key study

Study period:

March 17, 2015

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study without detailed documentation

Principles of method if other than guideline:

Accelerated rate calorimeter (ARC) method

GLP compliance:

not specified

Specific details on test material used for the study:

Lot no.: LJBKA0011S

Test substance thermally stable:

no

Key result

Operating temp.:

ca. 124 °C

Remarks on result:

other: small exotherm onset

Key result

Operating temp.:

ca. 130 °C

Remarks on result:

other: small exotherm onset

Key result

Operating temp.:

ca. 160 °C

Remarks on result:

other: hightly energetic exotherm onset

Remarks:

attributed to the thermally initiated polymerization of the test substance followed by gassy decomposition

Test substance stable to sunlight:

not determined

Test substance stable to metals / metal ions:

not determined

Heating the test substance in an ARC produced two small exotherms with onset detected at ~124°C and ~130°C with an adiabatic temperature rise lower than 3°C. Continuing the test after the exotherms were completed resulted in a highly energetic exotherm with onset detected at ~160°C, attributed to the thermally initiated polymerization of the material followed by gassy decomposition. Onset of gas generation coincided with the onset of the main exotherm.

The ARC run utilized the following test conditions, and produced the following results:

Material tested	Test substance
Run No.	ARC-10975A
Run type	Heat Wait Search
O Factor	1.6047
Test Cell	Stainless
Exothermic Onset Detection Temp, °C	124; 130; 160
DeltaH, -kJ/kg (1)	2.8 (between 1 and 284) (2)
Adiaatic DeltaT, °C	1.3 (between 1 and 135) (2)
Temperature range in test, °C	30 -326 (2)
Gas generation onset temperature, °C	ca. 170
Cool down pressure, bara	41.2

(1) Heat release calculations are based on an estimated heat capacity of 2.1 kJ/(kg°K)

(2) Test was automatically stopped before the decomposition exotherm was completed since 50 bar pressure limit was reached.

Conclusions:

Under the study conditions, the thermal stability of the test substance was modified at 124, 134, and 160°C.

Executive summary:

A study was conducted to determine the thermal stability of the test substance according to the Accelerated Rate Calorimeter (ARC) method. When heated, the test substance produced two small exotherms with onset detected at ~124°C and ~130°C with an adiabatic temperature rise lower than 3°C. The heat-wait-search was continued after the exotherm was completed. A highly energetic exotherm occurred with onset detected at ~160°C, attributed to the thermally initiated polymerization of the material followed by gassy decomposition. Onset of gas generation coincided with the onset of the main exotherm. Under the study conditions, the thermal stability of the test substance was modified at 124, 134, and 160°C (Martens, 2004).

Description of key information

The thermal stability of the test substance was determined according to the Accelerated Rate Calorimeter (ARC) method (Martens, 2004).

Additional information

The test substance produced two small exotherms at 124 and 130°C and an highly energetic exotherm at 160°C (attributed to thermally initiated polymerisation and decomposition).