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EC number: 224-292-6
CAS number: 4292-10-8
In a study conducted according to OECD Guideline 103, the boiling point
of C12 AAPB was investigated using differential scanning calorimetry
(DSC). In a preliminary test a thermogravimetric measurement was carried
out. Based on this result a boiling point of ca. 265°C was estimated.
For the ultimate determination the DSC method was applied. The DSC-curve
showed in the first heating run a defined endothermic signal in the
range between 30 and 100°C. The peak at ca. 76°C with an offset
temperature of 66°C has a heat flow of approx. 113 J/g. This is within
the typical range for melting processes of an organic material. Further
DSC tests in the temperature range -70 to 130°C with three heating
cycles were done. However, in the cooling runs and the following second
and third heating runs no peak was observed in the range of 76°C. A
further big peak was observed in the range from 190 to 260°C. The heat
flow, proportional to the peak area was determined as ca. 128 J/g. This
is also within the typical range for melting processes of an organic
material. However, both in the cooling run and the following second
heating run no peak was observed in the range of 238°C as is expected
for a typical, reversible melting process. Hence the signal observed at
76 and 238°C during the first heating run does not reflect typical
melting processes, but processes when C12 AAPB decomposes, possibly
associated with a melting process. In summary, a boiling point was not
identifyable due to decomposition of the test material.
C8-18 AAPB: not identifyable due to decomposition of the test substance in the range between 208 and 280°CC12 AAPB: not identifyable due to decomposition of the test substance in the range between 60 and 260°C
In studies conducted according to OECD Guideline 103, the boiling points
of C8 -18 AAPB and C12 AAPB were investigated using differential
scanning calorimetry (DSC). Boiling points were not identifyable due to
decomposition of the test material in the range between 208 and 280°C
(C8 -18 AAPB) and between 60 and 260°C (C12 AAPB). Based on these
results it can be assumed that a weak chemical bond is present in the
molecule which is unstable towards elevated temperatures. All
AAPBs are similar in structure, contain all the same zwitterionic
structure. They differ, however, by their carbon chain length
distribution and the degree of unsaturation (<=20%) in the fatty acid
moiety. The content of minor constituents in all products are comparable
and differ to an irrelevant amount. Based on the available data, it can
be assumed that chain length distribution and degree of unsaturation of
the fatty acid chain have no or at the most a minor impact on this
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