The thermal oxidation reactions of thin film (thickness 16170 μm) of trilinoleoylglycerol (TLEG) were investigated by thermogravimetric analysis.
By thermal oxidation reactions the weight of TLEG increased in the temperature range of 25°C to 170°C in air and in oxygen [heating rate : 2°C/min]. Elemental analysis of these sampleswas carried out and their compositions were determined.
At 90°C, 1 mol of the hydroperoxide of TLEG (TLEGHPO) was formed for 5.6 mol of TLEG, and agreement between calculated and found values was whthin the usual limits of variation of elemental analysis ; degradation reactions did not occur.
At 104°C, 1 mol of TLEGHPO was formed for 3.3 mol of TLEG. The dehydrogenation of TLEGHPO started at this temperature.
At 130°C, 1 mol of TLEGHPO was formed for 1.1 mol of TLEG. The degradation of TLEGHPO occurred slightly at C-C and C-H bonds of TLEGHPO.
At 155°C, the degradation of C-C and C-H bonds of TLEGHPO occurred.
The relationship between maximum increase in weight
Y (% μg/cm
2) and film thickness of TLEG
X (μm) is given by the following equations.
Film thickness Equation Atmospheres
< 30 μm
Y=6.6
X in air
30μm130μm
Y=2.2
X+150 in air
130μm300 μm
Y=0.4
X+380 in air
< 30μm
Y=9.6
X in oxygen
30μ m168μm
Y=5.4
X+75 in oxygen
In the temperature range of thermal degradation (180°C600°C), the relation between the layer thickness of thermal oxidative degradation
Y (μm) and film thickness of TLEG
X (μm) is given by the following equations.
Film thickness Equation Atmospheres
< 70μm
Y=0.66
X in air
70μm168 μm
Y=0.28
X+42 in air
< 42μm
Y=0.80
X in oxygen
42μm95μm
Y=0.35
X+19 in oxygen
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