TG-DSC curve

Kodama and co-workers [58] have reported TG-DSC curves for the analysis of the interaction between vulcanisation accelerators (tetramethylthiuram disulphide, dibenzothiazolyl disulphide, diphenylguanidine and N-cyclohexyl-2-benzothiazolyl-sulphenamide) and fillers (carbon black, white carbon, hard clay and CaC03). The initial melting point (MP) of the accelerators was largely influenced by the fillers. The higher the surface activity of the filler is, the lower and wider the melting range becomes. 

The TG-DSC curves were measured on a Netzsch 409 EP Simultaneous Thermal Analysis device, using 20 mg of powdered sample. To analyse the effect of heat treatment of the samples, the experiments were carried out heating in air at a rate of 5 °C min, from ambient to lOOOT, using a-alumina as a reference. 

Figure 3.15 The TG-DSC curves of the reactants with the weight ratio as the typicai procedure. (Reproduced with permission from Ref. [7d]. Copyright 2013, Eisevier Limited.)...

TG-DSC curves recorded in the presence of oxygen showed the absence of the step II for all the investigated catalysts. The second step, which now corresponds to NOx species accumulation, occurs also more rapidly The differences between the various Cu-ZSM-5 catalysts become very small. The addition of a second species limits in a very small extent this process and only if the second species exists in a small amount as in the case of Cu-Sm-Z-96-19 2. Both first and second are characterized... 

Previous studies showed that NO decomposition on Cu-ZSM-5 activated in He reaches the steady-state regime only after minimum two hours [10], The activation in air of these catalysts reduces this time but the activity of the catalysts is lower than those of activated in He. TG-DSC curves combined with XPS data showed that this preliminary stage consists of two steps, one representing the oxidation of copper and another consisting in some superficial rearrangements of copper. ki and the mass constant time in TG-DSC curves give a measure of these processes. 

The kinetic analysis of TG-DSC curves recorded in the presence of NO leads to kinetic parameters, which characterize the deactivation of the catalysts. From the same analysis other parameters like oxidation of copper or its superficial migration may also be determined. 

Figure 4.102 TG-DSC curves for thermal decomposition of silicone rubber. Sample mass, 15 mg heating rate, 10 °C min atmosphere, air flow-rate, 200 ml min .

Figure 5.27 TG-DSC curves for flame-retarded wood in air. Solid line, fibreboard dashed line, fibreboard treated with flame retardant...

Weigh a sample of about 2 mg. Place it in a simultaneous TG-DSC system, then choose appropriate test conditions. Figure 5.27 shows TG-DSC curves recorded in a static air atmosphere at a heating rate of 10 °C min ", with conditions of 10 mg for TG and 40 mj s for DSC. The same set of experiments should be conducted under the same conditions for the purpose of comparison. 

Figure 12. Simultaneous TG-DSC curves for an uncured polyimide resin...

Fig. 2. TG-DSC curves of a- and /6-CDs, and their inclusion complexes with styrene.

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