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Figure 3. Differential thermogravimetric studies of thermoplastic elastomer with the 
composition of VPE: HSPE: 
№1. 1. VPE: XSPE - (70:30) №2 . VPE: XSPE - (50:50) №3 . WPE: HSPE - (30:70) 
 
On the figure. 3. It can be seen that the introduction of magnesium oxide into CSPE 
increases the temperature of the onset of decomposition to 160 ° C, which makes it possible to 
expand the temperature range of processing of mixed TPEs. In addition, with the introduction of 
magnesium oxide into CSPE, the temperature increases with the same loss of polymer weight by 
10% (T10). In this case, the destructive nature of CSPE does not change, which shows the effect 
of magnesium oxide as an acceptor of hydrogen chloride. Figure 3 shows that the process of 
decomposition of mixed TPEs based on VPE-CSPE is mainly determined by the polymer that 
makes up the greater amount in the composition. 
Table-2.
 
TGA results for mixed TPEs based on HPE and HSPE.
Composition 
Т
initial, 
°С 
Т
10, 
°С 
Т
50, 
°С 
WPE 
270 
350 
460 
KHSPE 
150 
220 
380 
KHSPE + 5m.h. MgO 
160 
260 
410 
WPE: HSPE (20:80) 
160 
280 
400 
WPE: HSPE (50:50) 
160 
260 
410 
WPE: HSPE (30:70) 
160 
280 
440 

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453 
In this case, the temperature range of the onset of decomposition should correspond to the 
less thermostable polymer in the TPE composition. The corresponding temperatures with a loss of 
10% (T10) and 50% (T50) of the initial mass of the blended TPEs are in the temperature range of 
the values of the initial polymers. However, TPEs based on CSPE have a higher temperature T10 
in comparison with the initial polymer (Table 2), which is not typical for similar materials. All this 
can be explained by connections with the nature of the components and the peculiarities of 
obtaining the composition. Thus, the partial dehydrochlorination of CSPE occurs in the process of 
high-temperature mixing, which leads to the structure formation of the polymer matrix. In this 
temperature range, unstable chlorine atoms in the macromolecule are split off, which in turn 
improves the structure formation of the polymer. Proceeding from this, the increase in the thermal 
stability of the obtained compositions is quite understandable. Thus, obtaining TPEs based on VPE 
and CSPE in the dynamic mixing mode makes it possible to obtain compositions with high thermal 
stability compared to the initial polymers.