Thermogravimetric analysis crosslinking

The polymer has a crosslinked structure, and the curve showing the variation of weight loss % as a function of temperature (thermogravimetric analysis or TGA curve) is given in Figure 3.1.2. The sample was heated in N2 between 30° C and 830° C at a heating rate of 10° C/min. 

One unique characteristic of the borazine oligomer is that it has a very high mass yield observed upon conversion to BN. Figure 2.11 shows a thermogravimetric analysis (TGA) plot of the borazine oligomer. This data reveals that the mass yield upon conversion to BN is approximately 85% which is very high for a ceramic precursor [27]. Additional examination has revealed evidence for viscoplastic flow in the crosslinked oligomer under the application of pressure. This may increase the effective BN mass yield even further for a bulk structure such that the volume yield is between 60 and 70%. 

In the absence of other reactive groups, these react with one another by addition-type reaction to aflford crosslinked networks. Thermogravimetric analysis (TGA) showed that the thermal stability of the final networks with respect to the crosslinking groups decreases in the order [S50] ... 

The thermal stability of silicon mbber compounds was evaluated with thermogravimetric analysis (TGA). The decomposition temperatures of unfilled silicon mbber, silicon mbber/organo-MMT nanocomposite, and silicon mbber/ aerosilica filled compound were 381"C, 433"C, and 440"C, respectively, as shown in Fig. 12.5. This advantageous elevation in the decomposition temperatures of silicon mbber with organo-MMT or aerosiUea ineorporation ean be attributed to the favorable interaction between the silieon mbber matrix and filler particles, which increases the physical and chemical crosslinks which prevents the silicon chains from the degradation. It is also likely that these... 

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