*3.2. Thermal Stability*

The thermal stability of PBAT/Ti3C2TX nanocomposites is shown in Figure 2, and the corresponding data, including the temperatures at 10% weight loss (*T*10), the temperatures at the maximum weight loss rate (*T*max), and the char yields at 600 ◦C, are listed in Table 1. In Figure 2a, two thermal decomposition stages are observable for all the samples. The first stage between 300 ◦C and 420 ◦C can be attributed to the random, main-chain scission and thermo-oxidative reactions of PBAT [38]. The second stage, in the range of 420–550 ◦C, corresponds to cis-elimination and thermo-oxidative reactions [32]. In Table 1, it can be seen that the values of *T*<sup>10</sup> showed an increasing trend with the increase of Ti3C2TX content. When compared to PBAT-0, the *T*<sup>10</sup> of PBAT-2.0 dropped from 373.5 ◦C to 379.2 ◦C. In addition, the *T*<sup>p</sup> of PBAT-2.0 gradually increased to 412.5 ◦C with the addition of 2 wt% Ti3C2TX. That is because the presence of Ti3C2TX rapidly catalyzed the formation of a char layer that served as a thermal barrier to protect the underlying polymer matrices [39]. The improvement of char yield benefited from the isolating of volatile gases and oxygen; therefore, improving the thermal stability of PBAT. Furthermore, the char yield at 600 ◦C for PBAT-0, PBAT-0.5, PBAT-1.0, and PBAT-2.0 was 0.7%, 1.0%, 1.4%, and 1.7%, respectively. It was mainly due to the introduction of Ti3C2TX, which promoted charring, and partial polymers could not be completely thermally decomposed, resulting in enhanced char residues [40].

**Figure 2.** TGA curves of PBAT/Ti3C2TX nanocomposites at air atmospheres. (**a**) TGA and (**b**) DTG. **Table 1.** Thermal stability of PBAT/Ti3C2TX nanocomposite films.

