| Pure PET and PET/TiO2 nanocomposites were synthesized via the in situ method. The structures of PET and PET/TiO2 were studied by infrared spectroscopy, the results showed that the characteristic infrared of TiO2 appeared in the spectrogram, which showed that TiO2 linked into the macromolecule chains of PET.The photodegradation properties of PET/TiO2 and PET were studied. The samples after irradiation were characteristic by weight loss and SEM. The results showed that the weight loss (%) of PET/TiO2 was high than that of pure PET, and the SEM also showed that on the surface of the PET/TiO2 appeared more holes, while the surface of pure PET was also as smooth as before irradiation. All the phenomenon told us that the addition of the TiO2 promoted the photodegradation of PET.The effect of TiO2 particles on the non-isothermal crystallization behaviour of PET was investigated by differential scanning calorimetry (DSC). Three methods, namely, Avrami, Ozawa and Mo, were adopted to analyze the non-isothermal crystallization data. The results showed that the TiO2 in PET acted as effective nucleation agent, and PET/TiO2 crystallized at higher temperature because of the presence of TiO2. Also TiO2 accelerated the crystallization of PET, shorted crystallization time, and improved the degree of crystallization.TG thermal analyzer was used to examine the thermal degradation behaviors of PET and PET/ TiO2. The thermal degradation kinetics were analyzed by Friedman method and Ozawa method. The results showed that the thermal stability of PET/TiO2 nanocomposites was better than that of pure PET.The Combustion Properties of pure PET and PET/TiO2 composite were investigated by combustion. The results showed that the mass loss (%) and the heat release rate (HRR) of PET/TiO2 are all lower than those of pure PET. At the same time, The the total smoke production (TSP) and smoke production rate (SPR) of PET/TiO2 nanocoposites were a little lower than those of pure PET. All the phenomenon showed us that addition of TiO2 improved the flame retardation of PET. |
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