*3.3. Weight Loss Study*

The variations in weight of the ACPU, ACPU/SiO2, and ACPU/SiO2-T coatings during the aging test are shown in Figure 6. Besides, as the reference, we added the weight changes of ACPU-T coating [3] into Figure 6.

As shown in Figure 6, the weight loss of all coatings increased by testing time. It reached the highest value for the neat coating and the coating containing light stabilizer had the smallest value of weight loss. Quantitatively, after 36 cycles, the remaining weights of the ACPU, ACPU/SiO2, and ACPU/SiO2-T coatings were 87.26%, 90.26%, and 97.8%, respectively. For comparative study, the weight loss in ACPU/SiO2-T coating was lower than that in ACPU-T coating.

**Figure 6.** Changes in weight of the coatings under accelerated weathering aging condition.
