Poly (butylene succinate) (PBS, AZ91TN) used in this study (standard extrusion for film grade) was purchased
from BC Polymers Marketing (Thailand) Co., Ltd. Poly(ethylene terephthalate) (PET) of commercial grade was
purchased from Pacific Color Co., Ltd. Structures of PET and PBS are shown in Table 1. TiO2 and ZnO were
purchased from N.P. Science Co., Ltd.