Hunan Key Laboratory of Biomass Fiber Functional Materials, Hunan Key Laboratory of Comprehensive Utilization of Agricultural and Animal Husbandry Waste Resources, Hunan International Scientific and Technological Innovation Cooperation Base of Biomass Fiber Materials and Application, Hunan University of Technology, Zhuzhou 412007, China; National and Local Joint Engineering Research Center of Advanced Packaging Materials Research and Development Technology, Hunan Key Laboratory of Advanced Packaging Materials and Technology, School of Packaging and Material Engineering, Hunan University of Technology, Zhuzhou 412007, China; Powder Metallurgy Research Institute, Central South University, Changsha 410006, China. Electronic address: [Email]
Because of the poor performance of starch-based composites, we prepared the starch-based composites with good mechanical properties by a simple two-step melt-blending extrusion. Glycerol and nano-SiO2 were firstly introduced into starch to prepare the TPS/nano-SiO2 composite by the first extrusion, and poly(butylene adipate-co-terephthalate) (PBAT) and the compatibilizers were then incorporated to obtain the improved composites by the second extrusion. The mechanical properties, thermal properties, morphology, and structure of the composites were characterized. The results showed that the strength dramatically increased after the addition of nano-SiO2 into starch, and the elongation at break was significantly improved by the incorporation of PBAT. The tensile strength was increased distinctly after the addition of the compatibilizers. All the composites exhibited good mechanical properties. The melting transition, the thermal stability, and the crystalline structure did not change with the additives, whereas the glass transition of the starch-rich phase shifted to a lower temperature. The results indicated that the combined compatibilizers had better compatibilization than each one alone.