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Abstract
Nanocomposites composed of SiO2 nanoparticles and a poly(butylene terephthalate) (PBT)/poly(ethylene terephthalate) (PET) binary blend were prepared by melt blending in a twin-screw extruder. The phase morphology, crystallization behavior, and transesterification of the nanocomposites were investigated by field emission scanning electron microscopy (FE-SEM), differential scanning calorimetry (DSC), nuclear magnetic resonance (NMR) spectroscopy, etc. The effects of microstructure and interfacial reaction on the mechanical and thermal properties of the nanocomposites are discussed in detail. Owing to the excellent dispersion of SiO2 nanoparticles in the PBT/PET matrix, the transesterification between PBT and PET was inhibited and the melting point was increased in the presence of SiO2 nanoparticles. SiO2 nanoparticles in PBT/PET/SiO2–1, produced by a one-step method, had a more effective inhibition of transesterification between PBT and PET than that in PBT/PET/SiO2–2 produced by a master batch method, with the former exhibiting the best properties.
Acknowledgments
This work was supported by the National Natural Science Foundation of China (20925621, 50703009), the Special Projects for Nanotechnology of Shanghai (0952nm02000, 0952nm02100), the Basic Research Program of Shanghai (10JC1403600), the Shanghai Pujiang Program (09PJ1403200), and the Fundamental Research Funds for the Central Universities (WD0914022).
