关键词: 聚对苯二甲酸乙二酯, 纳米氧化锌, 复合材料, 结晶速率, 非等温结晶动力学

Abstract:

PET/ZnO nanocomposites were prepared through melt blending using polyethylene terephthalate （PET） and sodium oleate⁃modified nano⁃ZnO （4.73 nm） as raw materials for at nano⁃ZnO contents of 0， 0.02， 0.5， and 1.0 wt%. Differential scanning calorimetry was carried out to investigate the effect of cooling rate on the crystallization behavior of the nanocomposites. The results indicated that the crystallization temperature of PET/ZnO nanocomposites shifted to a low temperature， followed by a gradual increase in the width of crystallization peak， and their half crystallization time also tended to decrease with an increase in the cooling rate. In contrast pure PET， the crystallization ability and crystallization rate of the nanocomposites were improved at the same cooling rate with an increase in the nano⁃ZnO content. The non⁃isothermal crystallization kinetics was studied by the Jeziorny's method. The results indicated that the range of n value varied， indicating that the addition of nano⁃ZnO generated a certain effect on the original growing mode of PET. The crystallization rate constant （Z_c） increased with an increase in the nano⁃ZnO content. However， the Z_c value of the nanocomposites almost did not change at a nano⁃ZnO content of 1.0 wt%. The thermal stability and crystalline morphology of the nanocomposites were further analyzed by thermogravimetric analysis and hot⁃plate polarizing microscope. The results demonstrated that the incorporated nano⁃ZnO could act as a nucleating agent for the crystallization of PET， but it had little effect on the thermal stability of PET.

Key words: polyethylene terephthalate, nano-ZnO, nanocomposite, crystallization rate, non?isothermal crystallization kinetics