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以氧化铁包覆云母为成核剂,对聚对苯二甲酸乙二醇酯(PET)进行成核改性,采用差示扫描量热法分别研究了不同降温速率下PET和PET/氧化铁包覆云母复合材料的非等温结晶行为,用Jeziorny法和莫志深法对非等温结晶过程进行了分析,并用Flynn-Wall-Ozawa法计算其活化能。结果表明:氧化铁包覆云母对PET具有异相成核的作用,可明显提高PET的结晶速率;与Jeziorny法相比,莫志深法可较好描述PET和PET/氧化铁包覆云母复合材料的非等温结晶过程。进一步分析表明,氧化铁包覆云母的加入并没有明显改变PET基体的成核机理和生长方式,但降低了PET的结晶活化能,从而提高了PET的结晶性能。
The nucleation and modification of polyethylene terephthalate (PET) were carried out by using iron-coated mica as nucleating agent. The effects of different cooling rates on PET and PET / iron oxide were investigated by differential scanning calorimetry The non-isothermal crystallization behavior of coated mica composites was analyzed by Jeziorny’s method and Morozim’s method. The activation energy was calculated by the Flynn-Wall-Ozawa method. The results show that the mica coated with iron oxide has the effect of heterogeneous nucleation of PET, which can obviously improve the crystallization rate of PET. Compared with Jeziorny method, Mo Zhi deep method can describe PET and PET / iron oxide coated mica composite Non-isothermal crystallization process. Further analysis showed that the addition of ferric oxide coated mica did not significantly change the nucleation mechanism and growth mode of PET matrix, but reduced the crystallization activation energy of PET, thereby improving the crystallization performance of PET.