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采用原位复合方法制备出纯PET、MWNTs-COOH/PET和MWNTs-OH/PET纳米复合材料。通过红外测试发现PET以共价键形式接枝到碳纳米管上;用扫描电镜(SEM)观察了改性碳纳米管在PET基体中的分散性;通过差示扫描量热法(DSC)研究3种纳米复合材料的非等温结晶行为,使用Jeziorny法和莫志深法分析3种样品的非等温结晶动力学。结果表明:COOH/OH官能化MWNTs可以较好地分散在PET基体中并且能够作为一种有效的成核剂,改变PET的成核机理;同时可以使PET在较高的温度下结晶,提高了PET的结晶速率并且MWNTs-COOH/PET复合材料起始结晶时间更早,而MWNTs-OH/PET复合材料结晶速率更快。
Pure PET, MWNTs-COOH / PET and MWNTs-OH / PET nanocomposites were prepared by in situ composite method. PET was covalently grafted onto carbon nanotubes by infrared spectroscopy. The dispersibility of modified carbon nanotubes (CNTs) in PET matrix was observed by scanning electron microscopy (SEM). The results of differential scanning calorimetry (DSC) The non-isothermal crystallization behavior of the three nanocomposites was investigated by using the Jeziorny method and the Moxie deep method for the non-isothermal crystallization kinetics of the three samples. The results show that the COOH / OH functionalized MWNTs can be well dispersed in the PET matrix and can act as an effective nucleating agent to change the nucleation mechanism of PET. At the same time, PET can be crystallized at a higher temperature, PET crystallization rate and MWNTs-COOH / PET composite initial crystallization time earlier, while the MWNTs-OH / PET composite crystallization rate faster.