摘要:本文研究了凹凸棒土（AT），聚酯成核剂及成核剂A（癸二酸二苯甲酰肼）对聚对苯二甲酸乙二醇脂（PET）的结晶行为的影响。利用示扫描量热仪(DSC)研究PET/成核剂共混体系的非等温结晶、等温结晶行为。结果表明：加入三种成核剂后，PET的结晶行为有较大改善，热结晶峰向高温方向移动，结晶速率常数k增大，这说明成核剂都有效促进了PET的结晶，而且PET/成核剂A复合材料的结晶度是最大的。PET等温结晶时，温度对PET的结晶行为也有较大影响。等温结晶温度越高，结晶速率常数k越小，PET成核速率就越慢，PET达到100%相对结晶度所用时间就越长。PET、PET复合材料在同一温度结晶时，复合材料的结晶速率常数k都比PET大，说明成核剂A促进了PET的结晶。
关键词：PET；成核剂；DSC；结晶动力学
Abstract：The effect of nucleating agents such as AT, polyester nucleation agent, nucleation agent A on the crystallization behaviors,crystallization kinetics of polyethylene terephthalate ( PET ) was studied . Differential scanning calorimetry(DSC) was used to study the non isothermal crystallization kinetics and isothermal crystallization kinetics of PET/ nucleating agent. The results show that the crystallization behavior of PET have been greater improved, thermal crystallization peak moved to higher temperature and crystallization rate constant K of PET increases to a certain extent by added three nucleation agents,and nucleating agent can effectively promoted the crystallization of PET.And the crystallinity of PET/ nucleating agent A composite is the largest.Isothermal crystallization temperature has a great influence of PET crystal. isothermal crystallization temperature is the higher, The higher the crystallization temperature, crystallization rate constant k is smaller and nucleation rates of PET is slower, when crystallization of PET achieved 100% relative crystallinity the time is longer. At the same temperature,composite crystalline rate constant k is greater than PET,so nucleating agent can effectively promoted the crystallization of PET.
Key words: PET ; nucleation agent ; DSC ; crystallization kinetics
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