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研究了稀土催化体系对聚对苯二甲酸乙二酯固相缩聚反应的催化效果及对所得高分子量聚酯切片性能的影响。发现稀土催化体系可明显提高聚酯固相缩聚的反应速率。稀土催化体系对聚酯固相缩聚反应的催化活性明显高于传统催化体系 ,其中单一稀土催化体系与混合稀土催化体系在较低温度下具有相近的催化活性 ,而在较高温度下单一稀土催化体系的催化活性较高 ;加入稳定剂 ,不影响稀土催化的固相缩聚反应速率 ;稀土催化固相缩聚得到的PET样品具有较高的结晶度和较大的晶粒尺寸。其中单一稀土催化所得样品的晶粒尺寸最大 ,相应地 ,单一稀土催化的固相缩聚反应活化能也最大 ;稀土催化体系催化聚酯固相缩聚反应时添加适当稳定剂 ,可获得与采用传统催化体系得到的PET切片相近的热稳定性。
The catalytic effect of rare earth catalyst system on the solid state polycondensation of polyethylene terephthalate and the effect on the properties of high molecular weight polyester chips were studied. It is found that the rare earth catalyst system can obviously improve the reaction rate of polyester solid-state polycondensation. The catalytic activity of rare earth catalyst system for polyester solid state polycondensation reaction is obviously higher than that of the traditional catalytic system, in which the single rare earth catalyst system and the mixed rare earth catalyst system have similar catalytic activity at lower temperature, while under single temperature rare earth catalyst The catalytic activity of the system was high. Adding the stabilizer did not affect the rate of the solid-state polycondensation reaction catalyzed by rare earth. The PET samples obtained by the rare earth solid-phase polycondensation had higher crystallinity and larger grain size. Among them, the grain size of the samples obtained by a single rare earth catalysis is the largest, correspondingly, the activation energy of a single rare earth catalyzed solid phase polycondensation reaction is also the largest. When the rare earth catalyst catalysis polyester solid phase polycondensation reaction is added appropriate stabilizers, The thermal stability of PET slices obtained by the system is similar.