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采用差示扫描量热法(DSC)研究了2-甲基-1,3-丙二醇(MPO)改性共聚酯的非等温结晶行为。研究结果表明:MPO的加入使聚对苯二甲酸乙二醇酯(PET)结晶温度降低,半结晶时间(t_(1/2))延长;采用Jeziorny法分析了此体系的非等温结晶行为,发现结晶速率常数(Z_c)随MPO的加入而减小,表明MPO的加入降低了PET的结晶能力,此改性共聚酯将在瓶材和板材方面有更为广阔的应用前景。
The non-isothermal crystallization behavior of 2-methyl-1,3-propanediol (MPO) modified copolyester was studied by differential scanning calorimetry (DSC). The results show that the crystallization temperature of polyethylene terephthalate (PET) decreases and the half crystallization time (t 1/2) increases with the addition of MPO. The non-isothermal crystallization behavior of the system is analyzed by Jeziorny method. It is found that the crystallization rate constant (Z_c) decreases with the addition of MPO, indicating that the addition of MPO reduces the crystallization ability of PET. The modified copolyester will have a broader application prospect in bottle and plate.