纤维素芳族酯热致液晶对PET结晶成核作用的研究

Studies on Nucleation of Cellulose Aromatic Ester Thermotropic Liquid Crystal on Polyethylene Terephthalate

用自制的热致液晶性纤维素芳族酯（ＣＡＥ）作聚对苯二甲酸乙二醇酯（ＰＥＴ）的成核剂，研究了ＰＥＴ／ＣＡＥ体系（ＣＡＥ含量≤１％）在１１０～２００℃温度范围内的等温结晶动力学特性．结果表明，ＣＡＥ能显著加快ＰＥＴ结晶速率（Ｚ），Ｚ随结晶温度和ＣＡＥ含量变化均有极大值Ｚｍａｘ（ＴＣ）和Ｚｍａｘ（ＷＣＡＥ），Ｚｍａｘ（ＴＣ）对应的温度Ｔｍａｘ随ＣＡＥ含量增加而降低，ＣＡＥ促进ＰＥＴ结晶的作用机理与普通成核剂不同．

Using a self prepared cellulose aromatic ester(CAE) thermotropic liquid crystal as polyethylene terephthalate(PET) nucleating agent, the isothermal crystallizing kinetics characteristics of PET/CAE(CAE content≤1%) in the temperature range of 110￣200 ℃ were investigated. The results show that CAE can significantly accelerate crystallizing rate (Z) of PET, with the change of crystallizing temperature and CAE content, Z has a maximum value Z max ( T C) and Z max ( W CAE ), the temperature T max corresponding to Z max ( T C) decreases with the increase of CAE content. The mechanism of CAE accelerating PET crystallization is different from that of common nucleating agent.