PET／PHB共聚酯的液晶性及相转变的研究

Study on The Liquid Crystalline Properties and Phase Transition of PET/PHB Copolyesters

本文用偏光显微镜、红外光谱（ＦＴＩＲ）、示差扫描量热仪（ＤＳＣ）等先进仪器研究了各种组成的ＰＥＴ／ＰＨＢ共聚酯的液晶性能及热转变特性。研究结果表明，当ＰＨＢ％大于３０ｍｏｌ％时开始出现向列型热致液晶性。共聚脂均表现出多重相转变特征，这与不同程度的ＰＥＴ富微区和ＰＨＢ富微区有关。

The liquid crystalline properties and phase transitions of PET/PHB copolyesters are studied by polarizing light microscope,infrared spectroscopy(IR)and differential scanning calorimeter(DSC).Copolyesters show nematic thermotropic liquid crystalline behaviour when PHB content is over 30 mole percent.Clearly thread-schlieren texture is remakable when PHB content varies from 50 to 70mole percent. There are many-stage phase transitions associated with PET-rich domain and PHB-rich domain in copolyesters.