PBT/PET共混体系的晶区的相容性及形态结构

MISCIBILITY AND MORPHOLOGY IN THE CRYSTALLINE PHASE OF POLY(ETHYLENETEREPHTHALATE) AND POLY(BUTYLENETERPHTHALATE) BLENDS

用广角Ｘ射线衍射法（ＷＡＸＤ）、差示扫描量热法（ＤＳＣ）以及红外光谱法（ＩＲ）等方法证明了在聚对苯二甲酸丁二酯（ＰＢＴ）／聚对苯二甲酸乙二酯（ＰＥＴ）共混体系中两组分是晶相分离的，而不生成混晶。动态力学分析结果表明，ＰＢＴ、ＰＥＴ两组分晶区之间的无定型部分仍具有相容性，共混体系的形态结构因组分比不同而变化。长周期Ｌ、无定形区厚度Ａ以及晶区厚度Ｃ均随ＰＢＴ含量的增加而减小。结晶温度升高，有利于晶区厚度增大。

A lot of method, such as : DSC, WAXD,IR, SAXS, DMA, etc. have been utilized to determine the miscibility and morphology of PBT/PET blends. The results indicated that PBT and PET crystallized according to their own cell unit, amorphous phase between crystallization phase are miscible. The morphology of the blends changes with compositions. Long spacing, crystallize core thickness and amorphous thickness decrease with increasing PBT. Crystallize core thickness will increase at higher temperatures.