【摘要】 用差示扫描量热法 (DSC) ,广角X射线衍射 (WAXD) ,傅立叶变换红外光谱 (FTIR)等技术研究了对苯二甲酸丁二酯 ε 己内酯 (PBT—PCL)多嵌段共聚物中硬链段的受限结晶。结果表明 ,PBT—PCL共聚酯中软硬链段在非晶区的混容性比较好 ,不同组成的样品均显示出一个玻璃化转变温度 ;对硬段含量超过 50 %的共聚酯来说 ,硬链段可以结晶 ,而软链段不能结晶 ;由于硬链段的受限特点 ,BT硬链段的结晶受软链段的影响和制约 ,其结晶能力随硬段序列长度的增加而逐渐增大。更多还原

【Abstract】 The confined crystallization of hard segments in butylene terephthalate ε caprolactone (PBT-PCL) copolyesters were carefully investigated by differential scanning calorimetry (DSC) and wide angle X-ray diffraction. Every copolyesters exhibits only one transition temperature T g . The uncrystallized hard and soft segments form a relatively compatible amorphous phase. For those copolyesters with hard segment content higher than 50%, the hard segments can crystallize, while the soft segments can not. The soft segments confine the crystallization of hard segments. The crystallizability of hard segments increases with increasing hard segment sequence length.更多还原