采用溶液共混的方法制备了一系列聚己内酯(PCL)与醋酸丙酸纤维素(CAP)的共混薄膜.DMA显示共混物中二者的玻璃化转变温度互相靠近,表明二者之间有一定的相容性.X射线衍射表明,CAP对PCL的结晶有一定的抑制作用,但对其特征晶体结构并无改变.透射电镜下可发现共混物中CAP的相区尺寸减小,形态及排列均未受影响.热重分析表明PCL的加入改善了混合物的热解稳定性.拉伸试验说明与PCL的共混可以在不过多降低拉伸强度的情况下大幅提高断裂伸长率.
Cellulose acetate propionate (CAP)/polycaprolactone (PCL) blends with various blend ratios were prepared via solution mixing and film casting. The structure and properties of the materials were investigated by dynamic mechanical thermal analysis (DMA), X-ray diffraction, transmission electron microscope, thermo-gravimetric analysis and tensile testing. The DMA results indicate that CAP was relatively compatible with PCL. XRD result shows that CAP reduces the crystallinity of PCL in the blends and has no significant impact on the structure of crystalline. The incorporation of PCL shrinks the dimension of CAP-rich phase and improves both of thermal decomposition stability and elongation of blends.
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