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采用DSC测试了聚ε-己内酯(PCL)的结晶温度(TC)和熔融温度(Tm)。同时采用偏光显微镜(POM)探讨了结晶时间的影响,发现结晶时间的改变只能够改变其晶体的尺寸,对其结晶形态并没有太大的影响。最后采用原子力显微镜(AFM)讨论了基底材料、溶剂和过冷度对PCL结晶形态的影响。结果表明:基底材料对PCL结晶形态的影响是比较显著的,PCL在硅片上呈棒状,在云母和涂有碳膜的云母上呈树枝状。溶剂对PCL结晶形态的影响明显,其结晶形态的差别与蒸汽压有关。在不同的温度下PCL结晶形态都成树枝状晶体,且分枝宽度随着过冷度的降低而增加。
The crystallization temperature (TC) and melting temperature (Tm) of poly-ε-caprolactone (PCL) were measured by DSC. At the same time, the influence of crystallization time by POM was explored, and it was found that the change of crystallization time could only change the size of its crystal, which did not affect its crystal morphology too much. Finally, atomic force microscopy (AFM) was used to discuss the effects of substrate materials, solvents and undercooling on the crystalline morphology of PCL. The results show that the influence of the substrate material on the crystal morphology of PCL is remarkable. The PCL is rod-shaped on the silicon wafer and dendritic on the mica and the carbon coated mica. The effect of solvent on PCL crystal morphology is obvious, the difference of crystal morphology is related to vapor pressure. The PCL crystallized into dendrite at different temperatures, and the branching width increased with the decrease of undercooling.