利用原子力显微镜(AFM)研究了不同温度的聚氧乙烯(PEO)超薄膜等温结晶过程。结果表明:超薄膜晶体形貌具有生长控制因素的依赖性;当晶体生长同时受到表面成核和熔体扩散控制时,各方向生长速率明显不同,且在晶体形成过程中,先发生液相-固相转变,后发生固相-固相转变。 Atomic force microscopy (AFM) was used to study the isothermal crystallization of poly (ethylene oxide) (PEO) films at different temperatures. The results show that the crystal morphology of the ultrathin films is dependent on the growth controlling factors. When the crystal growth is controlled by both surface nucleation and melt diffusion, the growth rates in all directions are obviously different. In the process of crystal formation, Solid-state transition, followed by solid-solid phase transition.