丙纶表面沉积纳米薄膜的原子力显微镜分析

Characterization of functional nanostructures on polypropylene fibers by atomic force microscope

采用低温磁控溅射技术在丙纶(熔喷法非织造布)表面沉积铝、氧化锌和聚四氟乙烯纳米薄膜,用原子力显微镜观察纤维基材及三种纳米薄膜沉积在纤维表面的微观结构,为进一步对聚合物纤维材料磁控溅射功能化加工的工艺参数优化调整,以及对沉积材料在纤维表面的结合机理的研究提供理论依据。通过对原子力显微镜图像分析发现,丙纶(熔喷法非织造布)表面比较平滑,而丙纶长丝的表面则成一定的周期性条纹状结构;低温磁控溅射技术在丙纶(熔喷法非织造布)表面构建的功能性纳米薄膜随着沉积材料的不同,其在纤维表面的聚集形态不同。铝和氧化锌在纤维表面形成纳米颗粒状结构,而高分子材料聚四氟乙烯则形成纳米条带状形貌。分析和测量了金属颗粒和聚四氟乙烯条带的尺寸。

Magnetron sputter coating was employed in this study to deposit aluminum, zinc oxide and polytetrafluoroethylene （PTFE） on the surface of melt blown polypropylene （PP） fibers at low temperature. Atomic force microscopy （AFM） was applied to examine the surface structures of the original melt blown PP fibers and the fiber coated with different materials in order to obtain some useful information for the adjustment of the technical parameters of the sputter coating and the adhesion mechanism between the fibers and the coated layer. AFM observations revealed that the surface morphology of the meltblown PP fibers was different from that of spun PP fibers. It was also found from the AFM examination that the sputter coating significantly altered the surface morphology of the meltblown PP fibers. The sputter coatings with aluminum and zinc oxide formed nanoclusters on the fiber surface. The sizes of the metal nanoclusters were analyzed using the image anlysis. The sputter coating with PTFE generated nanosized ribbons on the fiber surface. The sizes of the PTFE nano-ribbons were also measured based on the AFM images.