To investigate the effect of ultrasonic treatment on the properties of sweet potato starch and sweet potato starch-based films, the complexing index, thermograms and diffractograms of the sweet potato starch-lauric acid composite were tested, and light transmission, microstructure, and mechanical and moisture barrier properties of the films were measured. The results indicated that the low power density ultrasound was beneficial to the formation of an inclusion complex. In thermograms, the gelatinization enthalpies of the ultrasonically treated starches were lower than those of the untreated sample. With the ultrasonic amplitude increased from 40% to 70%, the melting enthalpy (△H) of the inclusion complex gradually decreased. X-ray diffraction revealed that the diffraction intensity of the untreated samples was weaker than that of the ultrasonically treated samples. When the ultrasonic amplitude was above 40%, the diffraction intensity and relative crystallinity of inclusion complex gradually decreased. The scanning electronic microscope showed that the surface of the composite films became smooth after being treated by ultrasonication. Ultrasonication led to a reduction in film surface roughness under atomic force microscopy analysis. The films with ultrasonic treatment exhibited higher light transmission, lower elongation at break, higher tensile strength and better moisture barrier property than those without ultrasonic treatment.

为了研究超声处理对甘薯淀粉和甘薯淀粉基薄膜性能的影响，测试了甘薯淀粉-月桂酸复合物的配合指数，热谱图和衍射图，并测试了透光率，微观结构以及机械和机械性能。测量了膜的防潮性能。结果表明，低功率密度超声有利于包合物的形成。在热分析图中，超声处理过的淀粉的糊化焓低于未处理样品的糊化焓。随着超声振幅从40％增加到70％，夹杂物的熔化焓（△H）逐渐降低。X射线衍射显示未处理样品的衍射强度弱于超声处理样品的衍射强度。当超声振幅大于40％时，夹杂物的衍射强度和相对结晶度逐渐降低。扫描电子显微镜显示，复合膜的表面在经过超声处理后变得光滑。在原子力显微镜分析下，超声处理导致薄膜表面粗糙度的降低。与未进行超声处理的薄膜相比，经超声处理的薄膜具有更高的透光率，更低的断裂伸长率，更高的拉伸强度和更好的防潮性能。夹杂物的衍射强度和相对结晶度逐渐降低。扫描电子显微镜显示，复合膜的表面在经过超声处理后变得光滑。在原子力显微镜分析下，超声处理导致薄膜表面粗糙度的降低。与未进行超声处理的薄膜相比，经超声处理的薄膜具有更高的透光率，更低的断裂伸长率，更高的拉伸强度和更好的防潮性能。夹杂物的衍射强度和相对结晶度逐渐降低。扫描电子显微镜显示，复合膜的表面在经过超声处理后变得光滑。在原子力显微镜分析下，超声处理导致薄膜表面粗糙度的降低。与未进行超声处理的薄膜相比，经超声处理的薄膜具有更高的透光率，更低的断裂伸长率，更高的拉伸强度和更好的防潮性能。