天然石榴皮色素／PBS着色膜的性能

Property of Natural Pigments from Pomegranate Rind/PBS Coloring Film

采用溶剂萃取法从石榴皮中提取天然色素,将其机械搅拌混入可生物降解材料聚丁二酸丁二醇酯(PBS)中着色。采用偏光显微镜观察各种着色膜表面色素的分散情况;利用X射线衍射(WAXD)分析着色膜的结晶度;并测定着色膜的力学性能和热稳定性。研究结果表明:天然色素在塑料薄膜中分散性好,且色素的添加对PBS结晶度影响不大。随着色素量的增加,着色膜的拉伸强度增大,而断裂伸长率呈上升趋势,但其小于纯PBS膜的。超过9%的色素添加量使着色膜的热稳定性略微下降。

The natural pigment was extracted by solvent extraction from pomegranate rind,and mixed with the polybutylene succinate （PBS） in the coloring by mechanical mixing. Polarized light microscopy was used to observe pigment dispersion of the membrane surface of the coloring film X-ray diffraction （WAXD） was used to analysis its crystallinity and the mechanical properties and thermal stability were determinated. The results showed that the natural pigment could be well dispersed in the plastic film,and the pigment had little effect on the crystallinity of PBS. With the increasing of pigment, the tensile strength increased and the elongation at break had an upward trend, but less than pure PBS film. The thermal stability of composite decreased slightly when the pigment was added more than 9 %.