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高分子薄膜已广泛地应用于工农业生产,成为人民生活中不可缺少的包装材料。而透明性又是包装薄膜的重要指标之一。高分子薄膜的透明性与薄膜的表面状态及内部结构有关。就结晶性高分子而言,结晶度、结晶尺寸、结晶取向、晶间距离都是影响透明性的因素。就复合膜而言,界面结构、折射率的差异对透明性的影响很大。为了提高高分子薄膜的透明性,可采取如下措施:①提高聚合物的冷却速度。在急冷的过程中,添加造核剂,减少聚合物的
Polymer film has been widely used in industrial and agricultural production, become indispensable to people’s lives in the packaging materials. Transparency and packaging film is one of the important indicators. The transparency of the polymer film and the film surface state and the internal structure. In the case of crystalline polymers, crystallinity, crystal size, crystal orientation, and distance between crystals are all factors that affect transparency. In the case of the composite film, the difference in refractive index between the interface structure and the refractive index has a great influence on the transparency. In order to improve the transparency of the polymer film, the following measures can be taken: ① improve the polymer cooling rate. During quench, add nucleating agent to reduce the polymer