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研究了纳米TiO2 含量、EVA蜡对纳米TiO2 /HIPS体系的流变性能影响 ,以原子力显微镜表征样品表面质量及母料分散性 ,以UV Vis表征样品表面的吸收谱图。结果表明复合体系的表观粘度受纳米TiO2 含量的影响较小 ,在低含量的情况下 ,复合体系的表观粘度优于纯HIPS。EVA蜡可以在较大范围内调整复合体系的流变性能 ,在流动过程中 ,复合体系内纳米TiO2 聚集结构可以被逐步破坏 ,从而使纳米TiO2 得到良好分散。原子力显微镜测试表明 ,采用 6份以上EVA蜡改性的纳米TiO2 /HIPS体系做母料 ,可得到表观及分散性良好的制品。低纳米TiO2 含量HIPS制品依然呈现纳米TiO2 本体的光学吸收特性 ,其表面对可见光仍有较强的反射能力 ,而对紫外光却有较强的吸收能力
The effects of nano-TiO2 content and rheological properties of nano-TiO2 / HIPS were studied. Atomic force microscopy was used to characterize the surface quality and the dispersibility of the masterbatch. UV absorption spectrum was used to characterize the absorption spectrum of the sample. The results show that the apparent viscosity of the composite system is less affected by the content of nano-TiO2. At low content, the apparent viscosity of the composite system is better than pure HIPS. EVA wax can adjust the rheological properties of the composite system in a wide range. During the flowing process, the nano-TiO2 aggregation structure in the composite system can be gradually destroyed, so that the nano-TiO2 can be well dispersed. Atomic force microscopy tests show that the use of more than 6 parts EVA wax modified nano-TiO2 / HIPS system as a masterbatch can be obtained with good apparent and decentralized products. Low content of nano-TiO2 HIPS products still exhibit nano-TiO2 body optical absorption properties, the surface of the visible light is still strong reflection ability, but has strong absorption of ultraviolet light