不同型号PVA对纳米TiO2/PVA复合材料性能的影响
Effects of different types of PVA on the properties of the nano-TiO2/PVA composites
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摘要: 用硅烷偶联剂γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH550)对纳米TiO2进行改性, 将不同比例的聚乙烯醇(17-88与17-99)相混合制成胶液, 再采用直接共混法制备了纳米TiO2/聚乙烯醇(PVA)复合材料, 并流延成膜。通过自制透水仪、 扫描电镜、 热失重分析、 拉伸强度、 耐水性能以及透明性对纳米TiO2/PVA复合膜进行表征, 探讨不同含量的PVA 17-88对复合膜的性能影响。结果表明, PVA 17-88的质量分数为30%, 纳米TiO2 /PVA膜厚度控制在25~30 μm, 透水量较大, 拉伸强度达到28.72 MPa, 耐水性能最佳。Abstract: The modified nano-TiO2 by aminopropyl triethoxy silane(KH550) was used to prepare nano-TiO2/PVA composites through a solution casting method (PVA types: 17-88 and 17-99). The different contents of PVA 17-88 in nano-TiO2/PVA composites were characterized by TG analysis, and the structures of the composites were analyzed by SEM. The mechanical and water resistance and transparency of the composites were also characterized. The results show that when the mass fraction of PVA 17-88 is 30% and the thickness of membrane is controlled in 25~30 μm, the tensile strength is up to 28.72 MPa, the mass loss rate is the lowest.
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