The inorganic–organic nanomaterials with high visible light transmittance have shown great potential in applications. However, it is difficult to disperse nanoparticles uniformly in organic matrices, resulting in an obvious decrease in transparency. This article reports a method to prepare ZnO-poly(methyl methacrylate) (ZnO-PMMA) nanocomposites with high transparency and excellent properties. First, a highly transparent nanodispersion of ZnO in methyl methacrylate (MMA) monomer is synthesized by the high-gravity reactive precipitation method. Then, ZnO-PMMA nanocomposites are prepared by the in situ bulk polymerization method. ZnO nanoparticles are about 6 nm with narrow size distribution, which monodisperse in MMA with the surface modifier containing C═C double bonds, contributing to the uniform dispersion of ZnO nanoparticles in PMMA matrices. Therefore, it ensures that the prepared ZnO-PMMA nanocomposites keep a high visible transmittance without any Rayleigh scatter. Moreover, ZnO-PMMA nanocomposites achieve multiple function applications of UV-shielding and anti-photo-aging, due to good thermal stability and high toughness and stiffness, which is attributed to the good dispersion of ZnO nanoparticles. After 200 h of UV radiation, pure PMMA obviously turns yellow and has a remarkable decrease in mechanical properties, whereas the nanocomposite is colorless and still keeps high visible transmittance and mechanical performances, which has great potential applications in the fields of optical materials and equipment.

中文翻译：

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可见光透明的单分散ZnO纳米粒子-聚（甲基丙烯酸甲酯）复合材料在紫外线屏蔽中的应用

具有高可见光透射率的无机-有机纳米材料已显示出巨大的应用潜力。然而，难以将纳米颗粒均匀地分散在有机基质中，导致透明性明显降低。本文报道了一种制备具有高透明性和优异性能的ZnO-聚甲基丙烯酸甲酯（ZnO-PMMA）纳米复合材料的方法。首先，通过高重力反应沉淀法合成了ZnO在甲基丙烯酸甲酯（MMA）单体中的高度透明的纳米分散体。然后，通过原位制备ZnO-PMMA纳米复合材料本体聚合法。ZnO纳米粒子约为6 nm，具有窄的尺寸分布，其在MMA中的单分散性与含有C═C双键的表面改性剂一起，有助于ZnO纳米粒子在PMMA基质中的均匀分散。因此，其确保了所制备的ZnO-PMMA纳米复合材料保持高可见光透射率而没有任何瑞利散射。此外，ZnO-PMMA纳米复合材料具有良好的热稳定性，高韧性和刚度，可实现紫外线屏蔽和抗光老化的多种功能，这归因于ZnO纳米颗粒的良好分散性。经过200 h的紫外线照射后，纯PMMA明显变成黄色，并且机械性能明显下降，而纳米复合材料是无色的，仍然保持较高的可见光透射率和机械性能，