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通过高温溶剂法制备了油酸包覆的Li3PO4纳米晶,经过聚乙二醇单油酸酯再修饰,分散于甲基丙烯酸甲酯单体中,通过原位紫外光引发本体聚合,得到了块体的Li3PO4/PMMA纳米复合材料.XRD谱显示所制备的Li3PO4纳米晶为纯的单斜相,而复合材料的XRD谱中含有Li3PO4的相,表明Li3PO4纳米晶已成功复合进PMMA中,Li3PO4的TEM显示其粒径较为均一,约为10 nm,且在环己烷中无明显的团聚.复合材料超薄切片的TEM表明,Li3PO4纳米晶以50 nm左右的团簇分散于聚合物基质中.FTIR测试表明制备的Li3PO4纳米晶被油酸包覆.UV-Vis显示当所制备的复合材料固含量达14.6 wt%仍然保持很高的透过率,TGA分析表明纳米粉的掺入使复合材料的分解温度提高了95℃.制备的Li3PO4/PMMA纳米复合材料有望应用于热中子的探测.
Oleic acid-coated Li3PO4 nanocrystals were prepared by high temperature solvent method, and then modified with polyethylene glycol monooleate to disperse in methyl methacrylate monomer. The bulk polymerization was initiated by in-situ UV light to obtain block XRD patterns show that the prepared Li3PO4 nanocrystals are pure monoclinic phase, while the XRD spectrum of the composite contains Li3PO4 phase, indicating that the Li3PO4 nanocrystals have been successfully incorporated into the PMMA. The Li3PO4 The TEM shows that the particle size is relatively uniform, about 10 nm, and there is no obvious agglomeration in cyclohexane.The TEM of ultrathin sections of the composite shows that the Li3PO4 nanocrystals are dispersed in the polymer matrix with about 50 nm clusters. FTIR tests showed that the prepared Li3PO4 nanocrystals were coated with oleic acid.UV-Vis showed that when the solid content of the prepared composite reached 14.6 wt%, the transmittance remained high, TGA analysis showed that the incorporation of nano-powders Decomposition temperature increased by 95 ℃ .The preparation of Li3PO4 / PMMA nanocomposites is expected to be applied to the detection of thermal neutrons.