多相体系中Ni-PMMA纳米复合材料的γ辐射制备  

γ-irradiation Preparation of Nickel-Poly(Methyl Methacrylate) Nanocomposites in a Heterogeneous System

作　　者：倪永红[1] 葛学武[1] 张志成[1] 朱志凌[1] 

机构地区：[1]中国科学技术大学高分子科学与工程系,合肥230026

出　　处：《Chinese Journal of Chemical Physics》2002年第5期393-395,共3页化学物理学报（英文）

摘　　要：在多相体系中 ,运用γ射线辐射法 ,在常温常压下成功地一步合成了镍 聚甲基丙烯酸甲酯 (Ni PMMA)纳米复合材料 .XRD、TEM分析和IR光谱表明 ,在此实验条件下 ,镍离子和甲基丙烯酸甲酯已成功地被还原或聚合 ,镍粒子为面心立方 ,尺寸为 7.33nm .研究显示 ,用醋酸钠代替氢氧化钠或氨水作为碱性试剂 ,可以有效地控制体系的pH ,同时不影响单体的聚合 .We report the preparation of nano-nickel particles embedded in poly(methyl methacrylate) matrix in situ by using radiation reduction of nickel ions and radiation induced polymerization of methyl methacrylate simultaneously with Co-60 γ-ray. The size, morphology and structure of the nickel-poly(methyl methacrylate) nanocomposites were investigated by X-ray powder diffraction(XRD) and transmission electron microscopy(TEM) analysis and IR spectrum. XRD pattern of nickel-poly(methyl methacrylate) shows that the products are face-centred cubic(fcc) crystalline nickel by the diffraction peaks with 2θ values of 44.3o and 52.3o, corresponding to the crystal faces of (111) and (200) of fcc crystalline nickel. According to Scherrer′s equation, the mean size of the nickel particles was calculated to be about 7.33 nm. From the IR spectrum of the nanocomposites, it can be seen that the double bond of methyl methacrylate dispeared after irradiation (1640 cm -1) and to be formed polymer. As seen from the TEM image of the sample, the nickel powders consisted of uniform size spherical particles, but small particles had aggregated into secondary particles due to their extremely small dimensions and high surface energy. Therefore, it was difficult to determine precisely the size and the size distribution of the nano-particles by simply viewing the TEM image. Sodium acetate was used as the basic agent, instead of NaOH or NH_3·H_2O. It can be used to control the pH value of the experimental solution, and does not affect the polymerization of methyl methacrylate. In summary, nickel-poly(methyl methacrylate) nanocomposites have been successfully prepared in one step by γ-irradiation in a heterogeneous system under ambient pressure at room temperature.

关 键 词：Ni-PMMA 制备 多相体系 γ射线辐射法 纳米复合材料 镍 聚甲基 丙烯酸 甲酯 聚合物 

分 类 号：TB332[一般工业技术—材料科学与工程]