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γ-irradiation Preparation of Nickel-Poly(Methyl Methacrylate)Nanocomposites in a Heterogeneous System
Ni Yonghong,Ge Xuewu*,Zhang Zhicheng,Zhu Zhiling
Author NameAffiliationE-mail
Ni Yonghong Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026  
Ge Xuewu* Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026 xwge@ustc.edu.cn  
Zhang Zhicheng Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026  
Zhu Zhiling Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026  
Abstract:
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-60γ-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 2θvalues of 44.3oand 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 theTEM image. Sodium acetate was used as the basic agent, instead of NaOH or NH3·H2O. 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.
Key words:  The heterogeneous system,γ-ray irradiation, Nanocomposites
FundProject:
多相体系中Ni-PMMA纳米复合材料的γ辐射制备
倪永红,葛学武*,张志成,朱志凌
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7.33 nm.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.
关键词:  多相体系  γ射线辐射法  纳米复合材料
DOI:10.1088/1674-0068/15/5/393-395
分类号: