聚合物存在下纳米银复合材料的制备与表征

以聚丙烯腈聚乙二醇嵌段共聚物PAN-b-PEG-b-PAN为稳定剂, 在超声辐照下成功地制备了分散性较好、尺寸均匀的纳米银颗粒. 用X射线衍射(XRD)、红外光谱(FTIR)、透射电镜(TEM)、紫外-可见吸收光谱(UV-Vis)和热分析(TGA)等对制备的纳米银复合材料进行了表征. 红外结果表明超声辐照并没有破坏聚合物的链结构. 聚合物的引入, 对纳米银颗粒起到了很好的分散保护作用. 用低浓度的硝酸银溶液, 得到粒径较小的纳米银颗粒; 随着硝酸银浓度增大, 纳米银颗粒粒径也增大. 而聚合物的浓度增大时, 所得银纳米颗粒粒径减小. 对银纳米颗粒的形成机理进行了讨论.

Preparation and Characterization of Silver Nanocomposites Based on Copolymers

Well-defined silver nanocomposites were prepared by using copolymer polyacrylonitrile-block-poly(ethylene glycol)-block-polyacrylonitrile (PAN-b-PEG-b-PAN) as stabilizer under ultrasonic irradiation. The product was characterized by X-ray diffraction (XRD), Fourier transfer infrared spectrometer (FTIR), transmission electron microscope(TEM), UV-Vis spectrum, and thermal gravity analysis (TGA). FTIR results revealed that the PEG backbone had not been destroyed after ultrasonic irradiation. Low initial silver ion concentration allowed for yielding silver nanoparticles with a small size and the size of the silver nanoparticles increased with the increasing of silver ion concentration. The size of the silver nanoparticles decreased with the increasing of the copolymers concentration. The mechanism of forming silver nanoparticles was discussed.