Waterborne polyurethane/Fe3O4-synthetic talc composites: synthesis, characterization, and magnetic properties
Waterborne polyurethane/Fe3O4-synthetic talc composites: synthesis, characterization, and magnetic properties
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DOI：
10.1007/s00289-017-2133-9
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发表时间：
2018-05
期刊：
影响因子：
3.2
通讯作者：
L. D. Dos Santos;R. Ligabue;A. Dumas;C. Le Roux;P. Micoud;J. Meunier;F. Martin;M. Corvo;P. Almeida;S. Einloft
中科院分区：
文献类型：
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作者：
L. D. Dos Santos;R. Ligabue;A. Dumas;C. Le Roux;P. Micoud;J. Meunier;F. Martin;M. Corvo;P. Almeida;S. Einloft
以纳米Fe3O4合成滑石凝胶为填充剂，合成了水性聚氨酯/Fe3O4合成滑石纳米复合材料。这种填料具有大量的边(Si-O和Mg-O)和容易形成氢键和极性相互作用的羟基，具有亲水特性，因此改善了填料在水基基质中的分散性。然而，水性聚氨酯(WPU)作为基质的使用必须受到重视，因为它具有环境友好的特点，与溶剂型产品相比毒性低。X射线衍射仪和透射电子显微镜分析表明，即使在高填充量的情况下，Fe3O4合成的滑石纳米填料也能很好地分散到聚氨酯中。核磁共振表明填充剂羟基与基质的相互作用。对于所有的纳米复合材料，在居里温度(约120K)以下可以看到典型的铁磁行为，在这个温度以上可以看到超顺磁性行为。使用Fe3O4合成滑石制备磁性纳米复合材料，可以得到比溶剂型纳米复合材料更好的材料，具有更好的力学性能。
Nano-Fe3O4-synthetic talc gel was used as filler in the synthesis of waterborne polyurethane/Fe3O4-synthetic talc nanocomposites. This filler presents numerous edges (Si–O and Mg–O) and OH groups easily forming hydrogen bonds and polar interaction with water conferring hydrophilic character, consequently improving filler dispersion within a water-based matrix. Yet, the use of waterborne polyurethane (WPU) as matrix must be highlighted due to its environmentally friendly characteristics and low toxicity compared to solvent-based product. Fe3O4-synthetic talc-nanofillers were well dispersed into the polyurethane matrix even at high filler content as supported by XRD and TEM analyses. NMR indicates the interaction of filler OH groups with the matrix. For all nanocomposites, one can see a typical ferromagnetic behavior below Curie temperature (about 120 K) and a superparamagnetic behavior above this temperature. The use of Fe3O4-synthetic talc for obtaining magnetic nanocomposites resulted in improved materials with superior mechanical properties compared to solvent-based nanocomposites.