Branda Francesco, Passaro Jessica, Pauer Robin, Gaan Sabyasachi, Bifulco Aurelio
Department of Chemical Materials and Industrial Production Engineering (DICMaPI), University of Naples Federico II, 80125 Naples, Italy.
Advanced Materials and Surfaces Fibers, Empa Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Dubendorf, Switzerland.
Langmuir. 2022 May 10;38(18):5795-5802. doi: 10.1021/acs.langmuir.2c00377. Epub 2022 Apr 28.
Epoxy nanocomposites containing Mg(OH) nanocrystals (MgNCs, 5.3 wt %) were produced via an eco-friendly "solvent-free one-pot" process. X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and thermogravimetric analysis (TGA) confirm the presence of well-dispersed MgNCs. HRTEM reveals the presence also of multisheet-silica-based nanoparticles and a tendency of MgNCs to intergrow, leading to complex nanometric structures with an intersheet size of ∼0.43 nm, which is in agreement with the lattice spacing of the Mg(OH) (001) planes. The synthesis of MgNCs was designed on the basis of a mechanism initially proposed for the preparation of multisheet-silica-based/epoxy nanocomposites. The successful "in situ" generation of MgNCs in the epoxy via a "solvent-free one-pot" process confirms the validity of the earlier disclosed mechanism and thus opens up possibilities of new NCs with different fillers and polymer matrix. The condition would be the availability of a nanoparticle precursor soluble in the hydrophobic resin, giving the desired phase through hydrolysis and polycondensation.
通过一种环保的“无溶剂一锅法”制备了含有氢氧化镁纳米晶体（MgNCs，5.3重量%）的环氧纳米复合材料。X射线衍射（XRD）、高分辨率透射电子显微镜（HRTEM）和热重分析（TGA）证实了MgNCs的良好分散性。HRTEM还揭示了多片层二氧化硅基纳米颗粒的存在以及MgNCs的共生趋势，导致形成层间尺寸约为0.43nm的复杂纳米结构，这与氢氧化镁（001）平面的晶格间距一致。MgNCs的合成是基于最初提出的用于制备多片层二氧化硅基/环氧纳米复合材料的机理设计的。通过“无溶剂一锅法”在环氧树脂中成功“原位”生成MgNCs，证实了先前公开的机理的有效性，从而为具有不同填料和聚合物基体的新型纳米复合材料开辟了可能性。条件是要有可溶于疏水树脂的纳米颗粒前驱体，通过水解和缩聚产生所需的相。
