Special materials for radar wave absorption (RWA) and stealth camouflage techniques are desired, because of their widespread applications in the military field. In this paper, silanized MoS2 (M/MoS2)/reduced graphene oxide (rGO) nanosheets were synthesized via ultrasonic and graft methods. The complex permittivity, Cole–Cole plots, and reflection loss (RL) curve and 3D RL plots indicate that the nanosheets have remarkable absorption properties. When the content of (M/MoS2)/rGO was 18 wt %, (M/MoS2)/rGO–wax composites exhibited an effective radar absorption bandwidth of 5.81 GHz at a thickness of 2.5 mm and a maximum RL of −49.7 dB. (M/MoS2)/rGO composites could be used as promising materials for RWA and broad absorption properties.

Castor oil-based waterborne polyurethane/silver-halloysite (WPU/Ag-HNT) antibacterial nanocomposites were prepared by incorporating silver-halloysite composite (Ag-HNT) into WPU via in situ polymerization. Ag-HNT was successfully synthesized by modification of halloysite nanotubes (HNTs) with 3-(2-Aminoethylamino) propyldimethoxymethylsilane (AEAPTMS) and chitosan, and then mixed with silver nitrate for combining silver ions, finally the silver nanoparticles were loaded on the surface of HNTs by reducing silver ions with NaBH4. The morphology, thermal properties and mechanical properties of WPU/Ag-HNT nanocomposites films were characterized by SEM, TGA, DMA, DSC and tensile testing. The results were shown that the thermal and mechanical properties of WPU/Ag-HNT nanocomposites were improved. The antibacterial test indicated that the nanocomposites exhibited excellent antibacterial activity against Staphylococcus aureus and Escherichia coli. The obtained nanocomposites will have promising applications in high performance antibacterial coatings.

Three kinds of nanoclays with different structure and morphology were modified by γ-aminopropyltriethoxysilane (APTES) and then incorporated into Jatropha oil-based waterborne polyurethane (WPU) matrix via in situ polymerization. The effects of surface structure and morphology of nanoclay on the degree of silylation were characterized by Fourier transform infrared spectroscopy (FTIR) and thermogravimetry analysis (TGA). The results showed that the montmorillonite (MT) with abundant hydroxyl group structure and platelet-like morphology had the highest degree of silylation, while the modified halloysite nanotubes (HT) had the lowest grafting ratio. The effects of different silylated clays on the properties of WPU/clay nanocomposites were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), TGA, dynamic thermomechanical analysis (DMA) and tensile testing machine. SEM images showed that all silylated clays had good compatibility with WPU and were uniformly dispersed into the polymer matrix. WPU/SMT exhibited the best thermal properties owing to its intercalated structure. Dynamic thermomechanical analysis (DMA), atomic force microscope (AFM), and water contact angle results demonstrated that the silylated nanoclays enhanced the degree of microphase separation, surface roughness, and hydrophobicity of WPU/clay nanocomposites.