To study the waterproof of coating materials, a series of waterborne polyurethanes were prepared with different kinds and molecular weight of polyols. IR spectroscopy was used to check the end of polymerization reaction and characterization of polymer. The study was carried out by increasing the waterproof of various coating agents through variations of soft segments. We introduced laser-scattering equipment, Brookfield digital viscometer, JC2000C instrument, scanning electron microscope (SEM), and atomic force microscope (AFM) to investigate the particle size, viscosity, contact angle, and morphology of the coated fabric. In short, results displayed waterproof as follows: 3146~8200 mm H2O (IPDI = 30 %) in various polyols and 5421~8748 mm H2O (R = 1.6) of different molecular weight of poly(butylene adipate) (PBA). The higher water resistance belonged to PTMG-WBPU and WBPU-1000, respectively. Experimental results indicated that water resistance may be controlled by not only the types of soft segments, but also the molecular weight.

•Uniform CoS nanomaterials dispersed on RGO sheets have been fabricated successfully.•CRs, initially used as EM absorbers, exhibit remarkable EM absorption performance.•A feasible strategy for synthesizing metal sulfides/RGO nanocomposites was provided.CoS nanoparticles anchored on reduced graphene oxide sheets (CRs), synthesized via a facile solvothermal approach, are initially investigated as microwave absorbers. Such nanoarchitecture is significantly different from CoS microspheres (CMs) prepared in the absence of graphene oxide under similar preparation conditions. Moreover, the influence of loading concentration, layer thickness and CoS amount on the microwave absorption performance was systematically studied. In this study, with a thin filler loading of 20 wt% in paraffin matrix, CRs exhibited an effective microwave absorption bandwidth of 4.0 GHz at the thickness of 2.0 mm and an optimal reflection loss value of −54.2 dB at 6.8 GHz with the thicknesses of 4.0 mm. Furthermore, an effective absorption bandwidth (reflection loss below −10 dB) of 13.6 GHz (4.4–18.0 GHz) could be achieved via adjusting the thicknesses from 1.5 to 5.0 mm. The results indicated that CRs nanomaterials would be intriguing candidate as advanced microwave absorber. Meanwhile, we also provided a feasible strategy for construction of such metal-sulfides/RGO nanocomposites for a wide range of applications, such as Li-ion batteries, supercapacitors, and microwave absorbers.