Preparation Of Amido Molybdenum Disulfide And Its Application In Polymer Composites

In recent years, the composites are improved photochromic, electrical and thermal properties by adding multi-dimensional nanomaterials have been captured widely attention. Molybdenum disulfide (MoS2), a new two-dimensional(2D) nanomaterials was favorable in many potential applications of composites due to their unique anisotropic physical properties which derive from their ultrathin structure and quantum size effects. However, Molybdenum disulfide particles are not compatible with the polymer matrix, therefore, making use of the large specific surface area of molybdenum disulfide nanosheets to optimizing its dispersion in composites is the focus. Here, in order to improve the dispersion in polymer matrix, we exfoliated the molybdenum disulfide into nanosheets which was subsequently functionalized by cysteamine, and the functionalized molybdenum disulfide nanosheets grafted with poly(L-lactide), polyamide and epoxy. The main contents of this paper are as follows:1. Molybdenum disulfide was exfoliated by Li+ intercalation method, firstly. The exfoliated molybdenum disulfide was functionalized with cysteamine to obtain MoS2-NH2.The structure of MoS2-NH2 was characterized by XRD and XPS.2. The PLLA-g-MoS2 was synthesized via ring-opening polymerization using L-lactide initiated by MoS2-NH2 and characterized by FT-IR, XRD and XPS. The functionalized MoS2/poly(L-lactide) composites (MPLLA) were fabricated via a simple melt compounding method. The thermal and mechanical properties of MPLLA were proved by DSC, TGA and DMTA, which indicated that the thermal stability and mechanical property were improved apparently with the increasing of PLLA-g-MoS2.When the content of PLLA-g-MoS2 was 0.5wt%, both the thermal stability and mechanical property were best.3. The PA-g-MoS2 was synthesized via ring-opening polymerization using ε-caprolactam initiated by MoS2-NH2 and characterized by FT-IR, XRD and XPS. The functionalized MoS2/polyamide composites (MPA) were fabricated via a simple melt compounding method. The thermal and mechanical properties of MPA were proved by DSC,TGA and DMTA, which indicated that the thermal stability was improved apparently with the increasing of PA-g-MoS2, while the mechanical property was weaken with the existence of PA-g-MoS2.4. Epoxy resin composites obtained using 4,4’-Diamino diphenyl methane as curing agents and MoS2-NH2 as co-curing agents by in situ polymerization methods. The TGA, DSC and DMTA showed that thermal stabilities and mechanical properties of epoxy resin composites significantly improved compared to those of neat epoxy resin with the presence of MoS2-NH2.