Preparation Of Styrene-Acrylic IPN/MMT Nanocomposite Damping Materials

This paper was aimed at preparing the materials of broad damping temperature range, high damping value, interpenetrating network structure with each other string of polymer/montmorillonite(MMT) nanocomposites. On the basis of the predecessors’ study, the montmorillonite, styrene, methyl methacrylate, methyl acrylate and butyl acrylate was used as raw materials, polystyrene-acrylate interpenetrating polymer network (IPN)/MMT nanocomposite damping materials was prepared in the emulsion system by in-situ intercalated polymerization.By means of X-ray diffraction(XRD), transmission electron microscopy (TEM), fourier transform infrared spectroscopy(FT-IR), dynamic mechanical spectrum(DMS) and other means of characterization, the influence of the content of emulsifier, the content of montmorillonite, emulsifying time, feeding methods, mixing rate, pH and other factors in the polymerization to monomer conversion rate, the degree of polymerization, the stripping extent of MMT, latex viscosity and the stability of polymerization was studied. The optimized methods and processes of polystyrene-acrylate IPN/MMT nanocomposite damping materials was ascertained. The principles of preparation of polystyrene-acrylate IPN/MMT nanocomposites was discussed.Experimental results show that in the emulsion system, using an inorganic montmorillonite directly with monomer in situ intercalative polymerization reactions, polystyrene-acrylate IPN /MMT nanocomposites with stripping structure of MMT can be prepared. The conversion rate of product was more than 96%, comparing with polystyrene-acrylate EPN materials, the domain of damping temperature (tanδ> 0.35) increased from(-13℃～19℃, 59℃～131℃) to(-24℃～140℃), the maximum of tanδincreased from 0.53 to 0.93. Its applied performance including storage stability, latex viscosity, hardness, water absorption capacity was better than the polystyrene-acrylate IPN materials.