Preparation Of Antistatic Polystyrene Superfine Poeder With Modified Carbon Nanotubes As Antistatic Agent

This paper mainly studies the preparation of antistatic polystyrene (PS) superfine powder used in 3D print. The particularity structure of carbon nanotubes, determines its excellent electrical conductivity. The solubility of pure carbon nanotubes in either water or organic solvents has been a limitation to the practical use of this unique material. This article adopted the method of azide covalent functionalization of carbon nanotubes, preparation of polystyrene coated multiwalled carbon nanotubes. Then used situ suspension polymerization preparation of antistatic polystyrene superfine powder, significantly improved the mechanical, electrical and thermal properties of polystyrene resin.1. Azide covalent functionalization of multiwalled carbon nanotubes, first we prepared Poly (acryloyl chloride)-co-polystyrene (PACl-co-PS) via free radical polymerization. Then, through azide reaction gained azide acyl azide group (-CON3) which produce nitrene under high temperature, reacting with the sp2 carbon in MWCNTs to grafted onto MWCNTs, got polystyrene modified multiwalled carbon nanotubes. Fourier infrared spectrum (FTIR), scanning electron microscopy (SEM), Raman spectroscopy (Raman), transmission electron microscopy (TEM), elemental analysis, thermo-gravimetric analysis (TGA) has been used to characterize the structure of modified MWCNTs. The experimental results show that polystyrene successfully grafted to the surface of MWCNTs. And the grafted amount increase with increasing of the azide degree and decreasing of the degree of copolymer.2. Situ suspension polymerization was used to preparation of polystyrene superfine powder, dodecyl benzene sulfonate (SDBS) joined as second dispersant. We studied the influence of the rotate speed, the dosage of dispersants and MWCNTs on particle size. When the dispersant dosage was 1.5 wt%, rotating speed was 650r/min, the average particle size of microspheres was 53 ?m, the dispersion coefficient was about 0.10, with narrow distribution. The MWCNTs has a certain effect on the particle size, but the effect was relatively small.3. Antistatic PS-co-APAA-g-MWCNTs/PS composite was preparation by situ suspension polymerization, which anti-static electricity was better than pure MWCNTs/PS composite. The addition of PS-co-APAA-g-MWCNTs aslo obviously improved the mechanical properties and thermal stability of the composite materials.