Preparation And Properties Of Polystyrene/nano-molybdenum Disulfide Composites

Polystyrene (PS) is a kind of excellent insulator with high volume resistivity, about 10¹⁶Ω·cm, but the PS products will bring static electricity during the course of producing, conveying, depositing and using, which makes PS products are so prone to adsorb dusts that they are hard to mould. What's more, PS is brittle. These disadvantages dramatically influence PS's applications. Therefore, research on conductive PS composites is significant, and it is better if PS's mechanical properties can be improved at the same time.Molybdenum disulfide (MoS₂) is a kind of layed semiconductor (its room temperature conductivity is 10⁷Ω·cm), its nanosized sheets poss largish diameter/ thickness ratio. This structure is favor of nano-MoS₂'s disperse in polymer matrix. Nano-MoS₂ was choiced as the conductive filler of PS. The main work as follows:â‘ MoS₂ was crushed and exfoliated with supersonic jet mill. Under the function of high speed air flow, material grains will bump each other, and the air flow will produce impact cut toward them, meanwhile, material grains will impact, cut and scrub crushing room, it is no other than these processes prepared MoS₂ nano-sheets.â‘¡Nano-MoS₂ was prepared using lithium chloride to exfoliate chemically. MoS₂ has strong appetency to adsorb lithium ions, which makes portion of lithium ions can be embedded the sheets of MoS₂, and joined outside force, MoS₂ can be exfoliated at a certain extent. The results of X-ray diffraction (XRD) and scanning electronic microscope (SEM) indicated that both of the two methods can prepare partially exfoliated MoS₂ nano-sheets effectively. The mechanisms of the two methods were analyzed, too. Since the quantity of nano-MoS₂ prepared by the latter method one time is too few, nano-MoS₂ used in this paper is prepared by the first method.â‘¢PS/nano-MoS₂ composites were prepared by in-situ polymerization. The influence of MoS₂ content on the polymerization of styrene was studied, and the technics conditions which can make styrene polymerize fully were discussed at this base, such as heating...