Preparation And Capability Study Of Polyethylene Nanoplastic

Nanoplastic is a kind of new high-tech material. It is organic/inorganic nanometer composite in which the inorganic filled with measure of nanometre disperses in the basal body of organic polymer. Polyethylene has steady chemical characters. But low intension and easy to deform, not fireproof, and easy to fire, therefore, the applications of polyethylene are restricted. It is necessary to modify the property of polyethylene with the nanotechnology. Modifying can enhance the capability and enlarge application field of polyethylene. We have many methods of preparing the polyethylene Nanoplastic, for example, crossblend, in-situ polymerization, intercalaction composite, and so on. Intercalation of polymer is a method that the polymer was intered into the filling with crossblend of melting. As one kind of filler, Montmorillonite is most extensive and useful. It belongs to sandwich(laminarization)silicate. Ion exchanging take place between of cationic surfactant and the Si⁴⁺,Al³⁺ in the space, which can make the surface of montmorillonite from hydrophilic to oleophilic and enhance the compatibility of polyethylene with montmorillonite. When polyethylene enters the slice of montmorillonite under the appropriate condition, we could gain the polyethylene/organic montmorillonite composite. In the paper, we prepared series of organic montmorillonite by ion exchange agent between the inorganic cation in the layer of montmorillonite and the cation exchange agent of hexadecyl trimethyl ammonium bromide, hexadecyl trimethyl ammonium chlorine, dodecyl trimethyl ammonium chlorine and di-octadecyl dimethyl ammonium chloride. The result of the cation exchange capacity (CEO) of the montmorillonite indicated that montmorillonite has agreeable cation exchange capacity. At the same time, we study the rheological character of organic montmorillonite in the dimethyl benzene. The result indicated that the organic montmorillonite could swell and form the gel. Under the same shearing the viscosity of gel is related with the structure of alkyl chain of hyamine cation, when dehexadecyl hyamine as intercalation-agen, the viscosity was strangest, the organic component most and the effect best. The structures of the nanomontmorillonit, organic montmorillonite and polyethylene Nanoplastic characterized by means of the infra red spectrum and X-ray diffraction. The relation of the interlayer space of montmorillonite with alkyl chain of hyamine cation. The result indicated that the insertion of polyethylene affected the interlayer space of montmorillonite. The intercalation-agents intercalated into the layers of montmorillonite. The interlayer space increased from 1.53nm to 1.99³.48nm, and the interlayer space of Nanoplastic rose to 2.167nm～2.861nm. This indicated that the intercalation-agent has entered into the space of montmorillonite. In this paper the Nanoplastic has formed: the melt intercalation of the polyethylene with organic montmorillonite was discussed emphatically. The polyethylene nanocomposite was prepared and the relation of some mechanical properties and the contents of organic montmorillonite, nicluding the tensile strength, the yield strength, the elongation at break,the tensile modulus and so on. With the content of OMMT increasing, the tensile strength, the yield strength and the elongation at break of the composites reduce. The tensile modulus and flexural strength increase firstly, but when the content excess they will decrease; the hardness continually increase but not obviously. The flexural modulus and melt index increase apparently. The softening point changes little, which means the composites has the instent thermal stability.