Preparation And The Study Of The Conductivity Of Polymer Filled With Nanoparticals

With electronic industry's high-speed development, computer, electro-equipment of medical treatment and kinds of communication products are more popular, the interference of electromagnetic wave is more and more worse. We must screen the electro-equipment to make sure that they can work well and avoid the interference of electromagnetic. There are three main kinds of electric dope which base on Ni, Cu, and Ag, we can use them to screen the electromagnetic wave for the equipment. Considering the electricity property and the price, Cu is the best, but it is easy oxidic, we can't avoid to use the Ni paint. Cu power, especially the nanoCu, will form compact oxide coating on the surface, make it to be the dielectric, then lose the ability of screening electromagnetic wave.Nanoparticals are apt agglomerate for its large specific surface area and high surface energy, and it is poor combination with organic basic body and poor chemical stability influence the absorptive ability. All these disadvantages limit the application of the nanoparticals. So nanoparticals must be modified on the surface to improve the ability of dispersing.In this thesis, the surface midification of nanoCu has two effect.First,the oxide layer can be wiped off by using of surface active agent,coupling agent and high polymer, this can improve the dispersing of nanoCu. Second, nanoCu can be coated with Ag and graphite by chemical plating and Arc-discharge. This can improve the conductivity and oxidation resisting.According to the active index, the best dosage of midifier, the best temprature and time of modification can be fixed on. The augement performance of midified nanoCu was analyzed by comapring the results of surface resistivity, FT-IR, XRD, TGA and SDTA with the nonmodified nanoCu.Cu nanoparticles were surface modified by sodium dodecyl benzene sulfonate (SDBS),Oleic acid,silane coupling agent(KH-560).The optimal modification condition was chose according to the active exponent.The combination manner was analyzed between the modification agents and Ce nanopoarticles,The results showed that, Oleic acid is a kind of modification agent for Cu nanoparticles compared the other two. The well antxoidation of NanoCu can get through coating with Ag and graphite by chemical plating and Arc-discharge, for the oxide later can prevent the contact of the nanoCu and air. So the nanoCu which has well ability of antxoidation and dispersing can be prepared.