Study Of Flexible Carbon-containing Polypyrrole Composites Under Ultrasound Irradiation

In this paper, natural flake graphite was applied as raw materials to prepare graphite intercalation compounds (GIC) with chemical oxidation and ultrasound irradiation. Its trade name is expandable graphite. By measuring the structure and morphology of GIC and flexible graphite, we find that the product prepared by ultrasound irradiation is the same as the product prepared by chemical oxidation. Ultrasonic method is not only a new way to prepare GIC; it has but also some obvious advantages. For example, the reaction kettle and the electro bath can be replaced by the ultrasonic cleaning bath, and the reaction conditions are simplified, the reaction time is shortened, and the yield is increased, thereby the energy consumption is reduced and cost savings in the process of the production. Besides, the GIC prepared by ultrasound irradiation can be expanded at lower temperature, and by this way, we can prepare sulfur-containing and sulfur-free flexible graphite.The pyrrole monomer and GIC were firstly put together to prepare the composites by in situ polymerization with ultrasound irradiation, and then the composites were heated and expanded to get flexible carbon-containing PPy composites successfully. The morphology of the composites prepared by the method is different from the one of PPy composites prepared by traditional methods, and the properties have been changed. The advantages of the method are easy- preparation and the quality of the products are very stable. It can be said that the method can not only increase the conductivity of PPy, but also an innovation of the preparation of polymer composites.The research work in this paper realized the goal of the innovation and application combination. Firstly, we prepare GIC with ultrasound irradiation, which the intellectual property we wholly owned. The GIC prepared by the method can not only expanded at much wider temperature range, but also enlarge the application. Secondly, it is an innovation that polymer and graphite are prepared with ultrasound irradiation. Meanwhile, the method can shorten the reaction time and lay the foundation for the industrialization of polymer preparation. Thirdly, the low-temperature expansion technology is applied to modify polymer. It is also unique at home and abroad. This technique can not only increase the conductivity, but also change the traditional morphology of PPy composites.The main work of this thesis:1. Using 50 mesh (320um) flake graphite as raw materials to prepare GIC by chemical oxidation, which lay the foundation of preparing GIC with ultrasound irradiation.2. Using 50 mesh (320um) flake graphite as raw materials to prepare sulfur-containing and sulfur-free flexible graphite with ultrasound irradiation. The GIC can be expanded at low-temperature.3. The structure of GIC and flexible graphite have been measured by UV,SEM,TEM and XRD.4. Preparing of flexible carbon-containing PPy by in situ polymerization with ultrasound irradiation and measuring the structure and morphology of the composites.5. To study the influence on the preparation and conductive properties of flexible carbon-containing PPy.