Study On Preparation And Characterization Of Flowable Polyaniline

Polyaniline (PAn) has various structures, a higher conductivity, a unique mechanism of doping, excellent physical properties and a good environmental stability. Its raw materials are cheap and easy to get, also the synthetic method is simple. Because of these advantages, it has become one of the most promising focuses on the research of conductive polymer materials nowadays. Since PAn was found, its theoretical basis and application technique have developed a lot. It still has many disadvantages, such as a poor dispersion and a worse processability during the process of research.At present, researchers at home and abroad mainly concentrate on the studies of improving the conductivity and solubility of PAn during the process of doping. It has not substantially changed the existing state, the apparent remains the solid powder, and it has not undergone a solid-to-liquid transition. There are still great restrictions in processing of PAn. In order to improve its processability effectively, we use long-chain nonylphenol ethoxylates (10) sulfuric acid as dopants to make polyaniline effectively doped. The solid conductive polyaniline with an excellent performance has been synthesized. Meanwhile, through determination of the reaction conditions we got the the flowable product with a special performance at last.. The research achievements obtained in this paper are shown as follows through the analysis on the structure and performance of the products:1. Unflowable polyaniline presents solid powdery, and its solubility has been improved because of the doping of a long chain. The doping of the anions makes the electronics of polyaniline chain more easily to delocalize which makes the conductivity of polyaniline substantially improved.2. After the squashing and the surface silver-plating on the product, we measured the conductivity using the digital bridge. The optimum reaction conditions with a high-conductivity were determined through further comparative analysis. The results show that reaction conditions make a certain influence on the conductivity. The prolonged reaction time (for 4 h, 8h, 12h, 16h, 20h.) makes the conductivity decreased at first and then increased. There is an extreme at 12h. At the same time increasing of the temperature is unfavorable to the increasing of conductivity of PAn.3. We successfully got a novel flowable polyaniline by using the long-chain acid to dope PAn. This polyaniline derivative has been characterized through series of analysis such as FTIR, SEM, TEM, TG and the cycle of DSC. We confirm that because of the effectiveness of doping reaction, we prepare a class of the new polyaniline with high solubility and thermal stability. It has a certain fluid behavior under the solvent-free state.4. The analysis of rheology shows that the flowable polyaniline behaves solid. The storage (G') Moduli is always higher than the loss(G") moduli. Meawhile its viscosity increases with the increasing temperature. The process is reversible. This particular phenomenon may be due to the special force in the molecular after the doping.