Preparation And Properties Of Super Hydrophobic Polyaniline Composites Of Anionic Surfactant System

Materials, energy, information are the three pillars of today's society, and the birth of many new materials makes the whole world more colorful. Thanks to the superior performance , light weight and cheap prices, polymer materials are widely used in industrial and agricultural production and all aspects of daily life. The appearance of conducting polymer breaks of the traditional concept that all polymers are insulator, and thus a series of high-tech materials with excellent properties. Polyaniline has attracted considerable attention due to its unique reversible doping / de-doping properties, electrical and optical properties, and a wide range of applications in batteries, sensors, electromagnetic shielding and metal corrosion etc. However, there are still some problems should to be solved in practical applications, for example, the conductivity of polyaniline is vulnerable to the external environment and weather, and the performance of its electrostatic conduction may be limited or even disappear in bad weather or poor environmental conditions which seriously affecting its actual use. How to ensure that the properties of polyaniline in a real environment not to be affected is an important condition of its application and promotion. Superhydrophobic materials with a water contact angle greater than 150°have became a research hotspot recently due to its superior properties such as self-cleaning, anti-corrosion and anti-oxidation, however, the problem of static-charge accumulation exist in the using of superhydrophobic materials which possibly causing a fire or an explosion in some dry conditions, so how to give the superhydrophobic materials a property of removal of static electricity has an important practical significance. The main work of this article concentrates on the preparation of super-hydrophobic polyaniline, and connect to the conductivity of polyaniline to get new functional materials with comprehensive properties. Meanwhile, a non-fluorinated surfactant was used to change the surface chemical components in preparation for the first time which avoided the fluoride pollution and cost issues. The main results are as follows:(1) Polystyrene/polyaniline composite microspheres with the morphology of barbed spheres are synthesized using polystyrene microspheres as hard template and the doping of the anionic surfactant sodium dodecyl benzene sulfonate changes the wettability of material from hydrophilic to hydrophobic, eventually, getting a super-hydrophobic composite materials. The relationship between the microstructure, surface chemical components and the hydrophobic properties has been studied by changing the experimental conditions and it is found that the doping of SDBS is the main reason to changes the surface chemical components from hydrophilic to hydrophobic while the barbed spheres morphology greatly enhanced the hydrophobic property of the material to the super-hydrophobic range.(2) Rod-like polystyrene/polyaniline composite has been synthesized in the anionic surfactant sodium dodecyl benzene sulfonate micelle, and super-hydrophobic composite obtained by de-doping sodium dodecyl benzene sulfonate. The morphology of the material has been changed from rod to belt, tube and bunch. The relationship between the microstructure, surface chemical components and the hydrophobic properties has been studied which indicated that material with a one-dimensional rod-like morphology gain super-hydrophobic properties easier than that with a zero-dimensional microsphere morphology, and the concentration of sodium dodecyl benzene sulfonate needed for doping is lower.(3) Super-hydrophobic polyaniline has been synthesized in the anionic surfactant sodium dodecyl benzene sulfonate micelle by simply one step which greatly simplified the experimental procedure. Microstructure and surface chemical components have been controlled in the same time by changing the experimental conditions, finally, control the super-hydrophobic properties of the material. It is found that sodium dodecyl benzene sulfonate act as soft template and dopant at the same time during the reaction, and higher concentration of sodium dodecyl benzene sulfonate and stronger acidity are the two main control factors of the preparation of super-hydrophobic polyaniline.