Synthesis And Characterization Of The Fluorine-containing Hydrophobic And Oleophobic Materials

Wetting phenomenon is one of interface phenomena which are often seen in nature, it is also one of solid surface important features .It can affect some living activity of organisms, such as animal skin and plant's surface, super-hydrophobic and self-cleaning phenomenon are more common in nature. For example, lotus-effect, butterfly' wing and feather of bird. All of those phenomena indicated that wetting plays an important role in everyday life, industry and agriculture production.Wetting property of solid surface is depended on the surface micro structure and on the chemical composition of outermost surface layer. It is well known that wetting property of solid surface is mainly influenced by the chemical composition of solid surface, the larger the surface free energy, the much moist the solid is, vice versa. Thus, perfluoroalkyi or siliconalkyl chain are utilized in industry for the production of various surface functional chemicals such as hydrophobic or oleophobic material to reduce surface free energy.We have known PTFE has a very low surface free energy (18mN/m), it has many particular properties, such as water- and oil- repellency, non-sticking, chemical resistance and self-cleaning. The series material is paid attention by people. The research of hydrophobic or oleophobic material began from the middle 1950s, with the development of life science and material technology the deep understanding has been made.Base on the survey of previous literatures, in the present paper we reported a series novel fluorine-containing hydrophobic or oleophobic material.The paper is divided into four parts:Chapter one: A reviewThis chapter elaborated the relative theory of wetting and hydrophobic or oleophobic material, such as preparing technology of low free energy solid surface, the principle and methods of preparation, the structure and characteristics of perfluoroalkylethylacrylate polymer, the application and progress of fluorine -containing material, the proposition and design of this theme.Chapter two: syntheses of fluorine-containing polymer with monomer I by solution polymerization. In this chapter, we synthesize the monomer I by one step, then synthesize fluorine-containing polymer with monomer I . The thin film of polymer is clear and uniform, with being hydrophobicity and oleophobicity. However, the yield of monomer I is not satisfactory. Moreover, the procedure is not simple, concerning harmful solvent TFT.Chapter three: syntheses of fluorine-containing polymer emulsion with monomer II by emulsion polymerization.In this chapter, we synthesize a novel fluorine-containing polymer emulsion in water phase by using the monomer II ,MMA, BA as starting material, SDS and OP-10 as emulsifier, and PPS as initiator. The results show that the product has good stability and film-forming property. Meanwhile, the thin film of latex is clear and smooth with good hydrophobicity and oleophobicity, the higher thermal stability and chemical resistance.Chapter four: syntheses of fluorine-containing polymer with core/shell structure by emulsion polymerization.In this chapter, a novel fluorine-containing polymer emulsion with core/shell structure was prepared in water phase through a two-stage emulsion polymerization method. That is, using a nonfluorine monomer(BA, ST) as core, and the fluorine-containing monomer III, BA, ST, AA as shell, to create a hydrophobic and oleophobic surface and raise the efficiency of fluorine compared with other particle structures such as random copolymer or latex blending. The final product is a clear, clearness, smooth polymer film coating, indicating the presence of nanophases as shown by TEM. The fluoropolymer latex has good stability and no pollution in surrounding. The surface of polymer film was found to have an excellent hydrophobicity and oleophobicity. At the same time, the outstanding thermal stability, chemical resistance and good film-forming properties were also tested. The film's hydrophobicity and oleophobicity are more strength after annealing, AFM photos have verified it.