Surface properties sometimes play a more important role in the function of polymer materials than do the bulk of polymer materials. Surface structure of the fibers is very important in their processing as well as end use because many functions of the polymer materials, e.g. hydrophilicity, hydrophobicity, adhesion, dye ability and liquid penetration are related to the topmost layer of the materials. To prepare textiles with high hydrophobicity, the surface is modified by the polymer coatings. There has been long time that repellency is one of the most important purposes for specially textile industries. In advanced technology, to increase surface hydrophobicity, besides low surface energy, suitable surface roughness is required as well. So far, a wide variety of surface treatments techniques have been investigated to produce low surface energy materials with the properties of water and oil repellency by the silicon and fluorochemical polymers. Although the best hydrophobic results are created by the fluorocarbons, some dangerous byproducts are generated not degradable in the nature that should be replaced by the year 2015 according to the universal laws. Therefore, it is very important to find the method to modify the present fluorochemicals. In this research, the effect of fluorochemical structures on their application and fastness properties were investigated. Therefore, flurochemicals with the technology of C6 and C8 as well as new dendrimer components, with and without using boosters, were applied to the polyester and cotton fabrics to create repellent properties and compared with each other. Since fluorocarbons have some drawbacks such as wash fastness, reorientation of the fluorochemical chains and high temperature to cure, to improve their repellent properties, fastness and reduction of drying temperature, different dendrimers and boosters have been used and it was investigated how they affect C6 and C8 fluorochemicals properties. Also, application of the different temperatures and materials to develop fastness was evaluated. The results were compared with different methods of 3M water repellency, curing temperature, wash and abrasion fastness, FT-IR. According to the results, replace of the C8 fluorochemicals with the C6 ones is possible in the presence of the nonpolar aromatic components in their formulation. The dendrimers could improve fastness properties of the C6 fluorocarbons. The effect of the boosters on the performance of the fluorochemicals is related to the curing temperatures. In addition, orientation of the flurochemicals after abrasion and wash processes is influenced by the additives and curing temperature as well. Key words : fluorochemicals, water repellency, oil repellency, booster, hydrophobicity
