The Water/oil-repellent And Protein-resistant Properties Of Amphiphilic Fluorosilicone Copolymer Coatings

Fluorinated silicones have excellent physical and chemical properties, such as well waterand oil- repellency, etc. Hydrophilic segments as poly(ethylene oxide)(PEO) also have the ability to resist the adsorption of protein. Therefore, it is instresting to study the water/oil-repellent and protein-resistant properties of the coatings of amphiphilic fluorosilicone copolymers.In this paper, amphiphilic fluorosilicone copolymers with different chemical components are obtained by hydrosilylation reaction. The relationship between surface water/oil-repellency or protein-resistant properties and the chemical structure of amphiphilic fluorosilicone copolymers is studied in detail. Moreover, the amphiphilic fluorosilicone copolymers are finished on the cotton fabrics, and the surface properties of finished fabrics are studied. The main results are shown as follow:1. Some kinds of PHMS with different molecular weight and hydrogen values are obtained by cationic ring-opening polymerization, and PHMS-g-(EO,AGE,PFBE) or PHMS-g-(EO,AGE,PFHE) copolymers are acquired by hydrosilylation reaction.(1) A series of different molecular weights and hydrogen value polysiloxanes are prepared by cationic ring-opening polymerization of D4, D4 H, MM monomers in a nitrogen atmosphere, at a reaction temperature of 75?.(2) By hydrosilylation reaction, different amphiphilic fluorosilicone graft copolymers with polysiloxane as the main chain and EO, AGE, PFBE or PFHE as the side chain are prepared in this work.2. The performance of water- and oil-repellency is studied for the amphiphilic fluorosilicone copolymers and the relationship between surface water/oil-repellency or protein-resistant properties and the chemical structure of amphiphilic fluorosilicone copolymers is studied.(1) XPS results show chemical composition and structural arrangement of amphiphilic fluorosilicone copolymer coating surfaces are changed by a deionized water treatment.(2) AFM results show PHMS-g-(EO,AGE,PFBE) and PHMS-g-(EO,AGE,PFHE) copolymer coating surfaces are relatively smooth and the surface roughness was less than 4.2 nm, which has no effect on the contact angle and water/oil-repellency of coatings.(3) CAM results show the surface energy of that amphiphilic fluorosilicone copolymer is lower than 22 m N/m. The performance of water/oil-repellency and anti-protein of the copolymers are improved by increasing the amount of fluorine. The performance of water- and oil-repellency are changed because chemical composition and structural arrangement of that amphiphilic fluorosilicone copolymer coating surface are varied by deionized water treatment.3. Anti-protein adsorption of amphiphilic fluorosilicone copolymer coating is detailed investigated by controlling the chemical structure of amphiphilic polymers.(1) Amphiphilic fluorosilicone copolymer is better than PHMS-EO polymer in terms of resisting the adsorption of protein; Amphiphilic fluorosilicone copolymer coating has the optimal impedance properties of protein adsorption when its chemical structure is 16.7 mol% AGE, 33.3 mol% EO, 50.0 mol% PFBE, such as F4 copolymer.(2) Because the interaction of hydrophilic part and the low surface energy segment, protein-resistant properties of the polymer coatings is controlled. Furthermore, the water- and oil-repellency of fluorine and silicone materials are improved when the hydrophilic segments are grafted on the fluorosilicone segments.4. The water/oil-repellency and protein-resistant properties of the finished fabrics are studied.(1) HLB values of emulsion is obtained by emulsification, and the polymer emulsion has the best stability when the HLB value is 11 or 12.(2) CAM results show the fabric finished by amphiphilic fluorosilicone copolymer with fluorine content at 6.7%, AGE content of 16.7%, EO content of 16.7% by padding has good water/oil- repellency and anti-protein adsorption properties.(3) SEM results show the finished fabrics are covered with a layer of polymer coatings, which reduce the surface energy of the cotton fabric, and then improve the water and oil repellency and anti-protein adsorption properties of the fabrics. Because of the presence of epoxy groups, moreover, the fabric with amphiphilic graft copolymer has a good wash fastness.