Abstract
In this work, a combination of the advantages of the soft hydro gels and strong hydrophilic macromolecule brushes was performed from a hydrophobic micro-block amphiphilic copolymer by compolymerization of the amphiphilic monomer (hydrophilic) and functional monomer (hydrophobic). The amphiphilic electrolyte was used for anti-fouling and the functional unit was used for crosslinking as well as adhesion to the substrate surface. The copolymer coating was prepared on the hard substrate and become a soft hydrogel after swelling in water. Therefore, this method is very promising and these new materials make it possible to develop environmentally benign, effective and durable anti-fouling coatings.
The amphiphilic copolymer Poly (SBMA-co-GMA) with a hydrophobic micro-structure was synthesized by free radical micellar copolymerization. The impact of reaction condition including dosage of initiator, stirring speed, amount of emulsifier and monomer feed ratio upon the property of the copolymer was investigated. Synthetic formula was optimized based on the assessment of the molecular weight and its distribution, the content of the hydrophilic monomer N-(3-Sulfopropyl)-N-(methacryloxyethyl)-N,N-dimethylammo nium betaine (SBMA) in the copolymer chain, the length and number of the hydrophobic block methacrylic acid 2,3-epoxypropyl ester (GMA) and thermal stability of the copolymer. The properties of amphiphilic copolymer solution were characterized with using rheological methods, transmission electron microscopy (TEM) and dynamic light scattering (DLS). The copolymer soft coating was prepared by solution casting and preparation process was optimized based on the assessment of the impact of copolymer composition, surface properties of the mold and dosage of curing accelerator upon the performance of soft coating.
(1) The amphiphilic copolymer has a high molecular weight, narrow distribution, high SBMA content and excellent thermal stability when using the optimal formula. In addition, the length and number of hydrophobic block in the copolymer chain was suitable and the copolymer solution exhibited excellent resistance to shear, salt and high temperature at this optimal formulation.
(2) The surface properties of mold have a great influence on the adhesive property of coating. The coating prepared on the polyurethane anti-rust coating remained intact in NaCl aqueous solution for a long time and it also showed a strong adhesion between coating and glass surface after a surface modification with KH-550.Dosage of curing accelerator has a great impact upon the morphology and compression modulus of the soft coatings.
(3) The amphiphilic copolymer soft coating prepared at the optimal formulation showed strong hydrophilic and high equilibrium water content. It exhibited high resistance to the attachment of proteins such as BSA and Lys as well as the bacterium such as S. aureus and E. coli. Meanwhile the copolymer coating exhibited lower friction drag than PVA hydrogels, and PTFE because of its strong hydration capacity.
Keywords: environment-friendly; mi cellar copolymerization; amphiphilic copolymer;anti-fouling; drag-reducing
本站文章未经允许不得转载；如欲转载请注明出处，北京桑尧科技开发有限公司网址：http://en.sunspraying.com/
|
