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RISS 인기검색어
- 검색키워드
- 저자 : Ivan Novakov (검색결과 2 건)
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Evgeny Bryuzgin,Viktor Klimov,Manh Duc Le,Alexander Navrotskiy,Ivan Novakov 한국섬유공학회 2020 Fibers and polymers Vol.21 No.5
We suggest a simple and reproducible strategy for fabricating durable superhydrophobic coatings on the basis ofseries of functional random copolymers of alkyl methacrylates and glycidyl methacrylate on cotton fabric surface. Theprocedure consists of the fabric treatment by solutions of copolymers in methylethylketone and following heating at 140 °C. The initial contact angles of obtained coatings on fabric surface achieve 165 °. The dependence of superhydrophobicproperties of coatings based on copolymers of glycidyl methacrylate and alkyl (meth)acrylates (with alkyl radicals С4-С18 inside chains) attached to the cotton fabric surface was studied. The comparative analysis of superhydrophobic state stability ofpolymer coatings during long-term contacts with aggressive media is presented. We evaluated the contact angles stability as afunction of prolonged contact of polymer coatings with water under saturated vapor conditions, organic solvents, andsynthetic detergents. Polymeric coatings based on a copolymer of lauryl methacrylate (С12) and glycidyl methacrylateprovide better stability of superhydrophobic properties compared with other copolymers of alkyl methacrylates.
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Evgeny Bryuzgin,Ekaterina Bryuzgina,Vitaliya Yartseva,Kristina Belina,Olga Makevnina,Olga Kolyaganova,Viktor Klimov,Alexander Navrotskiy,Ivan Novakov 한국섬유공학회 2022 Fibers and polymers Vol.23 No.9
Chitosan is a promising polymer from natural polysaccharides, which is an environmentally friendly compoundfrom renewable raw materials. Chitosan has biodegradability, biocompatibility, and antibacterial and other activities. In thisarticle, we report the biodegradation control of chitosan materials by use of random copolymers based on glycidylmethacrylate and (fluoro)alkyl methacrylates as surface modifiers. We show that grafting of copolymers allows increasing thehydrophobicity of chitosan materials with initial contact angles up to 114 ° from 89 ° for films and up to 154 ° from 123 ° foraerogels. We demonstrate that modified aerogels retain contact angles of more than 150 ° for a long contact time with waterwhile the initial aerogel fully wets for 30 s. The resulting chitosan aerogels have high porosity with a pore size of 100-200 μm, and the pore walls are 0.6-0.7-μm-thick film formations. Our study of lyophilic properties of modified chitosansubstrates showed a change in the hydrophobicity of the materials as a function of length of the hydrocarbon radical in theside groups of the (fluoro)alkyl methacrylates in the copolymers. We demonstrate that the rate of biodegradation of theresulting materials decreases with an increase in the number of hydrophobic groups in the modifier. The obtained chitosanmaterials with hydrophobic coatings have potential as a protective layer for wound dressings with an extended service life.
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