In this research, an efficient and facile procedure, which can be applicable to industry, was attempted to be developed by examining the reported method and new methods (methods 1 & 2) for the preparation of hybrid latexes composed of polyurethane(PU) and polyacrylate. According to the known procedu...
In this research, an efficient and facile procedure, which can be applicable to industry, was attempted to be developed by examining the reported method and new methods (methods 1 & 2) for the preparation of hybrid latexes composed of polyurethane(PU) and polyacrylate. According to the known procedure, a mixture of diisocyanate, polyol, butyl acrylate (BA), methyl methacrylate (MMA), 1,4-butanediol (BD), hexadecane (HD), and sodium dodecylsulfate (SDS) in water underwent the ultra-sonication to form the miniemulsion, the addition reaction to form polyurethane (PU), and finally the radical polymerization to form PU-polyacrylate hybrid miniemulsions.
In method-1, the diisocyanate and polyol were reacted to form PU prepolymer, followed by the addition of BA, MMA and BD. Polyurethanes were formed in the mixture. And then, an aqueous solution of SDS was added to the resulting PU, followed by ultra-sonication, and subsequently radical polymerization. In method-2, the PU prepolymer was reacted with BD to form PU, which was then dissolved in a liquid mixture of BA and MMA, followed by the addition of an aqueous solution of SDS. The resulting mixture underwent the ultra-sonication and subsequently radical polymerization.
The average sizes of the resulting PU-polyacrylate latexes, prepared by the three different methods, were similar to each other. The thermal properties and water-resistances of the films, prepared from the three different latexes, were not much different. However, the molecular weights of the PU molecules, prepared by method-1 and method-2, were greater than that prepared by the known one-pot procedure. Accordingly, both the tensile strength and elongation of the films, prepared by the new methods, are higher than those prepared by the one-pot process, due to the higher molecular weights of PU.
The polyurethane prepolymers are chain-extended in the presence of acryl monomers in method-1, while the polyurethanes should be dissolved in a liquid mixture of the acryl monomers in method-2. Therefore, based on the present experimental data, method-1 seems to be better than method-2, due to the lower viscosity of the reaction medium.
In this research, an efficient and facile procedure, which can be applicable to industry, was attempted to be developed by examining the reported method and new methods (methods 1 & 2) for the preparation of hybrid latexes composed of polyurethane(PU) and polyacrylate. According to the known procedure, a mixture of diisocyanate, polyol, butyl acrylate (BA), methyl methacrylate (MMA), 1,4-butanediol (BD), hexadecane (HD), and sodium dodecylsulfate (SDS) in water underwent the ultra-sonication to form the miniemulsion, the addition reaction to form polyurethane (PU), and finally the radical polymerization to form PU-polyacrylate hybrid miniemulsions.
In method-1, the diisocyanate and polyol were reacted to form PU prepolymer, followed by the addition of BA, MMA and BD. Polyurethanes were formed in the mixture. And then, an aqueous solution of SDS was added to the resulting PU, followed by ultra-sonication, and subsequently radical polymerization. In method-2, the PU prepolymer was reacted with BD to form PU, which was then dissolved in a liquid mixture of BA and MMA, followed by the addition of an aqueous solution of SDS. The resulting mixture underwent the ultra-sonication and subsequently radical polymerization.
The average sizes of the resulting PU-polyacrylate latexes, prepared by the three different methods, were similar to each other. The thermal properties and water-resistances of the films, prepared from the three different latexes, were not much different. However, the molecular weights of the PU molecules, prepared by method-1 and method-2, were greater than that prepared by the known one-pot procedure. Accordingly, both the tensile strength and elongation of the films, prepared by the new methods, are higher than those prepared by the one-pot process, due to the higher molecular weights of PU.
The polyurethane prepolymers are chain-extended in the presence of acryl monomers in method-1, while the polyurethanes should be dissolved in a liquid mixture of the acryl monomers in method-2. Therefore, based on the present experimental data, method-1 seems to be better than method-2, due to the lower viscosity of the reaction medium.
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#폴리우레탄 폴리아크릴레이트 혼성 라텍스 디이소시아네이트 Diisocyanate
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