New Hydrophobic Materials Based on Radiation-Synthesized Telomeres of Tetrafluoroethylene and Melamine Spongeстатья
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Дата последнего поиска статьи во внешних источниках: 16 июня 2022 г.
Аннотация:products. By foaming a special resin, it is possible to obtain various foam plastics, including melamine sponges(MS), which, due to their unusual mesh structure and properties, absorb and wash away contamination quite welland have well-pronounced abrasive characteristics. The area of application of melamine sponges can be significantlyexpanded by their modification. Radiation-synthesized telomeres of tetrafluoroethylene (TFE) are of considerableinterest for MS modification, as they make it possible to create protective hydrophobic coatings on various materialsand products. This work presents the results of studies of the MS hydrophobization process, using TFE telomeres,synthesized in acetone and the binary solvent of freon 113 + ammonia. The composition and structure of hydrophobizedmelamine sponges have been studied by the methods of X-ray photoelectron and Raman spectroscopy,optical and scanning electron microscopy. It is shown that the treatment with tetrafluoroethylene telomere solutionsmakes it possible to give the initial hydrophilic material a highly hydrophobic state, characterized by a contactangle of wetting of the order of 135°–140°. This treatment significantly improves the performance characteristicsand expands the practical application possibilities of melamine sponges. The morphology and composition of themodified samples have been studied. It is shown that the telomere can exist in two different states in the MS spatialnetwork: closely bound and loosely bound fractions. The loosely bound fraction can be removed mechanically,the closely bound fraction remains on the MS surface even after several treatments with solvents, ensuring thestability of the hydrophobic properties of the sponge.