UV-based grafting processes are appropriate tools to improve the surface properties of textile materials without changing the bulk. Based on our previous investigations on the photochemical immobilization of vinyl phosphonic acid, here, a new photochemical method for a permanent flame retardant finishing of textiles is described using allyl-modified linear polyphosphazenes and derivatives. Exemplarily, we show results on the flame-retardant finishing of cotton and cotton/PET blends with allyl polyphosphazene. We used the terminal allyl group for the photo-induced coupling of allyl polyphosphazene on textile substrates. Using our UV technology 20 to 40 weight percent of the functionalized polyphosphazenes can be fixed covalently to different textile substrates. We observed a slight decrease of the fixed polyphosphazene amount after the first washing cycle indicating the removal of non-bonded molecules. After this initial washing step the add-on is stable. Even after six laundering cycles the modified material withstands various standardized flammability tests. In summary, photochemical treatments allow the permanent surface modification of natural and synthetic fibers by irradiating with UV light in the presence of reactive media. We have successfully demonstrated that these procedures are appropriate for the fixation of flame retardants as well. Polyphosphazene modified textiles show high levels of flame retardant performance even after several textile laundering cycles.
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International Seminar on Fire and Explosion Hazards (9; 2019; Saint Petersburg, Russia). Proceedings of the Ninth International Seminar on Fire and Explosion Hazards [Электронный ресурс]. Vol. 2: 21-26 April 2019, Saint Petersburg, Russia / Peter the Great St. Petersburg Polytechnic University, Autonomous Non-Profit Organization "Fire and Explosion Safety", Gefest Holding Ltd ; [edited by A. Snegirev [et al.]. — Электрон. текстовые дан. (1 файл : 98,7 Мб). — Saint Petersburg, 2019. — Загл. с титул. экрана. — Свободный доступ из сети Интернет (чтение, печать, копирование). — Adobe Acrobat Reader 7.0. — <URL:http://elib.spbstu.ru/dl/2/k19-97.pdf>. — <URL:http://doi.org/10.18720/SPBPU/2/k19-97>.
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