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Durable Flame Retardant Finishing of PET/Cotton Blends Using a Novel PVA-Based Phosphorus-Nitrogen Polymer Qiang-Lin Li,1,2 Xiu-Li Wang,1 De-Yi Wang,1 Yu-Zhong Wang,1 Xi-Ning Feng,2 Guang-Hong Zheng2 1Center for Degradable and Flame-Retardant Polymeric Materials, College of Chemistry, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610064, China 2Key Laboratory for Eco-Friendly Dyeing and Finishing of Textile, Sichuan Province, Dyeing and Finishing Chemical Department, Chengdu Textile College, Chengdu 611731, China Received 20 December 2010; accepted 17 January 2011 DOI 10.1002/app.34182 Published online 21 April 2011 in Wiley Online Library (). ABSTRACT: A novel polymeric flame retardant (FR) limited oxygen index (LOI), vertical burning test, cone cal- with phosphorous-nitrogen pendent groups (PVP-P-DCA) orimetry test. The durability effect, thermal stability, and was synthesized by polyvinyl alcohol (PVA), phosphoric flame retardancy mechanism of the treated T/C were acid, and dicyandiamide (DCA). Its structure was charac- investigated by TGA, FTIR, and SEM. The results show terized by FTIR, 1H, 13C, 31P NMR, elemental analysis and that PVP-P-DCA is not only an effective FR but also C TG. Poly(ethylene terephthalate) (PET)/cotton blends (T/ a good char-forming agent for the T/C. V 2011 Wiley Perio- C) was treated via pad-dry-cure process with PVP-P-DCA. dicals, Inc. J Appl Polym Sci 122: 342–353, 2011 The surface of FR-T/C was characterized by FTIR and SEM. The fabric performance was examined by whiteness Key words: blends; flame retardant; synthesis; finishing; and tensile property. The fire behavior was