Durable flame retardant and antibacterial finishing on cotton fabrics with cyclotriphosphazene/polydopamine/silver nanoparticles hybrid coatings

• Published in: Applied surface science 2018-03, Vol.435, p.1337-1343
• Main Authors: Li, Yingzhan, Wang, Bijia, Sui, Xiaofeng, Xie, Ruyi, Xu, Hong, Zhang, Linping, Zhong, Yi, Mao, Zhiping
• Format: Article
• Language: English
• Subjects: Antibacterial; Cotton; Dopamine; Durability; Flame retardant
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2017.11.269

•Polydopamine and flame retardant were simultaneous applied on cotton fabrics.•AgNPs was reduce in situ on the coating in the absence of external reducing agents.•Durable flame retardancy and antibacterial activities was obtained. Durable flame retardant and antibacterial hybrid coatings were developed for cotton fabrics via simultaneous polymerization of dopamine and hydrolytic condensation of N3P3[NH(CH2)3Si(OC2H5)3]6. Silver nanoparticles were also introduced to the coatings by in situ reaction of AgNO3 with catechol moieties on polydopamine (PDA) in the absence of any external reducing agents. Energy dispersive spectrometer (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) were employed to study the morphology and constitution of the coatings. Thermal stability and combustion behaviors were characterized with thermogravimetric analysis (TGA) and vertical flammability tests. Considerable flame retardancy was obtained for the modified cotton fabrics, which also exhibited decent antibacterial activities (99.99%) against Gram-positive bacteria S. aureus and Gram-negative bacteria E. coli. The modification was durable with largely intact flame retardancy and antimicrobial properties after 30 washing cycles.