Study on syntheses of phosphates and transition-metal complexes on viscoserayon felt for flame retardancy

High-performance materials for flameproofing, phosphates (polyphosphate and ammonium phosphate) were synthesized on viscose rayon felt. This surface r eaction has the advantage of a nonblooming effect and an application in the rmosetting plastics, Metal complexes have the effect of reducing the amount of smoke. Therefore, in the second step, transition-metal complexes were s ynthesized on the viscose rayon ammonium phosphate felt. This article focus es on the surface modification of phosphates and metal complexes on viscose rayon. All reactions were confirmed by attenuated total reflectance Fourie r transform infrared and time-of-flight secondary ion mass spectrometry. As the concentrations of phosphoric acid and urea increased, the peak intensi ties of ammonium ion groups and phosphate groups greatly increased. The the rmal properties of the synthesized materials were studied with thermogravim etric analysis and oxygen index testing. On the basis of the experimental r esults, the synthesized flame-retardancy materials showed excellent physico chemical and thermal effects and flame retardancy. (C) 2000 John Wiley & So ns, Inc.