Colloids using hexachlorocyclophosphazene (HCCP) and natural polyphenol tannic acid (TA) were synthesized for the first time under precipitation polycondensation conditions. The synthesis parameters were optimized to obtain submicrometer cross-linked polymer colloids with variable TA/HCCP ratios. Using thermogravimetric analysis coupled with FTIR spectroscopy, we demonstrate that TA/HCCP particles exhibit high thermal stability and high char-forming ability. Synthesized polymer colloids can be easily redispersed in water, forming colloidally stable dispersions as confirmed by dynamic light scattering. Aqueous formulations of TA/HCCP particles were used to coat cotton samples. TA/HCCP coatings exhibit excellent flame-retardant properties with a maximal limiting oxygen index (LOI) of 35.
- tannic acid
- bio-based flame retardant
- flame-retardant coating
- precipitation polycondensation