Thermal Analysis of Healthy and Ecological Friendly Flame Retardants for Textiles
Flame Retardants (FR) are a group of anthropogenic environmental contaminants used at a relatively high concentration in many applications. Currently, the largest marked group of FRs is halogenated FR, and many of them are considered toxic, persistent and bio accumulative. Non-halogenated alternatives are a possible solution for the problem, but there is a lack of knowledge concerning environmental impact, health risks during the production process and final use. The main objective of the LIFE-FLAREX project that supports this work, is the mitigation of the environmental and human health impact of flame retardants used in textiles, looking for new efficient more ecological and healthy alternatives, able to replace the most common FR’s that include toxic compounds like halogens, formaldehyde and antimony. The aim of this work is to determine the effect of conventional and ecological flame retardants on cotton and polyester fabrics by the application of differential scanning calorimetry DSC and thermogravimetric analysis TGA. Results have been compared with those given by the best FR applied to cotton/polyester blended fabric. The application of DSC up to 550°Cand TGA up to 600°C in N2 and O2 atmospheres give results that are in accordance with those yielded by the micro-scale combustion calorimeter. Onset temperatures of decomposition, steps of loss of mass by temperature and final residues, enable to evaluate the thermal efficiency of the different flame retardants. Results have been compared with those given by the application of ammonium polyphosphate and guanidine phosphate on cotton/polyester 50/50 blend.
Keywords: Thermal Analysis, Flame retardant, Cotton, Polyester
 Manich A. (1961). Aprestos y acabados de fibras textiles. (Barcelona: Dalmau y Jover), pp.267-269.
 Hendrix, J.E., Drake, G.L., Barker R.H. (1972). ”Pyrolysis and combustion of cellulose. III. Mechanistic basis for the synergism involving organic phosphates and nitrogenous bases”. Journal of Applied Polymer Science, vol. 16, pp. 41-59.
 Basak, S. and Samanta, K.K (2019). ”Thermal behaviour and the cone calorimetric analysis of the jute fabric treated in different pH condition”. Journal of Thermal Analysis and Calorimetry, vol. 135, pp. 3095-3105.
 El-Shafei, A., ElShemy, M., and Abou-Okeil A. (2015). ”Eco-friendly finishing agent for cotton fabrics to improve flame retardant and antibacterial properties”. Carbohydrate Polymers, vol. 118, pp. 83-90.
 Zhu, P., Sui, S., Wang, B., et al. (2004). ”A study of pyrolysis and pyrolysis products of flame-retardant cotton fabrics by DSC, TGA, and PY-GC-MS”. Journal of Analytical and Applied Pyrolysis, vol. 71, pp. 645–655.
 Guo, C., Zhon, L., and Lv, J. (2013). ”Effects of Expandable Graphite and Modified Ammonium Polyphosphate on the Flame-Retardant and Mechanical Properties of Wood Flour-Polypropylene Composites2. Polymers & Polymer Composites, vol 21, issue 7, pp. 449-456.
 Xu, L., Wang W., and D Yu (2017) ”Durable flame retardant finishing of cotton fabrics with halogen-free organophosphonate by UV photoinitiated thiol-ene click chemistry”. Carbohydrate Polymers, vol. 172, pp.275–283.
 Alongi, J., Ciobanu, M., Tata, J., et al. (2011) ”Thermal stability and flame retardancy of polyester, cotton, and relative blend textile fabrics subjected to sol–gel treatments”. Journal of Applied Polymer Science, vol. 119, pp.1961-1969.
 Chen, Q. and Zhao, T. (2015). ”The thermal decomposition and heat release properties of the nylon/cotton, polyester/cotton and Nomex/cotton blend fabrics”. Textile Research Journal, vol. 86, pp.1859-1868.
 Manich, A.M., and Ussman Eds., M.H. (2002). Updating the ‘cottonized’ flax processing. (Covilhã: Universidade da Beira Interio), pp 178-191.
 Davies, P.J., Horrocks, A.R., and Alderson A. (2005). ”The sensitisation of thermal decomposition of ammonium polyphosphate by selected metal ions and their potential for improved cotton fabric flame retardancy”. Polymer Degradation and Stability, vol. 88, pp. 114-122.
 Manich, A.M., Alonso, C., Pérez-Rentero, S., et al. (2019). Thermal Analysys (DSC, TGA) of textile flame retardants with lower environmental impact. AUTEX2019, 19th World Textile Conference on Textiles at the Crossroads. Ghent, Belgium.
 Siriviriyanum, A., O’Rear, E.A., and Yanumet, N. ”The effect of phosphorus content on the thermal and the burning properties of cotton fabric coated with an ultrathin film of a phosphorus-containing polymer”. Polymer Degradation and Stability, vol. 94, pp.558-565.