The role of metal ions in improving the flame resistance of cotton prompted to investigate whether adding CaCl2 to the glycine-derived polyamidoamine M-GLY, an excellent intumescent flame retardant for cotton, increased its efficacy in this respect. Thermogravimetric analysis demonstrated a superior thermo-oxidative stability of cotton when treated with M-GLY/CaCl2 mixtures, particularly above 550◦C, compared to cotton treated with either MGLY or CaCl2, suggesting that they act synergistically. In horizontal flame spread tests, M-GLY/CaCl2 coatings proved to be even more efficient than M-GLY coatings. In vertical flame spread tests (VFSTs), where M-GLY failed to protect cotton even at add-ons >30%, M-GLY/CaCl2 coatings with add-ons 7% and 2%, respectively, inhibited cotton ignition producing only modest afterglow, and leaving an 82% residue. No other amino acid-derived polyamidoamine, except those containing disulfide groups, has proved as efficient in VFSTs, even at much higher add-ons. The set of data reported here prompts that the ionic interactions of calcium ions with the carboxylate groups of M-GLY induce the formation of even larger amounts of char compared to M-GLY and lets envisaging a synergistic action of these two components. This finding paves the way for the study of new polyamidoamine-based organic/inorganic flame retardants for cotton.

Use of calcium chloride to enhance the efficacy of polyamidoamines as flame retardants for cotton / J. Alongi, R. Aad, A. Manfredi, F. Carosio, P. Ferruti, E. Ranucci. - In: POLYMER DEGRADATION AND STABILITY. - ISSN 0141-3910. - 215:(2023 Sep), pp. 110428.1-110428.11. [10.1016/j.polymdegradstab.2023.110428]

Use of calcium chloride to enhance the efficacy of polyamidoamines as flame retardants for cotton

J. Alongi
Primo
Methodology
;
A. Manfredi
Writing – Review & Editing
;
P. Ferruti
Penultimo
Conceptualization
;
E. Ranucci
Ultimo
Conceptualization
2023

Abstract

The role of metal ions in improving the flame resistance of cotton prompted to investigate whether adding CaCl2 to the glycine-derived polyamidoamine M-GLY, an excellent intumescent flame retardant for cotton, increased its efficacy in this respect. Thermogravimetric analysis demonstrated a superior thermo-oxidative stability of cotton when treated with M-GLY/CaCl2 mixtures, particularly above 550◦C, compared to cotton treated with either MGLY or CaCl2, suggesting that they act synergistically. In horizontal flame spread tests, M-GLY/CaCl2 coatings proved to be even more efficient than M-GLY coatings. In vertical flame spread tests (VFSTs), where M-GLY failed to protect cotton even at add-ons >30%, M-GLY/CaCl2 coatings with add-ons 7% and 2%, respectively, inhibited cotton ignition producing only modest afterglow, and leaving an 82% residue. No other amino acid-derived polyamidoamine, except those containing disulfide groups, has proved as efficient in VFSTs, even at much higher add-ons. The set of data reported here prompts that the ionic interactions of calcium ions with the carboxylate groups of M-GLY induce the formation of even larger amounts of char compared to M-GLY and lets envisaging a synergistic action of these two components. This finding paves the way for the study of new polyamidoamine-based organic/inorganic flame retardants for cotton.
polyamidoamines; intumescent flame retardants; calcium chloride; functional coatings; cotton;
Settore CHIM/04 - Chimica Industriale
set-2023
2-giu-2023
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/979968
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