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. AlongiPrimo
Methodology
;A. ManfrediWriting – Review & Editing
;P. FerrutiPenultimo
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.File | Dimensione | Formato | |
---|---|---|---|
Manuscript_Ranucci_revised.pdf
accesso aperto
Tipologia:
Pre-print (manoscritto inviato all'editore)
Dimensione
9.11 MB
Formato
Adobe PDF
|
9.11 MB | Adobe PDF | Visualizza/Apri |
1-s2.0-S0141391023001805-main.pdf
accesso riservato
Tipologia:
Publisher's version/PDF
Dimensione
14.01 MB
Formato
Adobe PDF
|
14.01 MB | Adobe PDF | Visualizza/Apri Richiedi una copia |
1-s2.0-S0141391023001805-main_compressed.pdf
accesso riservato
Tipologia:
Publisher's version/PDF
Dimensione
808.15 kB
Formato
Adobe PDF
|
808.15 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.