Linear polyamidoamines (PAAs) derived from the polyaddition of natural  -amino acids and N,N'-methylene bis(acrylamide) are intumescent flame retardants for cotton. Among them, the glycine-derived M-GLY extinguished the flame in horizontal flame spread tests at 4% by weight add-on. This paper reports on an extensive study aimed at understanding the molecular-level transformations of M-GLY-treated cotton upon heating in air at 300  °C, 350  °C and 420  °C. Thermogravimetricanalysis (TGA) identified different thermal-oxidative decomposition stages and, coupled to Fourier transform infrared spectroscopy, allowed the volatile species released upon heating to be determined, revealing differences in the decomposition pattern of treated and untreated cotton. XPS analysis of the char residues of M-GLY-treated cotton revealed the formation of aromatic nanographitic char at lower temperature with respect to untreated cotton. Raman spectroscopy of the char residues provided indications on the degree of graphitization of treated and untreated cotton at the three reference temperatures. Solid state 13C nuclear magnetic resonance spectroscopy (NMR) provided information on the char structure as a function of the treatment temperature, clearly indicating that M-GLY favors the carbonization of cotton with the formation of more highly condensed aromatic structures.

The Thermo-Oxidative Behavior of Cotton Coated with an Intumescent Flame Retardant Glycine-Derived Polyamidoamine: A Multi-Technique Study / C. Forte, J. Alongi, A. Beduini, S. Borsacchi, L. Calucci, F. Carosio, P. Ferruti, E. Ranucci. - In: POLYMERS. - ISSN 2073-4360. - 13:24(2021 Dec 14), pp. 4382.1-4382.14. [10.3390/polym13244382]

The Thermo-Oxidative Behavior of Cotton Coated with an Intumescent Flame Retardant Glycine-Derived Polyamidoamine: A Multi-Technique Study

J. Alongi
Secondo
Conceptualization
;
A. Beduini
Investigation
;
P. Ferruti
Penultimo
Conceptualization
;
E. Ranucci
Ultimo
Conceptualization
2021

Abstract

Linear polyamidoamines (PAAs) derived from the polyaddition of natural  -amino acids and N,N'-methylene bis(acrylamide) are intumescent flame retardants for cotton. Among them, the glycine-derived M-GLY extinguished the flame in horizontal flame spread tests at 4% by weight add-on. This paper reports on an extensive study aimed at understanding the molecular-level transformations of M-GLY-treated cotton upon heating in air at 300  °C, 350  °C and 420  °C. Thermogravimetricanalysis (TGA) identified different thermal-oxidative decomposition stages and, coupled to Fourier transform infrared spectroscopy, allowed the volatile species released upon heating to be determined, revealing differences in the decomposition pattern of treated and untreated cotton. XPS analysis of the char residues of M-GLY-treated cotton revealed the formation of aromatic nanographitic char at lower temperature with respect to untreated cotton. Raman spectroscopy of the char residues provided indications on the degree of graphitization of treated and untreated cotton at the three reference temperatures. Solid state 13C nuclear magnetic resonance spectroscopy (NMR) provided information on the char structure as a function of the treatment temperature, clearly indicating that M-GLY favors the carbonization of cotton with the formation of more highly condensed aromatic structures.
linear polyamidoamines; cotton thermal oxidative decomposition; char; 13C MAS NMR; Raman; XPS
Settore CHIM/04 - Chimica Industriale
PSR2015-1715FDEMA_M - PIANO DI SOSTEGNO ALLA RICERCA 2015-2017 - LINEA 2 "DOTAZIONE ANNUALE PER ATTIVITA' ISTITUZIONALE" - DEMARTIN, FRANCESCO - PSR2015-17 - Piano di sviluppo di ricerca 2015-17 - 2015
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/890429
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