The polyamidoamine derived from N,N'-methylenebisacrylamide (M) and glycine (G), M-G, has been shown to be an effective flame-retardant (FR) for cotton in horizontal flame spread tests (HFST), extinguishing the flame at 5% add-on. Its activity was attributed to its intrinsic intumescence. In vertical flame spread tests (VFST), M-G failed to extinguish the flame even at 30% add-on. Conversely, in VFST, the polyamidoamine derived from M and cystine (C), M-C, inhibited cotton combustion at 16% add-on, but in HFST failed to extinguish the flame below 12% add-on. Its activity was ascribed to the release of sulfur-containing volatiles acting as radical scavengers. In this work, the FR effectiveness of M-Gm-Cn copolymers with different G/C ratio was compared with that of the M-G and M-C homopolymers and of M-G/M-C blends of the same compositions. In HFST, both copolymers and blends extinguished the flame. In particular, M-G50-C50 and (M-G/M-C)50/50 extinguished the flame, even at 7% add-on. In VFST, the copolymers with ≥50% M-C units, similar to M-C, inhibited cotton combustion at 16% add-on. At the same add-on, the M-G/M-C blends failed to extinguish the flame. It may be concluded that, in contrast to blends, copolymers combined the merits of both homopolymers in all tests.
Sulfur-based copolymeric polyamidoamines as efficient flame-retardants for cotton / A. Beduini, F. Carosio, P. Ferruti, E. Ranucci, J. Alongi. - In: POLYMERS. - ISSN 2073-4360. - 11:11(2019 Nov 19), pp. 1904.1-1904.22.
|Titolo:||Sulfur-based copolymeric polyamidoamines as efficient flame-retardants for cotton|
FERRUTI, PAOLO [Conceptualization]
RANUCCI, ELISABETTA (Penultimo) [Conceptualization]
ALONGI, JENNY (Ultimo) [Conceptualization] (Corresponding)
|Parole Chiave:||Cystine; cotton; Flame-retardants; Functional coatings; Sulfur-based polyamidoamine copolymers|
|Settore Scientifico Disciplinare:||Settore CHIM/04 - Chimica Industriale|
|Data di pubblicazione:||19-nov-2019|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.3390/polym11111904|
|Appare nelle tipologie:||01 - Articolo su periodico|