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Sulfur-Based Copolymeric Polyamidoamines as Efficient Flame-Retardants for Cotton
Alessandro Beduini1, Federico Carosio2, Paolo Ferruti1
1Dipartimento di Chimica, Università degli Studi di Milano, via C. Golgi 19, 20133 Milano, Italy.
Polymers
|November 23, 2019
Summary
Flame-retardant (FR) copolymers combining glycine and cystine units show enhanced cotton fire protection. These M-Gm-Cn copolymers effectively extinguish flames in both horizontal and vertical tests, outperforming simple blends.
Area of Science:
- Materials Science
- Polymer Chemistry
- Fire Retardancy
Background:
- Polyamidoamines M-G and M-C exhibit distinct flame-retardant (FR) properties.
- M-G is effective in horizontal flame spread tests (HFST) via intumescence.
- M-C is effective in vertical flame spread tests (VFST) through radical scavenging.
Purpose of the Study:
- To compare the FR effectiveness of M-Gm-Cn copolymers against homopolymers and blends.
- To evaluate performance in both HFST and VFST.
- To determine if copolymers combine the benefits of both homopolymers.
Main Methods:
- Synthesis of M-Gm-Cn copolymers with varying glycine (G) and cystine (C) ratios.
- Testing FR performance of copolymers, homopolymers (M-G, M-C), and blends (M-G/M-C) in HFST and VFST.
- Quantification of flame extinguishment and inhibition at different add-on percentages.
Main Results:
- Both copolymers and blends extinguished flames in HFST, with M-G50-C50 and (M-G/M-C)50/50 effective at 7% add-on.
- Copolymers with ≥50% M-C units inhibited combustion in VFST at 16% add-on, similar to M-C.
- M-G/M-C blends failed to inhibit combustion in VFST at the same add-on percentage.
Conclusions:
- M-Gm-Cn copolymers demonstrate superior flame-retardant performance compared to blends.
- Copolymers successfully integrated the flame-retardant mechanisms of both M-G and M-C.
- These copolymers offer a promising approach for enhanced cotton fire safety across different fire test conditions.
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