Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 46, Pages 40782-40791Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b09863
Keywords
cotton; fabric; flame retardant; vertical flame test; pyrolysis combustion flow calorimetry; wash fastness
Funding
- JTC Corporation and Building Construction and Authority (BCA), Singapore [RCA-16/277, BCA RID 94.18.2.3]
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In this Research Article, we report on the development of water-based flame retardant coating based on phosphonitrogen combination for cotton fabrics. A one-step spray-on process was employed to coat the fabrics by taking advantage of the spontaneous reaction between para-phenylenediamine (PDA) and tetrakis(hydroxymethyl)phosphonium chloride (THPC) resulting in an instantaneous precipitation of poly[1,4-diaminophenylene-tris(dimethyl hydroxymethyl)phosphine] (PApP) on the fabric surface. The effectiveness of PApP in improving the flame retardant properties like ignition resistance and lateral flame spread were evaluated in accordance with ASTM D6413 and BS EN ISO 15025 flammability tests. Despite the early (thermal) decomposition onset for coated fabrics under both oxidative and pyrolytic conditions, remarkably, self -extinguishing behavior (<3 s) without any lateral flame spread was observed. Possible reaction scheme was also proposed to correlate flame retardant mechanism of the coated fabrics with the observations. Additional analysis via pyrolysis combustion flow calorimetry and vertical flame testing before and after washing showed that flame retardant efficiency did decrease with washing, but the overall performance was still promising.
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