Bio‐Sourced Intumescent Nanocoating

Smith, Dallin; Vest, Natalie A.; Rodriguez‐Melendez, Danixa; Palen, Bethany; Grunlan, Jaime C.

doi:10.1002/adem.202200911

Cited by 12 publications

(1 citation statement)

References 57 publications

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“…To establish an effective flame retardant coating on fabric, polyelectrolyte complexation via layer-by-layer (LbL) assembly has been used as a postmanufactured alternative. In layer-by-layer assembly, the substrate is alternately dipped in individual solutions of oppositely charged components, with the pH adjusted to induce ionic interactions or hydrogen bonding, until a desired weight gain or property is achieved. − LbL assembled films have been used in a multitude of applications, including dielectrics, , gas barriers, − and flame retardants. − In the present work, increasing concentrations of a boron additive are used in conjunction with a layer-by-layer coating of poly(allylamine hydrochloride) and poly(sodium phosphate) to render cotton fabric self-extinguishing. With the addition of APB, cotton is rendered flame retardant, reducing the total heat release by 70% and the fire growth capacity by 88%.…”

Section: Introductionmentioning

confidence: 99%

Boron Improved High Limiting Oxygen Index Polyelectrolyte Treatment for Cotton

Vest,

Convento,

Rodriguez-Melendez

et al. 2023

ACS Appl. Eng. Mater.

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The flammability of cotton fabric poses a risk of injury and death, specifically in aerospace applications, where oxygen concentrations are higher than typical atmospheric conditions. In an effort to reduce its flammability in high-oxygen environments, cotton was treated with a 12bilayer coating consisting of poly(allylamine hydrochloride) (PAH), poly(sodium phosphate) (PSP), and ammonium pentaborate tetrahydrate (APB). With a formulation of 6.5% PAH/8% PSP+5% APB, cotton is rendered self-extinguishing, exhibiting a reduction in peak heat release and fire growth capacity of 72 and 88%, respectively. Moreover, cotton remains self-extinguishing in highly oxygenated environments, having a limiting oxygen index of 35.5%. This layer-by-layer assembled coating operates via an intumescent mechanism that is aided by the formation of borate esters cross-linking the char structure, resulting in reduced gas diffusion and increased thermal stability. This unique, scalable treatment is especially promising for space exploration and could potentially be used in other polymeric materials.

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