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Int. J. Mol. Sci. 2017, 18(11), 2368; doi:10.3390/ijms18112368

Lignin-Modified Carbon Nanotube/Graphene Hybrid Coating as Efficient Flame Retardant

School of Environmental and Forest Sciences (SEFS), University of Washington, 4000 15th Ave NE, Seattle, WA 98195, USA
Center of International Trade in Forest Products (CINTRAFOR), School of Environmental and Forest Sciences (SEFS), University of Washington, 4000 15th Ave NE, Seattle, WA 98195, USA
Author to whom correspondence should be addressed.
Received: 18 October 2017 / Revised: 1 November 2017 / Accepted: 5 November 2017 / Published: 8 November 2017
(This article belongs to the Special Issue The Lignin Challenge: Exploring Innovative Applications)
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To reduce fire hazards and expand high-value applications of lignocellulosic materials, thin films comprising graphene nanoplatelets (GnPs) and multi-wall carbon nanotubes (CNTs) pre-adsorbed with alkali lignin were deposited by a Meyer rod process. Lightweight and highly flexible papers with increased gas impermeability were obtained by coating a protective layer of carbon nanomaterials in a randomly oriented and overlapped network structure. Assessment of the thermal and flammability properties of papers containing as low as 4 wt % carbon nanomaterials exhibited self-extinguishing behavior and yielded up to 83.5% and 87.7% reduction in weight loss and burning area, respectively, compared to the blank papers. The maximum burning temperature as measured by infrared pyrometry also decreased from 834 °C to 705 °C with the presence of flame retardants. Furthermore, papers coated with composites of GnPs and CNTs pre-adsorbed with lignin showed enhanced thermal stability and superior fire resistance than samples treated with either component alone. These outstanding flame-retardant properties can be attributed to the synergistic effects between GnPs, CNTs and lignin, enhancing physical barrier characteristics, formation of char and thermal management of the material. These results provide great opportunities for the development of efficient, cost-effective and environmentally sustainable flame retardants. View Full-Text
Keywords: lignin; cellulose paper; flame retardancy; carbon nanomaterials lignin; cellulose paper; flame retardancy; carbon nanomaterials

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Song, K.; Ganguly, I.; Eastin, I.; Dichiara, A.B. Lignin-Modified Carbon Nanotube/Graphene Hybrid Coating as Efficient Flame Retardant. Int. J. Mol. Sci. 2017, 18, 2368.

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