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Synergistic Flame Retardant Effects of Carbon Nanotube‐Based Multilayer Nanocoatings
Author(s) -
Kim Jinhong,
Jang Junho,
Yun Sehui,
Kim Hyeon Deok,
Byun You Young,
Park Yong Tae,
Song Jung Il,
Cho Chungyeon
Publication year - 2021
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.202100233
Subject(s) - materials science , fire retardant , carbon nanotube , nanocomposite , polyaniline , coating , composite material , polyurethane , thermal stability , chemical engineering , polymer , polymerization , engineering
Abstract In an effort to develop highly functionalized flame retardant materials, hybrid nanocoatings are prepared by alternately depositing a positively charged polyaniline (PANi) and negatively charged montmorillonite (MMT) using the layer‐by‐layer (LbL) assembly technique. Carbon nanotubes (CNTs) are employed in polymer nanocomposites as effective reinforcement, where nanotubes are stabilized in MMT aqueous solution. The 3D structure and high density of CNTs deposited in the PANi/CNTs‐MMT multilayers produce thicker and heavier coatings in comparison to the LbL assemblies without CNTs. Vertical and horizontal flame testing show that the incorporation of CNTs improves fire resistance. Additionally, cone calorimetry reveals that stacking two nanomaterials (MMT and CNTs) in a single coating shows a significant reduction in peak heat release rate (up to 51%), total smoke release (up to 47%), and total heat release (up to 37%) for the polyurethane foam. The enhancement of flame retardancy is attributed to a synergistic effect; MMT serves as a physical barrier that retards the diffusion of heat and gas. The addition of CNTs strengthens the thermal stability and high char yield. These results, coupled with the simplicity with which the LbL deposition is applied, present a viable alternative to halogen‐free flame retardant nanocoatings to natural and synthetic fibers.