Abstract
Wood/thermoplastic composites (WPCs) have been restricted in some fields of building construction and electrical equipment because of their inherent high flammability and lower toughness. In this work, a branched crosslinking network polyelectrolyte complex (PEC) has been designed by incorporation of polyethyleneimine (PEI), a cation polyelectrolyte end capped amine groups, into cellulose nanocrystals (CNC), and ammonium polyphosphate (APP) via self-assembling. The hydrogen bonding interactions, penetration, and mechanical interlock provided by PEC effectively enhance the interfacial bonding within matrix, wood fibers, and flame retardant. Interestingly, it generates abundant micropores on the inner structure of WPC. The excellent interfacial bonding performance and easy-to-move molecular chain successfully transfer the stress and induce energy dissipation, simultaneously giving rise to higher strength and toughness for WPC. As well as the PEC endows WPC with a promotion in both smoke suppression and UL-94 V-0 rate. Additionally, the peak heat release rate and total smoke release for WPC obviously reduce by 36.9% and 50.0% respectively in presence of 25% PEC. A simple, eco-friendly, and concise strategy exhibits prospects for fiber-reinforced polymer composites with effective flame retardancy and mechanical robust properties.
Highlights
Wood/plastic composites (WPCs) have been widely applied in decking, garden decoration, and packaging materials for their prominent mechanical performance, outstanding water resistance, and environmental friendliness [1]
A simple, eco-friendly, and concise strategy is needed for higher performance WPCs with the efficient flame retardancy and prominent toughness
M2 ·g−1 ), which makes it easy to disperse in water to form a chiral nematic structure [12]
Summary
Wood/plastic composites (WPCs) have been widely applied in decking, garden decoration, and packaging materials for their prominent mechanical performance, outstanding water resistance, and environmental friendliness [1]. The inherent high flammability of WPC, which has a low limited oxygen index (LOI) of only 19.5–20.2% [2,3], limits its potential applications in decoration, furniture, building construction, and electrical equipment. There are still some restrictions in demand of a large amount of organic solvents, and imbibition of toughness and insufficient flame retardancy of WPCs. a simple, eco-friendly, and concise strategy is needed for higher performance WPCs with the efficient flame retardancy and prominent toughness.
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