A Flame‐Retardant, Water Resistant, and Degradable Wood Toward Construction Application

Abstract

Wood presents excellent opportunities for sustainable urbanism as a renewable building material. Here, the chemical synthesis of a novel wood composites (3%PFeW) which owns flame‐retardance, water resistance, and degradability is investigated. The 3%PFeW is composed of porous wood framework impregnated with citric acid, 1,8‐octanediol, and the flame retardants (Fe3O4 and 2‐carboxyethyl phenyl hypophosphite (CEPPA)). The 3%PFeW's effective flame retardancy is realized by the introduction of Fe3O4 and CEPPA. Self‐extinguish phenomenon of 3%PFeW happens after being removed from flame. Moreover, 3%PFeW holds an LOI value of 27, reaching V0 flame retardant standard. The 3%PFeW exhibits exceptional water resistance, being proven by its water contact angle (100 °) as well as the low absorbed water content (only 6.5% after soaking 7 days). In addition, the wood composite shows degradable after immersion in NaOH for several days (71.37% degradation content after 7 days), which facilitates the recycling and reutilization of the wood framework after utilization. The modified wood with flame‐retardant, water resistant, and degradable capabilities shown here provides an appealing composite toward building area.

Flame-Retardant Wood Composite Based on Carboxylated Cellulose Fibers and Algal Polysaccharides

“…We have compared our work on composite wood in recent years, − as shown in Table S2. Compared to other works, the composite wood prepared by modifying PWP by etching and oxidizing and adding algal polysaccharides and metal ions was not only environmentally friendly but also had a higher LOI and a lower THR.…”