An eco-friendly cellulose-based flame retardant with high expansibility and carbonization efficiency
writer：Xuefei Chen, Yunyun Zhang, Hou-Yong Yu
keywords：Nanocrystalline materials, Thermal properties, Char residue, Expansion property, Flame retardancy
source：期刊
Issue time：2023年
Cellulose nanocrystals (CNCs) with flame-retardant property attract considerable attention as multifunctional reinforcing nanofillers for the polymers. Herein, a novel eco-friendly CNC-based (CTP) flame retardancy (FR) had been developed by modifying CNC with tannic acid (TA) and phytic acid (PA). The CTP with spherical morphology displayed good thermal stability and high char residue up to 59.3 % at 600 ?C. Notably, the CTP can be carbonized rapidly to form the dense and continuous intumescent char layer, which height increased from 2mm to 16 mm. The quick dehydration and carbonization of TA under the catalysis of PA contributed to the high expansibility and carbonization efficiency of CTP. The formation of intumescent char layer acted as a strong barrier, significantly improving the flame retardancy and inhibiting the dense smoke release. This eco-friendly and high flame-retardant CNC-based FRs can be widely used for developing multifunctional polymers.