1. Phytic Acid-based NP Fire Retardant and its Effect on Combustion Property of Poplar Wood
- Author
-
Shenglei Qin, Yangguang Liu, Xin Shi, Xiaoshuang Shen, Demiao Chu, and Shengquan Liu
- Subjects
nitrogen ,phosphorus ,coordination ,wood flame retardant ,phytic acid ,graphitization degree ,Biotechnology ,TP248.13-248.65 - Abstract
To enhance the synergistic effect of phosphorus (P) and nitrogen (N) on flame retardant property, four different phytic acid-based NP flame retardants (FR-PAN) were manufactured using phytic acid and urea with various molar ratios, ranging from 1:3 to 1:12. The FR-PAN water solution was used to impregnate poplar wood under vacuum condition, and the thermal degradation performance of the FR-PAN treated wood were investigated. Compared to untreated wood, the PAN-6 (molar ratio is 1:6) group showed a reduction of 57.1% in total heat release and 80.0% in total smoke release. In the combustion, due to the introduction of P and N, FR-PAN generates O=P/C-O/C-P/C-N bonds, forming highly graphitized char residues, which effectively isolate the entry of oxygen and heat and play a good protective role in the condensed phase. Morphological and chemical analysis of the residual char layer revealed that the introduction of P and N elements formed a more stable hybrid structure, significantly improving the thermal stability of the char layer. Among them, the PAN-6 group exhibited the highest char layer stability, indicating optimal synergistic effects of nitrogen and phosphorus under these conditions.
- Published
- 2023