Zhang Jingfa, Koubaa Ahmed, Xing Dan, Wang Haigang, Tao Yubo, Wang Xiang-Ming, Li Peng
Forests Research Institute, Université du Québec en Abitibi-Témiscamingue, Rouyn-Noranda, QC J9X 5E4, Canada.
State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.
Polymers (Basel). 2022 Jul 12;14(14):2833. doi: 10.3390/polym14142833.
The flame retardancy of wood-polymer composites significantly affects their potential applications. Thus, multilayered wood flour/high-density polyethylene (HDPE)/polycarbonate (PC) composites were prepared via thermocompression to improve the fire retardancy of wood-polymer composites in this paper. Thermal degradation behavior, flame retardancy, and flexural strengths of the resulting composites were investigated using a thermogravimetric analysis, cone calorimetry, and mechanical testing machine, respectively. Results revealed that the boric acid treatment reduced the heat release rate and total heat release of the wood flour/HDPE composites and increased their mass of residues. However, boric acid reduced the flexural strength of the resulting composites. The combustion test indicated that PC cap layers suppressed the combustion of the resulting composites via the formation of carbon layers. Adding PC layers reduced heat release and increased the flexural strength of the resulting composites. Finally, the failure mode of the multilayered wood flour/HDPE/PC composites in the three-point flexural test was simulated by finite element analysis.
木塑复合材料的阻燃性显著影响其潜在应用。因此，本文通过热压制备了多层木粉/高密度聚乙烯（HDPE）/聚碳酸酯（PC）复合材料，以提高木塑复合材料的阻燃性。分别使用热重分析、锥形量热法和机械试验机对所得复合材料的热降解行为、阻燃性和弯曲强度进行了研究。结果表明，硼酸处理降低了木粉/HDPE复合材料的热释放速率和总热释放量，并增加了其残余物质量。然而，硼酸降低了所得复合材料的弯曲强度。燃烧试验表明，PC帽层通过形成碳层抑制了所得复合材料的燃烧。添加PC层降低了热释放并提高了所得复合材料的弯曲强度。最后，通过有限元分析模拟了多层木粉/HDPE/PC复合材料在三点弯曲试验中的失效模式。
