To improve the flame retardancy of bamboo materials, layer by layer (LbL) self-assembly with phytic acid (PA)-polyethyleneimine (PEI) on the surface of shaving super bamboo specimens with different solution concentrations of PA-PEI and times of LbL self-assembly was completed in this study. Results of Fourier transform infrared analysis showed that PEI was well assembled to the surface of bamboo specimens by hydrogen bond with PA as intermediation. Application of PA and PEI significantly promoted the formation of carbon residue as illustrated in the simultaneous thermal measurements. Specifically, the peak heat release rate of bamboo specimens self-assembled with 10 wt.% PA and 10 wt.% PEI solution for 5 times was 19.36% smaller and total heat release was 22.30% smaller than the control in a cone calorimeter analysis. The treated bamboo specimen showed increases of 35.56% and 480.70% in fire performance index and residual mass, respectively, compared to the control. Besides, yields of CO and CO2 were decreased by 17.77% and 17.07% in comparison with the control, respectively. LbL self-assembly with PA-PEI promoted the generation of residual char layer with excellent stability, can effectively improve the flame retardancy of bamboo materials.

中文翻译：

---

植酸-聚乙烯亚胺层层自组装剃须超级竹的阻燃性评价

为提高竹材的阻燃性，采用植酸（PA）-聚乙烯亚胺（PEI）在不同PA-PEI溶液浓度和LbL自倍数的剃须超级竹标本表面逐层（LbL）自组装-本研究已完成组装。傅里叶变换红外分析结果表明，PEI 通过以 PA 为中介的氢键很好地组装到竹材表面。PA 和 PEI 的应用显着促进了残炭的形成，如同时热测量所示。具体而言，在锥形量热仪分析中，用 10 wt.% PA 和 10 wt.% PEI 溶液自组装的竹标本的峰值放热率比对照小 19.36%，总放热量小 22.30%。与对照相比，处理过的竹标本的防火性能指数和残留质量分别增加了 35.56% 和 480.70%。此外，与对照相比，CO和CO2的产率分别降低了17.77%和17.07%。LbL与PA-PEI的自组装促进了具有优异稳定性的残留炭层的产生，可有效提高竹材的阻燃性。