Bamboo is an abundant and fast-growing nature material, which has been used in furniture and buildings. Its strength and fire-resistance are two critical issues for its wide applications. Herein, a high-strength and flame-retardant structural bamboo is obtained by constructing a boron nitride (BN)/graphene oxide (GO) composite nanocoating on the surface of delignified and densified bamboo (D-bamboo), abbreviated as BN/GO@D-bamboo. The two-dimensional BN nanosheets can form a layered structure on the surface of bamboo, providing bamboo with thermal dissipation and physical barrier for significantly improving its fire resistance. As a result, compared with natural bamboo and D-bamboo, the ignition time of BN/GO@D-bamboo is prolonged by 67% and 49%, the maximum heat release rate and total heat release are reduced by 59% and 40%, respectively, the smoke generation is also significantly reduced, showing an excellent flame retardancy and smoke suppression. On the other hand, GO in the composite nanocoating can form hydrogen bonding with the cellulose of bamboo, which in turn endows the coating with strong adhesion (5 B grade). Consequently, the axial tensile strength, bending strength and radial compressive strength of the BN/GO@D-bamboo are significantly improved compared with natural bamboo. Given the excellent flame retardancy and mechanical robustness of BN/GO@D-bamboo, it is expected to be a new generation high-performance sustainable structural material.

中文翻译：

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通过致密化和氮化硼/氧化石墨烯纳米涂层实现坚固且耐火的竹子

竹子是一种丰富且生长快速的天然材料，已用于家具和建筑。其强度和耐火性是其广泛应用的两个关键问题。本文通过在脱木素致密化竹材（D-bamboo）表面构建氮化硼（BN）/氧化石墨烯（GO）复合纳米涂层，得到高强度阻燃结构竹材，简称BN/GO@ D-竹子。二维BN纳米片可以在竹子表面形成层状结构，为竹子提供散热和物理屏障，显着提高其耐火性。与天然竹和D-竹相比，BN/GO@D-bamboo的着火时间分别延长了67%和49%，最大放热量和总放热量分别降低了59%和40%分别，发烟量也显着减少，表现出优异的阻燃性和抑烟性。另一方面，复合纳米涂层中的GO可以与竹纤维素形成氢键，从而赋予涂层很强的附着力（5 B级）。因此，BN/GO@D-bamboo 的轴向拉伸强度、弯曲强度和径向压缩强度与天然竹相比显着提高。鉴于BN/GO@D-bamboo优异的阻燃性和机械坚固性，它有望成为新一代高性能可持续结构材料。