Despite tremendous efforts have been dedicated to developing environmentally-friendly waterborne polyurethane (WPU) coatings from renewable biomass resources like soybean (Glycine max (L.) Merrill) oil, the fabrication of WPU coatings with high fracture toughness and flame retardancy is still challenging. In the present work, novel soybean oil-based waterborne polyurethane (SPU) coatings and the resultant films with significantly improved fracture toughness and flame retardancy as well as good deformation recovery were successfully synthesized via a chain extension technique by using [bis(2-hydroxyethyl)amino]-methyl- phosphonic acid dimethyl ester (BH) and 1,4-butane diol (BDO) as chain extenders. The structure and properties of the coatings and films were characterized systematically by FTIR, DMA, TGA, mechanical test and limiting oxygen index (LOI), etc. The results indicated that the mechanical properties of SPU films could be effectively improved by the introduction of BH, and SPU80 with 80 % BH molar ratio in the chain extenders showed remarkable improvements in mechanical properties like tensile strength (∼6.28 fold, 8.8 MPa), elongation at break (∼1.26 fold, 1510.9 %) and fracture toughness (∼4.70 fold, 64.8 MJ/m³) comparing to those of SPU20 with 20 % BH molar ratio. The incorporation of BH could delay the maximum decomposition speed of SPU films and increase char residue production. The flame retardancy of SPU films increased gradually with the BH molar content, and the LOI value of the SPU80 with 0.9 wt% phosphorus content could reach as high as 28.2 %. This work provides a new approach to develop multifunctional SPU coating with a tunable performance by incorporating phosphorus-nitrogen chain extender.

尽管付出了巨大的努力，但仍致力于从大豆等可再生生物质资源开发环保型水性聚氨酯（WPU）涂料（Glycine max（L.）Merrill）油，具有高断裂韧性和阻燃性的WPU涂层的制造仍然具有挑战性。在目前的工作中，通过使用[双（2-羟乙基）扩链技术成功地合成了新颖的大豆油基水性聚氨酯（SPU）涂料以及具有显着改善的断裂韧性和阻燃性以及良好的变形回复性的所得薄膜。 ）氨基]-甲基-膦酸二甲酯（BH）和1,4-丁二醇（BDO）作为扩链剂。通过FTIR，DMA，TGA，力学测试和极限氧指数（LOI）等对涂层和膜的结构和性能进行了系统表征。结果表明，引入BH可以有效改善SPU膜的力学性能。 ，³）与具有20％BH摩尔比的SPU20的那些相比。BH的掺入可以延迟SPU膜的最大分解速度并增加炭渣的产生。SPU薄膜的阻燃性随BH摩尔含量的增加而逐渐增加，磷含量为0.9 wt％的SPU80的LOI值可高达28.2％。通过结合磷氮扩链剂，这项工作提供了一种开发具有可调性能的多功能SPU涂层的新方法。