A branched urushiol analogue (CBCP) was first prepared by a ring-opening reaction of a benzoxazine containing a phosphazene core with renewable cardanol under solvent-free and catalyst-free conditions. The structure of CBCP was identified using nuclear magnetic resonance (¹H NMR, ¹³C NMR, ³¹P NMR) and Fourier transform infrared spectroscopy (FTIR) technique. The preparation process for the cured CBCP film was simple, and the curing reaction of CBCP was monitored using differential scanning calorimetry (DSC) and FTIR methods. CBCP undergoes cross-linking under ambient conditions, resulting in polymeric films (artificial urushi) that are optically transparent, scratch-free and wrinkle-free. The cured film, with a high hardness and glossy surface, showed excellent thermal, excellent adhesion to the metal substrates and good chemical resistances due to strong hydrogen-bonding interactions and a compact, highly cross-linking structure containing a hard phosphazene core. Interestingly, the limited oxygen index (LOI) of cured film is 30, suggesting that the artificial urushi has flame retardant performance.

首先在无溶剂和无催化剂的条件下，通过使含磷腈核心的苯并恶嗪与可再生腰果酚开环反应，制备支链漆酚类似物（CBCP）。CBCP的结构通过核磁共振（¹ H NMR，¹³ C NMR，³¹核磁共振和傅里叶变换红外光谱（FTIR）技术。固化的CBCP膜的制备过程很简单，并且使用差示扫描量热法（DSC）和FTIR方法监测了CBCP的固化反应。CBCP在环境条件下进行交联，从而形成光学透明，无划痕和无皱纹的聚合物膜（人造漆皮）。具有强硬度和光亮表面的固化膜由于强的氢键相互作用和包含硬磷腈核的紧密，高度交联的结构，具有出色的耐热性，对金属基材的优异粘合性和良好的耐化学性。有趣的是，固化膜的极限氧指数（LOI）为30，这表明人造漆具有阻燃性能。