Abstract

Polybenzoxazine, a new kind of phenolic materials, have the properties of dimensional and thermal stability and do not release any by-products during its curing process, so polybenzoxazine has shown potential for anti-corrosion coating application. In this study, urushiol, a natural phenol obtained from lacquer, was successfully utilized to synthesize a novel urushiol-benzoxazine monomer (UB) via Mannich-like condensation with paraformaldehyde and triethylenetetramine, then the novel benzoxazine monomers were modified by γ-(2,3-epoxypropoxy)propytrimethoxysilane, the structures of UB and urushiol-benzoxazine modified by silane (UBSi) were characterized by Fourier transform infrared spectroscopy (FT-IR) and ¹H NMR spectroscopy, and the results of differential scanning calorimetry (DSC) indicated that the ring-opening polymerization temperature of the benzoxazine modified by silane occurred at approximately 210 °C, lower than that of unmodified benzoxazine. Thermal gravimetric analysis (TGA) measurements showed that the temperatures corresponding to 10 and 50% weight loss (T₁₀ and T₅₀) of UB were 354 and 417 °C, respectively; however, the corresponding values of UBSi were 377 and 436 °C. Strain-stress tests indicated that the failure values of strain and stress of UB were 17.27% and 11.45 Mpa, and the corresponding values of UBSi were 14.82% and 12.21 Mpa, respectively. The water absorption of UB curing coating is 3.75%, while that of UBSi30 curing coating drops to 1.27%.

摘要

聚苯并恶嗪是一种新型的酚醛材料，具有尺寸和热稳定性，在固化过程中不会释放任何副产物，因此聚苯并恶嗪已显示出在防腐涂料中的应用潜力。在这项研究中，漆漆中的天然酚醛酚成功地通过曼尼希样与多聚甲醛和三亚乙基四胺的缩合反应成功地合成了一种新型的酚醛苯并恶嗪单体（UB），然后通过γ-（2，通过傅立叶变换红外光谱（FT-IR）表征了3-环氧丙氧基）丙三甲氧基硅烷，UB和被硅烷（UBSi）修饰的漆酚-苯并恶嗪的结构，¹1 H NMR光谱和差示扫描量热法（DSC）的结果表明，经硅烷改性的苯并恶嗪的开环聚合温度为约210℃，低于未改性的苯并恶嗪的开环聚合温度。热重分析（TGA）测量结果表明，与UB的₁₀％和50％重量损失（T ₁₀和T ₅₀）相对应的温度分别为354和417°C。但是，UBSi的相应值为377和436°C。应变测试表明，UB的应变破坏值和应力破坏值分别为17.27％和11.45 Mpa，相应的UBSi值分别为14.82％和12.21 Mpa。UB固化涂料的吸水率为3.75％，而UBSi30固化涂料的吸水率降至1.27％。