This study focuses on the synthesis, thermal and dielectric properties of sustainable bio-phenol viz. thymol based polybenzoxazines for applications including low dielectric, high dielectric and water repellent coating applications. By following a simple one-pot method four unique set of thymol benzoxazines were synthesized using varied nature of amines such as laurylamine (l), stearylamine (s), aniline (a), fluoroaniline (f), trifluoromethylaniline (t), cyclohexylamine (c), allylamine (aa), furfurylamine (ff), Jeffmine D₂₃₀ (j), isophoronediamine (i), methylenebis cyclohexylamine (m), diaminodiphenylmethane (dm), p-phenylenediamine (pp) and diaminodiphenylether (de). The synthesized four set of thymol benzoxazines have been studied for range of applications viz., water repellent coating on cotton fabrics (CFs), low and high k insulation applications. Char yield value of poly(T-de) has been noted as 40% which is greater than the rest of the other synthesized thymol based polybenzoxazines. Amidst the different benzoxazines, highest water contact value (146°) was noticed for poly(T-t). Poly(T-t) coated cotton fabric (CCF) exhibits the super-hydrophobic behavior, which shows the water repellent value of 163°. The 15 wt% of palm-flower silica (PFS) reinforced poly(T-ff) composites showed the lowest dielectric constant value of 2.01 with loss factor of 0.0024. Similarly, high k value of 7.80 with loss factor of 0.0021 achieved for 15 wt% of C-gn incorporated poly(T-de). The results from the different studies, the developed thymol polybenzoxazines and composites exhibited an excellent thermal and dielectric properties, making them suitable for sustainable, versatile coatings and microelectronics applications.

本研究重点关注可持续生物酚的合成、热学和介电性能。基于百里酚的聚苯并恶嗪，适用于低介电、高介电和防水涂料应用。通过遵循简单的一锅法，使用不同性质的胺合成了四组独特的百里酚苯并恶嗪，例如月桂胺（l）、硬脂胺（s）、苯胺（a）、氟苯胺（f）、三氟甲基苯胺（t）、环己胺（ c)、烯丙胺 (aa)、糠胺 (ff)、Jeffmine D₂₃₀(j)、异佛尔酮二胺 (i)、亚甲基双环己胺 (m)、二氨基二苯基甲烷 (dm)、p-苯二胺 (pp) 和二氨基二苯醚 (de)。合成的四组百里酚苯并恶嗪已被研究用于各种应用，即棉织物（CF）上的防水涂层、低和高 k 绝缘应用。聚(T-de)的炭产率为40%，高于其他合成的百里酚基聚苯并恶嗪。在不同的苯并恶嗪中，聚（Tt）的水接触值最高（146°）。Poly(Tt)涂层棉织物(CCF)表现出超疏水行为，拒水值为163°。15 wt% 的棕榈花二氧化硅 (PFS) 增强聚 (T-ff) 复合材料表现出最低的介电常数值为 2.01，损耗因子为 0.0024。同样，对于 15 wt% 的 C-gn 掺入聚（T-de），可实现 7.80 的高 k 值和 0.0021 的损耗因子。不同研究的结果表明，所开发的百里酚聚苯并恶嗪和复合材料表现出优异的热性能和介电性能，使其适合可持续、多功能的涂料和微电子应用。