The entanglement disorder, highly polar groups and carbon-rich structure of conventional epoxy resins result in high dielectric constants and flammability, posing challenges to the development of high-frequency communications. Therefore, a silicone-containing active ester curing agent (FMAE) derived from magnolol was synthesized via a straightforward two-step process. And a thermosetting resin (FMAE/TGDDM) was then obtained by moisture self-cross-linking as well as curing epoxy N, N, N, N-tetraethoxypropyl-4, 4-diaminodiphenylmethane (TGDDM). The epoxy resin (MAE/TGDDM) cured by MAE that was not undergoing click chemistry was used for comparison. The results showed that the large volume of curing agents (31.86 Å × 14.98 Å × 9.03 Å for FMAE, 16.01 Å × 11.46 Å × 8.09 Å for MAE) and the absence of –OH enabled both resins to have excellent dielectric properties, especially FMAE/TGDDM, with a Dk of 2.78 and a Df of 0.0066 at 10 MHz. Additionally, FMAE/TGDDM demonstrated favorable impact resistance (43.9 kJ/m2) and lower hygroscopicity (0.56%) than MAE/TGDDM, which due to the introduction of siloxane chain (Si% = 7.08%) and the increase of the crosslinking density (2302 mol/cm3 vs 6751 mol/cm3). Furthermore, the charring rate of FMAE/TGDDM was 39.1%, almost twice that of MAE/TGDDM, and the PHHR and THR were 201.2 W/g and 22.6 kJ/g, 103.9% and 67.7% lower than MAE/TGDDM, respectively, proving that the intrinsic flame retardancy of FMAE/TGDDM. Hence, this paper provides a strategy to synergistically address the limitations of TGDDM and conventional epoxy resins for impact resistance, dielectric properties and flame retardancy through a simple structural design.

中文翻译：

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源自厚朴酚的含硅氧烷环氧树脂，具有低介电性能、优异的韧性和阻燃性


传统环氧树脂的纠缠无序、高极性基团和富碳结构导致高介电常数和易燃性，对高频通信的发展提出了挑战。因此，通过简单的两步法合成了源自厚朴酚的含硅活性酯固化剂（FMAE）。然后通过湿气自交联以及固化环氧N,N,N,N-四乙氧基丙基-4,4-二氨基二苯甲烷(TGDDM)得到热固性树脂(FMAE/TGDDM)。使用未经过点击化学的 MAE 固化的环氧树脂 (MAE/TGDDM) 进行比较。结果表明，大体积的固化剂（FMAE为31.86 Å × 14.98 Å × 9.03 Å，MAE为16.01 Å × 11.46 Å × 8.09 Å）和不含-OH使两种树脂都具有优异的介电性能，尤其是FMAE /TGDDM，10 MHz 时 Dk 为 2.78，Df 为 0.0066。此外，FMAE/TGDDM 比 MAE/TGDDM 表现出良好的抗冲击性（43.9 kJ/m2）和更低的吸湿性（0.56%），这是由于硅氧烷链的引入（Si% = 7.08%）和交联密度的增加（ 2302 摩尔/立方厘米与 6751 摩尔/立方厘米）。此外，FMAE/TGDDM的炭化率为39.1%，几乎是MAE/TGDDM的两倍，PHHR和THR分别为201.2 W/g和22.6 kJ/g，分别比MAE/TGDDM低103.9%和67.7%。证明了FMAE/TGDDM的固有阻燃性。因此，本文提出了一种策略，通过简单的结构设计来协同解决TGDDM和传统环氧树脂在抗冲击性、介电性能和阻燃性方面的局限性。