Preparation of low dielectric thermosetting resins by green method is a challenging subject. Herein, unique bio-based benzoxazine monomer E-dea was prepared by a solvent-free method using eugenol as phenol source, and then E-dea and bismaleimide (BMI) were copolymerized to prepare poly(E-dea/BMI-0.86) and poly(E-dea/BMI-1). The comprehensive properties including thermal, mechanical and dielectric properties of the copolymers were studied. Notably, poly(E-dea/BMI-0.86) and poly(E-dea/BMI-1) exhibit low dielectric properties with dielectric constants of 2.85 and 2.79 at 1 MHz, respectively. Besides, the glass transition temperature (T_g), the initial thermal decomposition temperature (T_di) and the flexural strength of poly(E-dea/BMI-0.86) and poly(E-dea/BMI-1) are 167 °C and 169 °C, 333 °C and 321 °C and 115 ± 3.5 MPa and 123 ± 4.9 MPa, respectively. The excellent comprehensive performance is attributed to the interaction between flexible and low dielectric decane segments and rigid oxazine and BMI segments.

绿色法制备低介电热固性树脂是一个具有挑战性的课题。在此，以丁香酚为苯酚源，采用无溶剂法制备独特的生物基苯并恶嗪单体E-dea ，然后将E-dea与双马来酰亚胺（BMI）共聚制备聚（E-dea/BMI-0.86）和聚（E-dea/BMI-1）。研究了共聚物的热性能、力学性能和介电性能等综合性能。值得注意的是，poly(E-dea/BMI-0.86)和poly(E-dea/BMI-1)表现出低介电性能，在 1 MHz 下的介电常数分别为 2.85 和 2.79。此外，玻璃化转变温度_（ Tg)，聚(E-dea/BMI-0.86)和聚(E-dea/BMI-1)的初始热分解温度( T _di )和抗弯强度分别为167°C和169°C、333°C和分别为 321 °C 和 115 ± 3.5 MPa 和 123 ± 4.9 MPa。优异的综合性能归因于柔性和低介电癸烷链段与刚性恶嗪和BMI链段之间的相互作用。