Two functional monomers containing thermo-crosslinkable benzocyclobutene and allyl groups and a bisphenol unit as a linker have been successfully synthesized. Powder X-ray diffraction indicates the monomers keep a complete amorphous state. DSC traces exhibit that the monomers have no melting point while display glass transition. Casting the solutions of the monomers in toluene into the surface of glass sheets forms smooth films. These data imply these monomers are molecular glasses due to their typical glass-forming behavior. Thermally cross-linked products based on the monomers exhibit good dielectric properties and low water uptake. Among these cross-linked monomers, the fluoro-containing resin displays better properties with a dielectric constant (Dk) of 2.74 and a dielectric loss (Df) of 1.89 × 10−3 at a frequency of 10 GHz, as well as exhibits a water uptake of 0.34 %. A control test indicates that the chemical structure of the bisphenol linker plays a crucial role for the formation of molecular glasses. When the linker is a rigid rod unit such as biphenyl group, the molecule does not exhibit molecular glass characteristics.

中文翻译：

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知道如何在高频下将分子玻璃制成低介电材料


已成功合成两种含有热交联可苯并环丁烯和烯丙基的功能单体以及一种作为接头的双酚单元。粉末 X 射线衍射表明单体保持完全无定形状态。DSC 迹线显示单体没有熔点，同时显示玻璃化转变。将单体在甲苯中的溶液浇注到玻璃板表面，形成光滑的薄膜。这些数据表明这些单体是分子玻璃，因为它们具有典型的玻璃形成行为。基于单体的热交联产品具有良好的介电性能和低吸水率。在这些交联单体中，含氟树脂表现出更好的性能，在 10 GHz 的频率下介电常数 （Dk） 为 2.74，介电损耗 （Df） 为 1.89 × 10−3，吸水率为 0.34 %。对照试验表明，双酚接头的化学结构对分子玻璃的形成起着至关重要的作用。当接头是刚性棒状单元（如联苯基团）时，分子不表现出分子玻璃特性。