A series of modified poly(phenylene oxides) (PPOs) with low dielectric constant, high T_g and good dimensional stability were developed. These polymers were synthesized by treating brominated PPOs with a biobased anethole and polymerized at a high temperature in the presence of a peroxide. When the molar ratios of anethole in the PPO were 0.2, 0.35 and 0.5, respectively, the cross-linked PPOs displayed low dielectric constants of less than 2.74 and high T_g (more than 220 °C). In particular, the PPO with 0.5 molar ratio of anethole exhibited a coefficient of thermal expansion (CTE, 23.4 ppm/°C) that is comparable to copper foil (ca. 18 ppm/°C). This result indicated that the modified PPOs are suitable for the production of copper-cladded laminates in electronic industry. Moreover, compared to a commercial PPO having a T_g of 153 °C and CTE of 155.8 ppm/°C, the modified PPOs with anethole units possessed a higher thermostability. Considering that PPOs are widely used in the electronics industry, this contribution offers a new approach to prepare high-performance materials using a biobased feedstock.

中文翻译：

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生物基茴香脑功能化聚苯醚：具有高T _g和良好尺寸稳定性的新型低介电材料

开发了一系列介电常数低，T _g高，尺寸稳定性好的改性聚苯醚（PPOs）。这些聚合物是通过用生物基茴香脑处理溴化PPO合成的，并在过氧化物的存在下于高温下聚合。当PPO中茴香脑的摩尔比分别为0.2、0.35和0.5时，交联的PPO显示出低于2.74的低介电常数和高T _g（高于220°C）。特别是，茴香脑的摩尔比为0.5的PPO表现出的热膨胀系数（CTE，23.4 ppm /°C）与铜箔相当（约18 ppm /°C）。该结果表明，改性的PPO适用于电子工业中覆铜层压板的生产。此外，与具有153°C的T _g和155.8 ppm /°C的CTE的商用PPO相比，具有茴香脑单元的改性PPO具有更高的热稳定性。考虑到PPO在电子工业中得到了广泛的应用，这一贡献提供了一种使用生物基原料制备高性能材料的新方法。