Biobased Low-k Polymers at High Frequency Derived from Isoeugenol AITranslate

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DOI：https://doi.org/10.1021/acsapm.2c01051

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Two biobased functional monomers (M1 and M2) derived from isoeugenol have been successfully prepared through the Ullmann–Ma and the Piers–Rubinsztajn reactions in an overall yield of more than 81%. These two monomers have also been converted into the cross-linked polymers by a thermo-curing reaction. The obtained polymers display good thermostability, hydrophobicity, and low-dielectric performance. Among them, cured M1 exhibits a higher glass transition temperature (Tg) of 384 °C and a lower coefficient of thermal expansion (CTE) of 53 ppm/°C in a range of the temperatures from 25 to 350 °C, while cured M2 displays good dielectric properties with a dielectric constant (Dk) of 2.53 and a dielectric loss (Df) of 1.21 × 10–3 at a frequency of 5 GHz. Such good dielectric properties for cured M2 remain stable even keeping it in boiling water for 96 h. The thermo-curing reaction of the mixture of two monomers in a molar ratio of 1:1 was also investigated and the results indicated that the formed polymer (cured B1) had good comprehensive performances with a Tg of 265 °C, CTE of 67 ppm/°C, Dk of 2.62, and Df of 1.96 × 10–3. Such data are superior to those of many commercial dielectric materials, suggesting that the two biobased monomers are suitable as the precursors of dielectric materials for the application in high-frequency communication.