A low dielectric polymer with high thermostability derived from bio-based isoeugenol

A fluorine-containing monomer derived from bio-based isoeugenol has been successfully synthesized. This monomer was thermally cross-linked to form a polymer, displaying good dielectric properties with a dielectric constant (Dk) of 2.60 and a dissipation factor (Df) of 1.40 × 10−3 at a high frequency of 10 GHz. The polymer also exhibited high thermostability with a weight loss temperature (T5d) of 483 °C, a char yield of 64 % at 1000 °C in N2, a glass transition temperature (Tg) of 334 °C and a coefficient of thermal expansion (CTE) of 53 ppm/°C at the range of temperatures from 35 to 300 °C. These good comprehensive properties imply that the isoeugenol-based monomer is an ideal precursor for the fabrication of the dielectric materials used in the field of high-frequency communication.