Low dielectric constant polymers derived from bio-based anethole and isoeugenol

Starting from the natural products anethole and isoeugenol, two functional monomers with thermocrosslinkable benzocyclobutene units have been synthesized and converted into the cross-linked resins. Both of the two resins exhibit good thermostability with Tg of more than 380 degrees C and T5d of exceeded 440 degrees C and storage modulus of higher 1 GPa, as well as good dielectric constants of lower than 2.68 and dielectric loss of less than 2.1 x 10-3. Moreover, the resins also exhibit good hydrophobicity. These data indicate that the two bio-based monomers are suitable as the precursors for the application in the microelectronic industry.