New Triazine-Based Polymers with Low Dielectric Constants and High Thermostability Derived from Biorenewable Anethole and Thermocrosslinkable Benzocyclobutene

Abstract

A series of new triazine-based polymers derived from biorenewable anethole and thermocrosslinkable benzocyclobutene were developed. These polymers were formed via a thermoinduced Diels–Alder cycloaddition reaction between anethole and benzocyclobutene, and they displayed good thermostability (5% weight loss) up to 425 °C, glass transition temperatures (Tgs) of up to 290 °C, and coefficients of thermal expansion (CTEs) of less than 63 ppm/°C between 30 and 300 °C. These polymers also exhibited low dielectric constants of less than 2.85 for frequencies ranging from 0.1 to 30.0 MHz. The polymers with fluoro groups show the better dielectric properties with an average dielectric constant (Dk) of less than 2.76 and an average dissipation factor (Df) of about 0.0025. When the fluoropolymers were kept in water at room temperature for 5 days, Dk was maintained below 2.90. When a biorenewable anethole was introduced to the benzocyclobutene-based polymers, the properties of the polymers were enhanced. These new polymers are suitable as high-performance resins in the microelectronic industry.