Low reflective index, highly transparent, and ultra-low dielectric constant materials prepared via effective copolymerization of 4-methyl-1-pentene and a Si-containing α,ω-diolefin

A series of ultra-low dielectric constant materials containing C–Si-cyclic units were prepared. The new copolymers showed stable and ultra-low dielectric constants below 2.0, tunable glass transition temperature and mechanical performance.