Synthesis of imide random copolymers containing π-rich and π-poor aromatic rings. i) Dichloro-di(3-bromopyridino)-N,N′-Dimesitylenoimidazolino- Ru=CHPh (G3) catalyst, CH2Cl2, RT, 45 min; ii) Ethyl vinyl ether, RT, overnight; iii) TFA/CH2Cl2 (1:1), RT, overnight. All polymers were synthesized with n=20 and m=20. R1 was defined in Scheme 2.