Scheme 1.

Copolymer synthesis, (i) N, N-dimethylaminopyridine, p-toluene sulfonic acid monohydrate, N, N-diisopropylcarbodiimide/dichloromethane, RT, 24 h; (ii) trifluoroacetic acid, triisopropyl silane/water, RT, 5 h.

Copolymer synthesis, (i) N, N-dimethylaminopyridine, p-toluene sulfonic acid monohydrate, N, N-diisopropylcarbodiimide/dichloromethane, RT, 24 h; (ii) trifluoroacetic acid, triisopropyl silane/water, RT, 5 h.