Synthesis and electrochromic properties of methacrylate copolymers containing pendant terthiophene and oligo(ethyleneoxide) moieties

Novel methacrylate copolymers containing pendant terthiophene and oligo(eth yleneoxide) moieties, poly(2,2':5',2"-terthiophen-5-yl)methyl methacrylate- co-alpha-ethoxy-omega-methacryloyl-(poly (MA3T-co-MAEO)), were prepared by radical copolymerization of the corresponding monomers in varying mole rati os and their application as electrochromic materials examined The copolymer s were found to undergo reversible, clear color change from yellowish orang e to purple and vice versa on electrochemical doping and dedoping. The resp onse time for color change on electrochemical doping and dedoping was found to decrease for the copolymers than for the corresponding methacrylate hom opolymer containing pendant terthiophene.