Carbazolevinylene and phenylenevinylene polymers by ring-opening metathesis polymerization and their characterization, nanoaggregates and optical and electrochemical properties

Homopolymers and random and block copolymers containing carbazolevinylenes and phenylenevinylenes were synthesized by ring-opening metathesis polymerization of the ring-strained monomers such as carbazolephanedienes and cyclophanedienes in the presence of the third generation Grubbs' initiator. The different molar ratios of the individual blocks were prepared by simply altering the monomer to initiator ratio. The poly-dispersity index of the block copolymers was relatively low and was in a range of 1.25-1.35. The absorption band of the copolymers with three different ratios of the individual block mainly exhibited a combination of the absorption band of the two individual homopolymers. The energy transfer of the block polymers from carbazolevinylenes to phenylenevinylenes is more effective in solid state than in solution. The emission color of the block copolymer solution can be changed from blue to yellow depending on the volume ratio of the mixture of THE and methanol. The carbazolevinylene and phenylenevinylene block polymers with a molar ratio of 40:51 exhibited unique network-like aggregates containing several spherical nanoparticles with the average diameter of 38 nm.