SYNTHESIS AND ELECTRICAL-PROPERTIES OF POLY(2-BROMO-5-METHOXY-1,4-PHENYLENEVINYLENE) AND COPOLYMERS

Poly(2-bromo-5-methoxy-1,4-phenylenevinylene) (PBrMPV) and a series of PPV copolymers containing 2-bromo-5-methoxy-1,4-phenylenevinylene (BrMPV) units were prepared via the water-soluble precursor method. They were obtained in film form and were readily doped with 12. Doping of undrawn and drawn films of PBrMPV homopolymer with I2 vapor led to conductivities of 10(-5)-10(-3)S cm-1. Conductivities of 12-doped copolymer films ranged from 10(-3) to 10(-1) S cm-1, depending on composition. Films of undrawn copolymers showed a very insensitive composition dependence of electrical conductivity ranging from 1.5 X 10(-3) to 8.2 X 10(-3) S cm-1. The copolymer containing a very low level (approximately 1 mol %) of BrMPV unit revealed the highest conductivity among the copolymer compositions. The UV-vis spectral characteristics of the copolymers were slightly different from those of the PPV homopolymer, and lambda(max) values were red-shifted to about 435-440 nm, depending on composition.