Polymers containing alternating 1,4-bis(3-octyl-2,5-thienylene)phenylene and 2,5-pyridyl, 4,4’-biphenylene or phenylene repeating units Original Research Article

Two polymers based on polymer backbone modification, poly[1,4-bis(3-octyl-2,5-thienylene)phenylene-alt-2,5-pyridyl] (PBTYC8) and poly[1,4-bis(3-octyl-2,5-thienylene)phenylene-alt-4,4’-biphenylene] (PBTBBC8), were synthesized and characterized in comparison with other two polymers reported earlier: poly[3-octyl-2,5-thienylene-alt-1,4-phenylene] (PBTC8) and poly[1,4-bis(3-octyl-2-thienylene)phenylene] (PBTBC8). PBTBBC8 shows a lower conductivity in comparison with PBTC8 and PBTBC8. A trend in absorption peak wavelength (λmax) of solution samples and in emission peak wavelength (λem) of film samples is also noted for the polymers: PBTBBC8