Synthesis and Properties of Donor-acceptor-type Polymers Comprising Alkoxy-substituted Bithiophene Units

Abstract

Two donor-acceptor-type conjugated polymers comprising alkoxy-substituted bithiophenes were synthesized by both direct C-H arylation polymerization and Stille-type polycondensation. Although these polymers contain the same components, i.e. two alkoxythiophene moieties and one benzothiadiazole moiety in a repeating unit, their optical and electrochemical properties were clearly different owing to their different regioregularities.

Enhancement of thermoelectric properties of D‐A conjugated polymer through constructing random copolymers with more electronic donors

“…47 I. Imae et al reported that introduction of alkoxy groups could enhance the electron-donating nature of D-A polymers and reduce their oxidation potentials. [48][49][50][51] Here, in our work, with incorporating more electron rich 3,4-EDOT units, the onset oxidation potentials of the random copolymers reduced and the corresponding HOMO level of the random copolymers rised from À5.20, À5.07 to À4.95 eV for PDPP-EDOT-20, PDPP-EDOT-40 and PDPP-EDOT-50, respectively. The reduction peak for these polymers were decreased to lower potential as the content of EDOT units increased in the polymers.…”