Polyphenylene Based Branched Polymers: Synthesis, Characterization and Properties Investigation

摘要

Polyphenylene based conjugated polymers have emerged as promising materials for chemical and biosensors, electronic and photonic devices. The studies of the structural and functional variations of pendant side chains of polyphenylene, pioneered by Rehan, Schluter, and Wegner are fascinating. However, no significant amount of work has been done on 2-dimensional (2D) polyphenylenes. In order to explore the structure-property relationship of 2D-backbone, A2, B2 type monomers were used to form 1- dimensional (1D) backbone and a small amount of planar C3 type monomer to connect (or cross-link) the 1D backbone to form 2D- structure. The C3-type monomer also helps to improve the molecular weight. Both 1,2,4-tribromobenzene and 1,3,5-tribromobenzene were used as C3 type cross links to form conjugated 2D-polymers. By using small amounts of cross-links, it is expected that the length of the 1D- backbone should be long enough to maintain its properties. By using the optimum reaction conditions, high molecular weight polymers (Scheme 1 and Scheme 2) were obtained.