Impact of the Catalytic System on the Formation of Structural Defects for the Synthesis of Well‐Defined Donor–Acceptor Semiconducting Polymers. Issue 23 (12th October 2017)

• Record Type: Journal Article
• Authors: Spanos, Michael; Gregoriou, Vasilis G.; Avgeropoulos, Apostolos; Chochos, Christos L.
• Is Part Of: Macromolecular chemistry and physics. Volume 218:Issue 23(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-10-12
• Subjects: conjugated polymers -- donor–acceptor -- organic photovoltaics -- palladium catalysts -- structural defects; Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201700283
• Languages: English
• ISSNs: 1022-1352

Abstract

Abstract: This study the impact of different catalytic systems on the formation of structural defects among the macromolecular chain, in the molecular characteristics (average molecular weights per number ( M ¯ n ), per weight ( M ¯ w ), and polydispersity index ( Đ )), along with the composition ratio of the two monomeric units within the main chain for a specific class of conjugated polymers through the utilization of size exclusion chromatography and proton nuclear magnetic resonance ( 1 H‐NMR) spectroscopy, respectively is examined. From the obtained results, the formation of the structural defects in the studied "donor–acceptor" polymers is visualized and quantified by 1 H‐NMR. The alternating polymers containing the lower percentage of chemical defects demonstrate increased M ¯ n and M ¯ w values and increased absorption co‐efficiency as recorded by UV–vis absorption spectroscopy. Therefore, it is evident that this work highlights optimum Stille cross‐coupling polymerization conditions, which can be a guide rule for the synthesis of defect‐free conjugated polymers. Abstract : The influence of the catalytic system in the formation of structural defects within the donor–acceptor macromolecular chain, in the molecular characteristics and in the ratio of the two monomers, is achieved through the utilization of size exclusion chromatography and proton nuclear magnetic resonance ( 1 H‐NMR), respectively, by studying a series of alternating polymers consisting of indacenodithiophene and quinoxaline moieties.