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On the Impact of Siloxanated Side Chains on the Properties of Semiconducting Polymers
Benoit Heinrich,Thomas Heiser,Patrick Leveque,Nicolas Leclerc,Stephane Mery 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
For several years, semiconducting polymers substituted with siloxane side chains have shown remarkable charge transport properties, without being able to clearly identify its origin. To help clarify this matter, different series of π-conjugated polymers functionalized with either neat-alkylated or siloxane containing side-chains were synthesized and extensively characterized. While electronic molecular properties were little affected by the lateral chain change, the siloxane-functionalized polymers systematically showed enhanced charge carrier mobility values, suggesting the effect of a modified structure and/or morphology. Effectively, an extended X-ray scattering study of bulk materials and thin films evidenced an improved stacking of backbones enhancing the efficiency of conduction pathways. These results were explained in compliance with the intrinsic properties of siloxane. Molecular design rules were specified for the rational substitution of semiconducting polymer side chains.