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Controlling Solution-State Aggregation and Solid-State Microstructures of Conjugated Polymers by Tuning Backbone

Hao-Tian Wu1, Ze-Fan Yao1, Zhe Xu1

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Highly twisted polymer backbones prevent ordered assembly, impacting charge transport in optoelectronic devices. This study explores how backbone conformation influences polymer aggregation and solid-state structures.

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chain conformationconjugated polymersmolecular orderingpolymer transistorssolution aggregates

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Organic Electronics

Background:

  • Molecular ordering in conjugated polymers is crucial for charge transport in optoelectronic devices.
  • The influence of polymer backbone conformation on assembly structures remains poorly understood.

Purpose of the Study:

  • To investigate the effect of backbone conformation on the assembly structures of conjugated polymers.
  • To understand the relationship between polymer backbone conformation and charge transport properties.

Main Methods:

  • Systematic development of three novel chlorinated benzodifurandione-based oligo(p-phenylene vinylene) (BDOPV) polymers.
  • Analysis of backbone conformation, specifically interunit torsion angles.
  • Investigation of solution-state aggregation and solid-state packing structures.

Main Results:

  • BDOPV polymers exhibit significantly twisted backbone conformations with near 90° interunit torsion angles.
  • Twisted backbones increase conformational energy penalty, preventing ordered assembly.
  • Nonaggregated chains in solution and disordered solid-state packing were observed.

Conclusions:

  • Polymer backbone conformation directly influences molecular ordering and assembly structures.
  • Highly twisted conformations hinder ordered assembly, leading to disordered solid-state packing.
  • This research deepens the understanding of structure-property relationships in conjugated polymers for optoelectronics.