Open-Shell Polymer Conductors for Stable SWCNT Composites
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Solution Overview
Problem
Conductive polymer composites face limitations in achieving high conductivity without harsh dopants, stable SWCNT dispersion, and scalable production due to issues like high cost, poor dispersity, and structural defects, which hinder their integration in emerging technologies.
Innovation Solution
Development of intrinsically conductive open-shell donor-acceptor polymers with modular synthetic approaches that enable high intrinsic conductivity and tunability, avoiding the need for harsh dopants and SWCNT sorting, and using these polymers as non-covalent dispersants for SWCNTs to form stable composites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If harsh dopants are used to achieve high conductivity in conventional conductive polymers, then electrical conductivity is improved, but environmental stability and thermodynamic stability deteriorate
Solution Approach 1:
The invention extracts and eliminates the need for harsh dopants from the conductive polymer system. By designing polymers with intrinsic open-shell character through alternating electron-deficient and electron-rich moieties, the material achieves high conductivity without requiring external dopants, thereby resolving the contradiction between conductivity and stability
Solution Approach 2:
The invention changes the fundamental electronic parameter of the polymer from closed-shell to open-shell character. This parameter change enables the polymer to possess unpaired electrons that provide intrinsic conductivity while maintaining environmental stability, as the conductivity arises from the polymer's electronic structure rather than from dopant-induced charge carriers
2Reliability
If SWCNTs are used to enhance conductivity in polymer composites, then electrical conductivity is improved, but cost and dispersity deteriorate
Solution Approach 1:
The invention uses the open-shell polymer as an intermediary dispersant for SWCNTs. The polymer's unique electronic structure enables it to effectively disperse SWCNTs without requiring additional surfactants or complex processing, improving both dispersity and cost-effectiveness while maintaining the conductivity benefits of SWCNT composites
Solution Approach 2:
The invention creates a composite system where the open-shell polymer matrix and SWCNTs work synergistically. The polymer provides intrinsic conductivity and acts as a dispersant, while SWCNTs provide additional conductive pathways, achieving high conductivity with improved dispersity and reduced cost compared to conventional SWCNT composites
3Ease of manufacture
If conventional closed-shell polymers are used as conductive materials, then processability is maintained, but intrinsic conductivity and tunability deteriorate
Solution Approach 1:
The invention changes the electronic parameter from closed-shell to open-shell character while maintaining the polymer's solution processability. The open-shell polymers can be processed from solution like conventional polymers but exhibit superior intrinsic conductivity and broader tunability through modification of the electron-deficient and electron-rich moieties
Solution Approach 2:
The open-shell polymer serves multiple functions simultaneously: it provides the polymer matrix structure for processability, acts as an intrinsic conductive material, serves as a dispersant for SWCNTs, and offers tunability through chemical modification. This multi-functionality resolves the contradiction between ease of manufacture and intrinsic conductivity
Data Source
AI summary
The invention provides for polymer structures and their preparation and resulting novel functionalities including open-shell character and high intrinsic conductivity with wide-range tenability. Electrical conductivity can be further modulated by introducing or blending with materials, fillers, dopants, and/or additives. The materials or resultant composites of the invention can be processed by various techniques into different forms to realize multiple applications.