Conductive Paper Composite via In-Situ Polymerization
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Solution Overview
Problem
Existing electrically conductive composite materials face challenges in environmental sustainability and processing difficulties due to the use of non-renewable and infusible conducting polymers, limiting their widespread application in materials like electrostatic dissipation and electromagnetic shielding.
Innovation Solution
The development of electrically conductive paper composites by modifying cellulose fibers with a conductive polymer, such as polypyrrole, using an in-situ chemical polymerization method, which incorporates a dopant like anthraquinone-2-sulfonic acid, and blending these modified fibers with unmodified cellulose fibers to achieve enhanced tensile strength and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conducting polymers are used to create electrically conductive composite materials, then electrical conductivity is improved, but environmental sustainability deteriorates due to non-renewable resources and processing difficulties
Solution Approach 1:
The patent uses cellulose fiber as an intermediary carrier substrate to support the conducting polymer. The cellulose fiber provides a renewable, processable framework that enables the conducting polymer to be manufactured into practical articles while maintaining electrical conductivity. This resolves the contradiction by mediating between the functional requirements of the conducting polymer and the manufacturing advantages of cellulose.
Solution Approach 2:
The patent creates a hybrid composite material combining cellulose fiber and conducting polymer through in-situ synthesis. This composite inherits the mechanical properties and processability of cellulose while maintaining the electrical conductivity of the conducting polymer, thus resolving the contradiction between conductivity and ease of manufacture.
2Reliability
If conducting polymers are used to create electrically conductive composite materials, then electrical conductivity is improved, but environmental sustainability deteriorates
Solution Approach 1:
The patent changes the fundamental parameter of material origin from non-renewable petroleum-based conducting polymers to renewable cellulose-based hybrid materials. This parameter change maintains the electrical conductivity function while dramatically improving environmental sustainability by using biodegradable cellulose as the primary structural component.
Solution Approach 2:
Cellulose fiber acts as an environmentally benign intermediary that replaces harmful non-renewable materials. The cellulose provides the structural framework while the conducting polymer provides the electrical function, creating a hybrid that is both conductive and environmentally sustainable.
3Reliability
If in-situ chemical polymerization is used to create conductive polymers on fiber substrates, then electrical conductivity is improved, but monomer usage efficiency deteriorates
Solution Approach 1:
The patent applies local quality by concentrating the conducting polymer synthesis specifically on the fiber surface through in-situ polymerization. This localized approach ensures that monomer is converted to polymer precisely where needed (on the fiber surface) rather than being wasted in bulk solution, improving monomer usage efficiency while maintaining electrical conductivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in conductive paper composites with improved tensile strength and electrical conductivity, allowing for the production of eco-friendly, disposable, or recyclable products with reduced monomer usage, suitable for applications like electrostatic dissipation packaging, while maintaining the unique properties of conducting polymers.
Implementation Method 1
modifying cellulose fibers to bind an electrically conductive polymer to a surface thereof by simultaneously adding monomers, an oxidant, and a dopant to untreated cellulose fibers, and initiating polymerization of said monomer in the presence of the dopant to form the electrically conducting polymer on the surface of the cellulose fibers
Implementation Method 2
treating the porous substance with liquid pyrrole, and then using a strong oxidant in the presence of a non-nucleophilic anion so that the pyrrole monomer is oxidized to a pyrrole polymer
Data Source
AI summary
The present invention provides electrically conductive paper composites prepared from cellulose fibers modified to bind a conducting polymer to a surface of the cellulose fibers and mixing these with unmodified cellulose fibers and forming paper products from the composite. Conducting paper composites so formed were investigated for their conductivity and strength properties as a function of monomer dosage or percentage of modified fibers in the mixture and for the composites it was found that less monomer (i.e. conductive polymer) was needed to achieve the same conductivity obtained from conducting paper made from only the modified cellulose. A higher tensile strength was obtained with the composite conducting paper than was attained with conducting paper made from only the modified cellulose. The electrically conductive paper composites may also be prepared from cellulose fibers mixed with particulate fillers modified to bind a conducting polymer to a surface of the particulate fillers.