Graphenic Carbon Dispersions With Polymeric Resins for Stable High Loading
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Solution Overview
Problem
Graphene nanoparticles are difficult to disperse effectively in other materials, leading to instability and aggregation, which limits their applications in conductive inks, battery coatings, and other uses.
Innovation Solution
A dispersion comprising graphenic carbon nanoparticles with an average aspect ratio greater than 3:1 and a Raman 2D:G peak ratio of at least 1:1, mixed with a polymeric dispersant resin comprising an addition polymer, such as vinyl heterocyclic amides, to enhance stability and uniform distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If graphenic carbon nanoparticles are used in dispersions, then conductivity and performance are improved, but dispersion stability deteriorates due to aggregation
Solution Approach 1:
A dispersant resin comprising an addition polymer containing vinyl heterocyclic amide units is introduced as an intermediary substance between graphenic carbon nanoparticles and the dispersion medium. The dispersant resin adsorbs onto the nanoparticle surfaces through π-π stacking interactions and steric stabilization, preventing aggregation while maintaining dispersion stability throughout storage and application.
Solution Approach 2:
The invention creates a composite dispersion system combining graphenic carbon nanoparticles with a specifically designed polymeric dispersant resin. This composite approach leverages the synergistic interaction between the nanoparticle conductive properties and the dispersant's stabilizing functionality, achieving both high performance and long-term stability.
2Quantity of substance
If high loadings of graphenic carbon nanoparticles are achieved, then conductivity and performance are improved, but uniform distribution becomes difficult
Solution Approach 1:
The dispersant resin acts as a mediator that enables high nanoparticle loadings by providing steric barriers between particles. The polymer chains extend into the dispersion medium, creating physical separation that prevents aggregation even at high concentrations, thereby maintaining uniform distribution throughout the formulation.
Solution Approach 2:
The invention changes the chemical and physical parameters of the dispersion system by introducing a dispersant with specific molecular characteristics (vinyl heterocyclic amide units, particular molecular weight range). This parameter change fundamentally alters the interaction dynamics between nanoparticles, enabling high loadings with maintained uniformity.
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
The solution results in stable dispersions with improved uniformity and high loadings of graphenic carbon nanoparticles, maintaining stability at room and elevated temperatures, and enabling their effective use in various applications like conductive inks and battery coatings.
Implementation Method 1
a polymeric dispersant resin comprising an addition polymer comprising the residue of a vinyl heterocyclic amide
Implementation Method 2
a polymeric dispersant resin comprising an addition polymer comprising a homopolymer, a block (co)polymer, a random (co)polymer, an alternating (co)polymer, a graft (co)polymer, a brush (co)polymer, a star (co)polymer, a telechelic (co)polymer
Data Source
AI summary
Graphenic carbon nanoparticles that are dispersed in solvents through the use of dispersant resins are disclosed. The graphenic carbon nanoparticles may be milled prior to dispersion. The dispersant resins may comprise a polymeric dispersant resin comprising an addition polymer comprising the residue of a vinyl heterocyclic amide, an addition polymer comprising a homopolymer, a block (co)polymer, a random (co)polymer, an alternating (co)polymer, a graft (co)polymer, a brush (co)polymer, a star (co)polymer, a telechelic (co)polymer, or a combination thereof. The solvents may be aqueous, non-aqueous, inorganic and/or organic solvents. The dispersions are highly stable and may contain relatively high loadings of the graphenic carbon nanoparticles.