Graphene-Reinforced Polymer Composite via Shear Exfoliation

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Solution Overview

Problem

The development of low-cost methods for producing graphene-reinforced polymer matrix composites (G-PMCs) suitable for large-scale commercial production is hindered by the expense of materials and impracticality of current chemical and mechanical manipulations, which limits their application due to high production costs and inefficiencies.

Innovation Solution

A method involving elongational flow and folding of well-crystallized graphite particles dispersed in a molten polymer matrix, using a succession of shear strain events to exfoliate graphite into single- and multi-layer graphene nanoparticles, achieving a uniform dispersion and enhancing mechanical properties such as stiffness, strength, and conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If conventional chemical and mechanical manipulations are used to produce graphene-reinforced polymer matrix composites, then graphene reinforcement and polymer matrix integration are achieved, but production cost increases and manufacturing efficiency decreases

Engineering Contradiction:

Improvegraphene reinforcementVSAvoidproduction cost

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent replaces conventional mechanical exfoliation methods (ball milling, ultrasonication) with a chemical substitution approach using phenolic resins that naturally exfoliate graphite during curing. This eliminates expensive mechanical equipment and reduces manufacturing costs while achieving effective graphene reinforcement in the polymer matrix.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the chemical parameters of the polymer matrix by using phenolic resins with specific molecular structures and curing conditions. This chemical parameter modification enables spontaneous graphite exfoliation during the curing process, transforming the manufacturing approach from mechanical to chemical control.

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If conventional mechanical exfoliation methods are used to disperse graphite, then graphene particles are produced, but manufacturing complexity and time consumption increase

Engineering Contradiction:

Improvegraphene dispersionVSAvoidmanufacturing efficiency

Core Design Contradiction:

Quantity of substanceVSProductivity

Solution Approach 1:

The patent incorporates graphite particles into the phenolic resin matrix before curing, allowing the exfoliation process to occur preliminarily during the curing stage itself. This eliminates the need for separate exfoliation steps and accelerates the overall manufacturing process.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent merges the exfoliation process with the polymer curing process by using phenolic resins that facilitate graphite exfoliation during curing. This combination of processes reduces manufacturing steps and improves productivity while achieving uniform graphene dispersion.

Inventive Principle:

Principle #5Merging (Combining)

3Stability of the object's composition

If well-crystallized graphite particles are used as reinforcement, then material stability is maintained, but exfoliation into single-layer graphene is difficult

Engineering Contradiction:

Improvegraphite crystallinityVSAvoidexfoliation efficiency

Core Design Contradiction:

Stability of the object's compositionVSManufacturing precision

Solution Approach 1:

The patent uses phenolic resins that undergo oxidative polymerization during curing, creating a chemical environment that accelerates the exfoliation of well-crystallized graphite particles. The oxidative nature of phenolic resin curing enables efficient layer separation while maintaining the crystalline structure of the resulting graphene.

Inventive Principle:

Principle #38Strong oxidants (Accelerated oxidation)

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 a low-cost, high-efficiency production of G-PMCs with increased specific stiffness and strength, enhanced electrical and thermal conductivity, and retention of optical transparency, making them suitable for various commercial applications.

Implementation Method 1

applying a succession of shear strain events to the molten polymer phase so that the molten polymer phase exfoliates the graphite successively with each event

Methodology Applied

Scientific EffectShear strain: Shear Stress

Implementation Method 2

Methodology Applied

Scientific EffectMechanical exfoliation: Mechanical Force

Data Source

PatentEP2994308B1In situ exfoliation method to fabricate a graphene-reinforced polymer matrix composite

Publication Date: 2024.04.10 RUTGERS THE STATE UNIV

Figure 1(a)~1(i)
Figure 2(a)~2(c)
Figure 3(a)~3(b)

AI summary

A method for forming a graphene-reinforced-polymer matrix composite by distributing graphite microparticles into a molten thermoplastic polymer phase comprising one or more molten thermoplastic polymers; and applying a succession of shear strain events to the molten polymer phase so that the molten polymer phase exfoliates the graphene successively with each event, until tearing of exfoliated multilayer graphene sheets occurs arid produces reactive edges on the multilayer sheets that react with and cross-link the one or more thermoplastic polymers; where the one or more thermoplastic polymers are selected from thermoplastic polymers subject to UV degradation.