Polymer Membrane Gas Permeability Simulation

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Solution Overview

Problem

Current methods for evaluating gas permeability of polymer membranes are time-consuming and costly, and struggle to isolate the influence of molecular structure on gas permeability due to complex polymer chain interactions and infinite influential factors.

Innovation Solution

A method involving a polymer unit cell with a single polymer chain, where the volume is adjusted and gas permeability is measured by stacking unit cells in a specific direction to minimize extraneous factors, allowing for precise evaluation of the polymer chain's impact on gas permeability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If experimental methods are used to measure gas permeability, then measurement accuracy is achieved, but time consumption and cost increase significantly

Engineering Contradiction:

Improvegas permeability measurement accuracyVSAvoidevaluation time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent creates a virtual copy of the polymer membrane through molecular dynamics simulation, replacing physical experimental measurements with computational modeling. This allows gas permeability to be evaluated through simulated molecular interactions, achieving measurement objectives without time-consuming physical experiments while maintaining scientific rigor through validated simulation methodologies

Inventive Principle:

Principle #26Copying

2Loss of time

If molecular dynamics simulation is used to evaluate gas permeability, then time and cost are reduced, but ability to isolate molecular structure influence is compromised due to complex polymer chain interactions

Engineering Contradiction:

Improveevaluation timeVSAvoidmolecular structure influence evaluation accuracy

Core Design Contradiction:

Loss of timeVSMeasurement precision

Solution Approach 1:

The patent segments the complex polymer membrane system into individual polymer chains, evaluating each chain's contribution to gas permeability separately. By isolating single polymer chains in the simulation and measuring their individual gas permeability characteristics, the method can attribute permeability changes to specific molecular structural features without the confounding effects of inter-chain interactions present in bulk membranes

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent extracts the essential functional element (single polymer chain) from the complex polymer membrane system to study its intrinsic gas permeability properties. By removing adjacent chains and their interactions, the simulation focuses solely on the relationship between a specific polymer chain's molecular structure and its gas permeability, enabling precise structure-property relationship analysis

Inventive Principle:

Principle #2Taking out (Extraction)

3Loss of information

If conventional molecular dynamics simulation measures permeability through mean square displacement, then particle behavior is captured, but influence of single polymer chain structure cannot be isolated due to infinite influential factors

Engineering Contradiction:

Improveparticle behavior informationVSAvoidsingle polymer chain structure influence

Core Design Contradiction:

Loss of informationVSMeasurement precision

Solution Approach 1:

The patent divides the simulation system into isolated single polymer chain units, eliminating the infinite influential factors from adjacent chains. By measuring gas permeability through each segmented unit independently rather than through bulk membrane MSD analysis, the method can directly correlate structural parameters of individual chains with their permeability performance

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of measuring permeability indirectly through mean square displacement of particles in a bulk membrane (which captures collective behavior), the patent inverts the approach by directly simulating gas permeation events through individual polymer chains. This inversion allows direct observation of gas molecules passing through specific chain structures, enabling precise structure-permeability relationship determination

Inventive Principle:

Principle #13The other way round (Inversion)

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 enables efficient and cost-effective quantification of gas permeability, isolating the effect of a single polymer chain's structure and reducing the influence of complex interactions, thereby improving the understanding of gas permeability mechanisms.

Implementation Method 1

providing or adding or permeating a permeating gas that permeates through the polymer unit cell; and allowing or supplying the permeating gas to permeate through the polymer unit cell

Methodology Applied

Scientific EffectDiffusion: Diffusion

Data Source

PatentUS11215547B2Method of evaluating gas permeability of polymer membrane based on molecular dynamics simulation

Publication Date: 2022.01.04 HYUNDAI MOTOR CO LTD

AI summary

The present invention provides a method for measuring gas permeability of a polymer membrane, for example, by evaluating polymer-structure influence on gas permeability in of a polymer membrane.