Polymer Chain Breakage Simulation With Local Quantum Mechanics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing computer simulation methods for polymer materials do not effectively and stably compute the breakage of molecular chains, particularly under large forces.
Innovation Solution
A computer simulation method that calculates physical quantities using molecular mechanics and quantum mechanics to determine the breakage of molecular chains in polymer materials, involving energy and force calculations, and updates particle model coordinates to simulate bond dissociation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If molecular mechanics calculation is used for the entire polymeric material model, then computation time is reduced, but calculation accuracy for bond breakage is insufficient
Solution Approach 1:
The polymeric material model is divided into two regions: a first region (entire model) calculated using molecular mechanics for efficient computation of overall deformation, and a second region (subset model containing bonds likely to break) calculated using quantum mechanics for accurate bond breakage prediction. This segmentation allows each method to be applied where it is most effective.
Solution Approach 2:
Different calculation methods are applied to different regions of the model: molecular mechanics is used for regions where high-speed computation is sufficient, while quantum mechanics is specifically applied to local regions where bond breakage is anticipated, providing locally optimized accuracy without sacrificing overall computational efficiency.
2Measurement precision
If quantum mechanics calculation is performed on the entire polymeric material model, then calculation accuracy for bond breakage is improved, but computation time increases significantly
Solution Approach 1:
The computationally intensive quantum mechanics calculation is extracted from the entire model and applied only to a subset model containing specifically the bonds likely to break. This extraction eliminates unnecessary quantum calculations on bonds that will not break, dramatically reducing computation time while maintaining accuracy where it matters.
Solution Approach 2:
Instead of performing quantum mechanics calculation on all bonds (excessive action), the method performs quantum mechanics calculation only on a selected subset of bonds that are most likely to break (partial action), providing sufficient accuracy for the critical regions without the computational burden of universal application.
3Speed
If molecular mechanics is used for the whole model, then computation speed is maintained, but the method of breaking molecular chain model is not well established
Solution Approach 1:
The method performs preliminary deformation calculation using molecular mechanics to identify which bonds are likely to break before performing quantum mechanics calculations. This preliminary action prepares the system by identifying critical regions in advance, ensuring that subsequent quantum mechanics calculations are focused on the right bonds for reliable breakage prediction.
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
Stably computes the breakage of molecular chains in polymer materials, reducing computation time and enhancing accuracy by targeting specific regions for quantum mechanics calculations.
Implementation Method 1
a breaking calculation step S4 of performing a quantum mechanics calculation on the subset model
Implementation Method 2
performing a molecular mechanics calculation on the polymeric material model; performing a molecular mechanics calculation on the subset model
Implementation Method 3
a relaxation calculation of the polymeric material model is performed based on molecular dynamics within the virtual space
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A simulation method for analyzing a breakage of a molecular chain of a polymer material using a computer comprises: defining a polymeric material model by setting a molecular chain model in a virtual space corresponding to a portion of the polymeric material; and calculating a breaking of the molecular chain model. The calculating of the breaking comprises: a step S46 of performing a molecular mechanics calculation using the polymeric material model; a step S48 of performing a quantum mechanics calculation targeting on only a subset model including a particle model couple whose distance is greater than a predetermined first distance; and a step S54 of dissociating the bond between the particle models in the molecular chain model which particle models correspond to the particle model couple, if the distance between the particle models is larger than a second distance, wherein the second distance is larger than the first distance and equal to a distance between the particle models at an inflection point of a bond-dissociation potential plus a value of from 1.0 to 2.5 angstrom.