Investigation of Polymer Aging Mechanisms Using Molecular Simulations: A Review
Abstract
:1. Introduction
2. The Commonly Used Molecular Simulation Methods
2.1. Traditional Molecular Dynamics (MD) Simulation
2.2. Quantum Mechanics (QM)
2.3. Reactive Molecular Dynamics (RMD) Simulation
3. Studies on Polymer Aging Mechanisms
3.1. Physical Aging and Aging under Mechanical Stress
3.2. Thermal Aging
3.3. Aging under the Influence of Moisture
3.4. Aging under the Influence of Oxygen
3.5. Aging under an Electric Field
3.6. Aging under High-Energy Particle Impact/Radiation Aging
4. Conclusions and Outlook on Future Work
4.1. Conclusions
- (1)
- Among the various research methods, the traditional MD simulation method based on classical force fields is mostly applied in the study of mechanical properties of materials, physical aging, diffusion behavior, and other physical processes; it also plays an important role in the construction of complex polymer and composite material model systems. The RMD method, which can study the dynamic processes of chemical reactions in large systems, has become the dominant approach to study the aging mechanism, especially when it involves chemical changes. The QM method is often used as an auxiliary method.
- (2)
- These simulation works have involved various influence factors: internal structure, mechanical stress, heat, oxygen, moisture, electric field, high-energy particle impacts, and radiation. These factors are sometimes studied together, such as moisture and heat, oxygen and heat, electric field and heat, etc. When a variety of factors act together on materials, they tend to affect each other and accelerate the aging process. The physical influences of these factors on material aging are mainly reflected in changing the morphology or movement state of polymer chains, and affecting the diffusion of small molecules or atoms; from the perspective of chemistry, the main effect is the breaking of chemical bonds (the breakage of chains, the removal of small groups or atoms). The starting time of the simulation research on the aging under different influence factors is different, and the depth and breadth of current research are also different. It is worth noting that the experimental research on photoaging started early and plays an important role, but the molecular simulation research on photoaging has been hardly involved so far, which may be due to the difficulty in representing light conditions in molecular simulations.
- (3)
- The research objects of these simulations are varied, and the research contents are relatively scattered. Most of the works are based on the actual storage or use conditions of the studied materials, attempting to explore the aging failure mechanism at the micro level. For each kind of studied material, its aging mechanisms under specific influencing factors has not been explored deeply enough. In addition, compared with pure polymer materials, there are relatively few works that focus on composite materials, and even less attention is paid to the aging characteristics at the interface region. Several studies noted the effects of aging promoters and inhibitors, or the incorporation of other materials into polymers to improve the anti-aging ability.
4.2. Outlook on Future Work
4.2.1. Multi-Scale Simulation
4.2.2. The Aging Database and Machine Learning
4.2.3. Explore the Aging Mechanism via Combining Theory and Data-Driven Methods
Author Contributions
Funding
Institutional Review Board Statement
Data Availability Statement
Conflicts of Interest
References
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Method | Scale | Characteristic | Application | Examples |
---|---|---|---|---|
QM | Electronic | High precision; computationally expensive for polymer systems | Calculate the bond energy | [31] |
Calculate the reaction activation energy | [28,32] | |||
RMD | Atomic | Unfixed bond connection; suitable for large polymer systems | Analyze the dynamic changes of species in the aging process | [33,34,35] |
Analyze the reaction path/mechanism | [33,34] | |||
Calculate the reaction rate | [36] | |||
MD | Molecular | Fixed bond connection; suitable for large polymer systems | Analyze the physical aging of glassy polymers | [37,38,39] |
Analyze changes in polymer properties | [37,40,41,42,43] | |||
Analyze the physical diffusion process in materials | [44,45,46] |
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Zhang, F.; Yang, R.; Lu, D. Investigation of Polymer Aging Mechanisms Using Molecular Simulations: A Review. Polymers 2023, 15, 1928. https://doi.org/10.3390/polym15081928
Zhang F, Yang R, Lu D. Investigation of Polymer Aging Mechanisms Using Molecular Simulations: A Review. Polymers. 2023; 15(8):1928. https://doi.org/10.3390/polym15081928
Chicago/Turabian StyleZhang, Fan, Rui Yang, and Diannan Lu. 2023. "Investigation of Polymer Aging Mechanisms Using Molecular Simulations: A Review" Polymers 15, no. 8: 1928. https://doi.org/10.3390/polym15081928