Study on the Mechanical Behavior and Molecular Dynamics of Functional Polymer Structures

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: closed (10 December 2021) | Viewed by 4198

Special Issue Editor


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Guest Editor
Department of Mechanical Engineering, Hanyang University, Ansan, Korea
Interests: polymer nanocomposites; smart polymers; computational mechanics; interface characterization; molecular dynamics simulation; multiscale modeling

Special Issue Information

Dear Colleagues,

Thanks to the rapid development and expansion of computational resources in the past 20 years, we have been able to extend the depth of our gaze on nature and engineering to the microscopic world at the atomic level through computer simulation. In particular, research exploring the macromolecular properties of materials as well as the molecular mechanics of intrinsic microstructures has been spotlighted for polymer nanocomposites in which functional polymers and/or nanoparticles are inserted. Through modeling and analysis based on continuum mechanics, molecular dynamics, and quantum mechanics, we can deeply grasp the characteristics of the microstructures that make up polymer materials and their physical properties.

The main goal of this Special Issue is to collect the latest contributions to research topics on functional polymers and polymer-based nanostructures. We welcome all kinds of computational/theoretical approaches, such as continuum mechanics of composites, all-atom molecular dynamics, density functional theory, Monte-Carlo method and coarse-grained modeling. Furthermore, multi-scale modeling that combines two or more simulation methodologies, coupling computer simulation with experiments and new polymer material design studies through machine learning algorithms are also highly recommended.

Prof. Dr. Joonmyung Choi
Guest Editor

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Keywords

  • smart functional polymers
  • polymer nanocomposites
  • interfaces and interphases
  • molecular dynamics simulation
  • multiscale modeling
  • composite mechanics

Published Papers (2 papers)

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Research

9 pages, 3512 KiB  
Article
Acoustic Emission Testing and Ib-Value Analysis of Ultraviolet Light-Irradiated Fiber Composites
by Doyun Jung and Wonjin Na
Appl. Sci. 2021, 11(14), 6550; https://0-doi-org.brum.beds.ac.uk/10.3390/app11146550 - 16 Jul 2021
Cited by 1 | Viewed by 1691
Abstract
The failure behavior of composites under ultraviolet (UV) irradiation was investigated by acoustic emission (AE) testing and Ib-value analysis. AE signals were acquired from woven glass fiber/epoxy specimens tested under tensile load. Cracks initiated earlier in UV-irradiated specimens, with a higher [...] Read more.
The failure behavior of composites under ultraviolet (UV) irradiation was investigated by acoustic emission (AE) testing and Ib-value analysis. AE signals were acquired from woven glass fiber/epoxy specimens tested under tensile load. Cracks initiated earlier in UV-irradiated specimens, with a higher crack growth rate in comparison to the pristine specimen. In the UV-degraded specimen, a serrated fracture surface appeared due to surface hardening and damaged interfaces. All specimens displayed a linearly decreasing trend in Ib-values with an increasing irradiation time, reaching the same value at final failure even when the starting values were different. Full article
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13 pages, 4438 KiB  
Article
Computational Study on Interfacial Interactions between Polymethyl Methacrylate-Based Bone Cement and Hydroxyapatite in Nanoscale
by Hongdeok Kim, Byeonghwa Goh, Sol Lee, Kyujo Lee and Joonmyung Choi
Appl. Sci. 2021, 11(7), 2937; https://0-doi-org.brum.beds.ac.uk/10.3390/app11072937 - 25 Mar 2021
Cited by 3 | Viewed by 1989
Abstract
Polymethyl methacrylate (PMMA)-based bone cement (BC) is a key material in joint replacement surgery that transfers external forces from the implant to the bone while allowing their robust binding. To quantitatively evaluate the effect of polymerization on the thermomechanical properties of the BC [...] Read more.
Polymethyl methacrylate (PMMA)-based bone cement (BC) is a key material in joint replacement surgery that transfers external forces from the implant to the bone while allowing their robust binding. To quantitatively evaluate the effect of polymerization on the thermomechanical properties of the BC and on the interaction characteristics with the bone ceramic hydroxyapatite (HAp), molecular dynamics simulations were performed. The mechanical stiffness of the BC material under external loading increased gradually with the crosslinking reaction occurrence, indicating increasing load transfer between the constituent molecules. In addition, as the individual Methyl Methacrylate (MMA) segments were interconnected in the system, the freedom of the molecular network was largely suppressed, resulting in more thermally stable structures. Furthermore, the pull-out tests using HAp/BC bilayer models under different constraints (BC at 40% and 85%) revealed the cohesive characteristics of the BC with the bone scaffold in molecular detail. The stiffness and the fracture energy increased by 32% and 98%, respectively, with the crosslink density increasing. Full article
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