Mechanical and Structural Properties of Polymer Materials

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Physics and Theory".

Deadline for manuscript submissions: 15 February 2025 | Viewed by 1843

Special Issue Editors


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Guest Editor
Luxembourg Institute of Science and Technology (LIST), Materials Research and Technology (MRT) Department, 5 Rue Bommel, ZAE Robert Steichen, L-4940 Hautcharage, Luxembourg
Interests: polymer physics; mechanical behavior; damage; orientation; processing; nanocomposite; SAXS; WAXS; tomography; structure; microscopy; interface
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Guest Editor
School of Traffic & Transportation Engineering, Key Laboratory of Traffic Safety on Track, Central South University, Changsha 410075, China
Interests: 3D printing; fibre-reinforced polymer composites; formulation; thermo environment
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The mechanical performance of polymer-based materials is often related to structural features that do not allow materials to efficiently accommodate the macroscopic strain to which they are exposed. In the case of neat polymers, these features are linked to their molecular structure and microstructure (molecular weight, branching, orientation, chain rigidity, entanglements, crosslinking, crystallinity, crystalline lamella thickness, etc.). Concerning polymer-based composites, the interfacial region between the reinforcing agent (nanofiller, short fibre, continuous fibre, etc.) drastically influences the mechanical properties. The lack of deformability or stress transfer relating to these structural features is at the origin of damage phenomena accommodating the macroscopic strain, which results in the extreme case of material failure. Knowledge of the relationships between the structure at different scales and the mechanical properties of polymer-based materials is of fundamental interest to improve material synthesis, formulation, (re)processing, and/or design. Extending the mechanical durability of polymer-based materials is beneficial for a sustainable future.

This Special Issue focuses on these relationships, especially but not exclusively in the case of emerging polymer-based materials such as bioplastics/biocomposites, vitrimers, self-healing polymer-based materials, 3D printed materials, and hybrid systems. The influence of ageing on the structure–mechanical property relationships is also of high interest for this issue.

Dr. Frédéric Addiego
Prof. Dr. Kui Wang
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Polymers is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • microstructure
  • molecular structure
  • composites
  • interface
  • characterisation
  • mechanical properties
  • damage
  • ageing

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Published Papers (1 paper)

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Research

34 pages, 9283 KiB  
Article
Analysis of the Impact of Cooling Lubricants on the Tensile Properties of FDM 3D Printed PLA and PLA+CF Materials
by Elvis Hozdić and Redžo Hasanagić
Polymers 2024, 16(15), 2228; https://doi.org/10.3390/polym16152228 - 5 Aug 2024
Viewed by 1392
Abstract
This study investigates the impact of infill density on the mechanical properties of fused deposition modeling (FDM) 3D-printed polylactic acid (PLA) and PLA reinforced with carbon fiber (PLA+CF) specimens, which hold industrial significance due to their applications in industries where mechanical robustness and [...] Read more.
This study investigates the impact of infill density on the mechanical properties of fused deposition modeling (FDM) 3D-printed polylactic acid (PLA) and PLA reinforced with carbon fiber (PLA+CF) specimens, which hold industrial significance due to their applications in industries where mechanical robustness and durability are critical. Exposure to cooling lubricants is particularly relevant for environments where these materials are frequently subjected to cooling fluids, such as manufacturing plants and machine shops. This research aims to explore insights into the mechanical robustness and durability of these materials under realistic operating conditions, including prolonged exposure to cooling lubricants. Tensile tests were performed on PLA and PLA+CF specimens printed with varying infill densities (40%, 60%, 80%, and 100%). The specimens underwent tensile testing before and after exposure to cooling lubricants for 7 and 30 days, respectively. Mechanical properties such as tensile strength, maximum force, strain, and Young’s modulus were measured to evaluate the effects of infill density and lubricant exposure. Higher infill densities significantly increased tensile strength and maximum force for both PLA and PLA+CF specimens. PLA specimens showed an increase in tensile strength from 22.49 MPa at 40% infill density to 45.00 MPa at 100% infill density, representing a 100.09% enhancement. PLA+CF specimens exhibited an increase from 23.09 MPa to 42.54 MPa, marking an 84.27% improvement. After 30 days of lubricant exposure, the tensile strength of PLA specimens decreased by 15.56%, while PLA+CF specimens experienced an 18.60% reduction. Strain values exhibited minor fluctuations, indicating stable elasticity, and Young’s modulus improved significantly with higher infill densities, suggesting enhanced material stiffness. Increasing the infill density of FDM 3D-printed PLA and PLA+CF specimens significantly enhance their mechanical properties, even under prolonged exposure to cooling lubricants. These findings have significant implications for industrial applications, indicating that optimizing infill density can enhance the durability and performance of 3D-printed components. This study offers a robust foundation for further research and practical applications, highlighting the critical role of infill density in enhancing structural integrity and load-bearing capacity. Full article
(This article belongs to the Special Issue Mechanical and Structural Properties of Polymer Materials)
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