Mechanical and Structure–Property Relationships of Polymer Composites II

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

Deadline for manuscript submissions: 25 October 2024 | Viewed by 2160

Special Issue Editor

Department of Chemistry, University of North Carolina Chapel Hill, Chapel Hill, NC 27599, USA
Interests: polymer physics; polymer reactions; polymer composite; graphene; computation; molecular simulation; 2D material; soft material
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Polymer composites comprise a combination of regular polymer materials with other components, such as inorganic fillers (glass, carbon, metal particles/fibres/sheets, etc.), other polymeric components (Kevlar, cellulose, etc.) or even liquid/gases. These combinations, implemented through chemical/physical connection between different components, lead to rather complex phase structures at the micro/nanoscale and exhibit unique mechanical responses to external stimuli.

This Special Issue will present the latest findings from the research community in this field to promote a greater understanding and improved design of microscopic phase structures required for the obtainment of mechanical properties for many advanced applications.

Dr. Zilu Wang
Guest Editor

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Keywords

  • polymer composites
  • mechanical property
  • phase structure
  • filler
  • nanomaterial
  • smart material

Published Papers (3 papers)

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Research

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11 pages, 4003 KiB  
Article
Enhanced Thermal Conductivity of High-Density Polyethylene Composites with Hybrid Fillers of Flaky and Spherical Boron Nitride Particles
by Zhenliang Gao, Yiding Wang, Baogang Zhang, Li Liu and Xianhu Liu
Polymers 2024, 16(2), 268; https://doi.org/10.3390/polym16020268 - 18 Jan 2024
Cited by 1 | Viewed by 956
Abstract
The synergistic effect between different fillers plays a crucial role in determining the performance of composites. In this work, spherical boron nitride (BN) and flaky BN are used as hybrid fillers to improve the thermal conductivity (TC) of high-density polyethylene (HDPE) composites. A [...] Read more.
The synergistic effect between different fillers plays a crucial role in determining the performance of composites. In this work, spherical boron nitride (BN) and flaky BN are used as hybrid fillers to improve the thermal conductivity (TC) of high-density polyethylene (HDPE) composites. A series of HDPE composites were prepared by adjusting the mass ratio (1:0, 4:1, 2:1, 1:1, 1:2, 1:4, and 0:1) of spherical BN and flaky BN. The SEM results indicate that the spherical BN (with a particle size of 3 μm) effectively filled the gaps between the flaky BN (with a particle size of 30 μm), leading to the formation of more continuous heat conduction paths with the composite. Remarkably, when the mass ratio of spherical BN to flaky BN was set to 1:4 (with a total BN filling amount of 30 wt%), the TC of the composite could reach up to 1.648 Wm−1K−1, which is obviously higher than that of the composite containing a single filler, realizing the synergistic effect of the hybrid fillers. In addition, the synergistic effect of fillers also affects the thermal stability and crystallization behavior of composites. This work is of great significance for optimizing the application of hybrid BN fillers in the field of thermal management. Full article
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23 pages, 6451 KiB  
Article
Tribological Investigation of Glass Fiber Reinforced Polymer Composites against 52100 Chrome Alloy Steel Based on ELECTRE Decision-Making Method
by Corina Birleanu, Mircea Cioaza, Florina Serdean, Marius Pustan, Paul Bere and Glad Contiu
Polymers 2024, 16(1), 62; https://doi.org/10.3390/polym16010062 - 23 Dec 2023
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Abstract
Fibers play an important role when studying the tribological behavior of reinforced friction composites. The purpose of the current research is to develop a glass fiber reinforced polymer (GFRP) recipe with improved tribological properties as well as to find the composites with the [...] Read more.
Fibers play an important role when studying the tribological behavior of reinforced friction composites. The purpose of the current research is to develop a glass fiber reinforced polymer (GFRP) recipe with improved tribological properties as well as to find the composites with the optimal tribological behavior. A ball-on-disc tribometer was used to perform dry sliding friction testing, the obtained results were then analyzed with the ELECTRE (ELimination Et Choix Traduisant la REalite-elimination and choice translating the reality) method based on a utility matrix having process parameters the applied load, sliding velocity, and weight percentage of the fiber content. The ELECTRE method was chosen to find the optimal tribological parameters, with respect to more performance criteria, because it is one of the best multiple criteria decision-making methods. The optimal combination of parameters for the multi-response characteristics of the investigated friction composite was at an applied load of 10 N, a sliding velocity of 0.1 ms−1 and a 54% weight fiber content. The results showed that the addition of glass fiber (GF) content did not considerably improve the tribological behavior of the friction composites. In addition, from the nano focus–optical 3D scanning electron microscopy, images of the friction, tested friction and wear composites, plate formation, fiber-matrix delamination, fiber pull-out, and matrix cracking and damage, various wear mechanisms were identified. Full article
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Review

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25 pages, 9988 KiB  
Review
Recent Developments in Nanocomposite Membranes Based on Carbon Dots
by Shuheng He, Yiding Meng, Jiali Liu, Dali Huang, Yifang Mi and Rong Ma
Polymers 2024, 16(11), 1481; https://doi.org/10.3390/polym16111481 - 23 May 2024
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Abstract
Carbon dots (CDs) have aroused colossal attention in the fabrication of nanocomposite membranes ascribed to their ultra-small size, good dispersibility, biocompatibility, excellent fluorescence, facile synthesis, and ease of functionalization. Their unique properties could significantly improve membrane performance, including permeance, selectivity, and antifouling ability. [...] Read more.
Carbon dots (CDs) have aroused colossal attention in the fabrication of nanocomposite membranes ascribed to their ultra-small size, good dispersibility, biocompatibility, excellent fluorescence, facile synthesis, and ease of functionalization. Their unique properties could significantly improve membrane performance, including permeance, selectivity, and antifouling ability. In this review, we summarized the recent development of CDs-based nanocomposite membranes in many application areas. Specifically, we paid attention to the structural regulation and functionalization of CDs-based nanocomposite membranes by CDs. Thus, a detailed discussion about the relationship between the CDs’ properties and microstructures and the separation performance of the prepared membranes was presented, highlighting the advantages of CDs in designing high-performance separation membranes. In addition, the excellent optical and electric properties of CDs enable the nanocomposite membranes with multiple functions, which was also presented in this review. Full article
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