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Polymers
Special Issues
Epoxy Composites: Processes and Applications II
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Epoxy Composites: Processes and Applications II

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

Deadline for manuscript submissions: closed (5 December 2022) | Viewed by 6310

Special Issue Editor

Prof. Dr. Dai-Soo Lee

E-Mail Website
Guest Editor
Department of Chemical Engineering, Chonbuk National University, Jeonju 54896, Korea
Interests: self-healing network polymers; recycling of crosslinked polymers; rheology; vitrimer; nanocomposites
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Epoxy resin is a typical thermosetting resin and has excellent heat resistance, chemical resistance, mechanical properties, and is widely used as a matrix of composite materials. In recent years, various technologies have been developed to realize self-healing characteristics in the cured epoxy resin of network structures by dynamic chemical bonds, so that the durability is improved, and the composites can be easily recycled. In addition, biomass-based epoxy resin manufacturing technologies are being developed. In this Special Issue, Epoxy Composites: Process and Applications II, we are going to gather recent progresses in the process and applications of the composite materials using various epoxy resins. Especially, the following topics on epoxy composites are welcomed:

  • Nanocomposites of epoxy resin and graphenes or carbon nanotubes
  • Self-healing of epoxy composites
  • Recycling of epoxy composites
  • Epoxy composites of renewable resources
  • High performance epoxy composites
  • Curing kinetics of epoxy composites
  • Chemorheology of epoxy composites
  • Hybrids of epoxy composites

Prof. Dr. Dai-Soo Lee
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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

  • epoxy resin
  • nanocomposites
  • self-healing
  • recycling
  • rheology
  • renewable resin
  • hybrid

Related Special Issue

Published Papers (2 papers)

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Research

14 pages, 2302 KiB  
Article
Effect of Immersion in Water or Alkali Solution on the Structures and Properties of Epoxy Resin
by Bin Wang, Dihui Li, Guijun Xian and Chenggao Li
Polymers 2021, 13(12), 1902; https://doi.org/10.3390/polym13121902 - 08 Jun 2021
Cited by 26 | Viewed by 3264
Abstract
The durability of fiber-reinforced polymer (FRP) composites is significantly dependent on the structures and properties of the resin matrix. In the present paper, the effects of physical or chemical interactions between the molecular chain of the epoxy resin matrix and water molecules or [...] Read more.
The durability of fiber-reinforced polymer (FRP) composites is significantly dependent on the structures and properties of the resin matrix. In the present paper, the effects of physical or chemical interactions between the molecular chain of the epoxy resin matrix and water molecules or alkaline groups on the water absorption, mechanical structures, and microstructures of epoxy resin samples were studied experimentally. The results showed that the water uptake curves of the epoxy resin immersed in water and an alkali solution over time presented a three-stage variation. At different immersion stages, the water uptake behavior of the resin showed unique characteristics owing to the coupling effects of the solution concentration gradient diffusion, molecular hydrolysis reaction, and molecular segment movement. In comparison with the water immersion, the alkali solution environment promoted the hydrolysis reaction of the epoxy resin molecular chain. After the immersion in water or the alkali solution for one month, the water uptake of the resin was close to saturate, and the viscoelasticity was observed to decrease significantly. The micropore and free volume space on the surface and in the interior of the resin gradually increased, while the original large-scale free volume space decreased. The tensile strength decreased to the lowest point after the immersion in water and the alkali solution for one month, and the decrease percentages at 20 °C and 60 °C water or 60 °C alkali solution were 24%, 28%, and 22%, respectively. Afterward, the tensile strength recovered with the further extension of immersion time. In addition, it can be found that the effect of the alkali solution and water on the tensile strength of the epoxy resin was basically the same. Full article
(This article belongs to the Special Issue Epoxy Composites: Processes and Applications II)
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15 pages, 2352 KiB  
Article
Kinetic Analysis of the Curing Process of Biobased Epoxy Resin from Epoxidized Linseed Oil by Dynamic Differential Scanning Calorimetry
by Diego Lascano, Alejandro Lerma-Canto, Vicent Fombuena, Rafael Balart, Nestor Montanes and Luis Quiles-Carrillo
Polymers 2021, 13(8), 1279; https://doi.org/10.3390/polym13081279 - 14 Apr 2021
Cited by 14 | Viewed by 2548
Abstract
The curing process of epoxy resin based on epoxidized linseed oil (ELO) is studied using dynamic differential scanning calorimetry (DSC) in order to determine the kinetic triplet (Ea, f(α) and A) at different heating rates. The [...] Read more.
The curing process of epoxy resin based on epoxidized linseed oil (ELO) is studied using dynamic differential scanning calorimetry (DSC) in order to determine the kinetic triplet (Ea, f(α) and A) at different heating rates. The apparent activation energy, Ea, has been calculated by several differential and integral isoconversional methods, namely Kissinger, Friedman, Flynn–Wall–Ozawa (FWO), Kissinger–Akahira–Sunose (KAS) and Starink. All methods provide similar values of Ea (between 66 and 69 kJ/mol), and this shows independence versus the heating rate used. The epoxy resins crosslinking is characterized by a multi-step process. However, for the sake of the simplicity and to facilitate the understanding of the influence of the oxirane location on the curing kinetic, this can be assimilated to a single-step process. The reaction model has a high proportion of autocatalytic process, fulfilling that αM is between 0 and αp and αM < αp∞. Using as reference the model proposed by Šesták–Berggren, by obtaining two parameters (n and m) it is possible to obtain, on the one hand, the kinetic parameters and, on the other hand, a graphical comparison of the degree of conversion, α, versus temperature (T) at different heating rates with the average n and m values of this model. The good accuracy of the proposed model with regard to the actual values obtained by DSC gives consistency to the obtained parameters, thus suggesting the crosslinking of the ELO-based epoxy has apparent activation energies similar to other petroleum-derived epoxy resins. Full article
(This article belongs to the Special Issue Epoxy Composites: Processes and Applications II)
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