Special Issue "Structure Property Relationship of Polymeric Materials"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Structure Analysis and Characterization".

Deadline for manuscript submissions: 15 January 2022.

Special Issue Editors

Prof. Dr. Gisbert Riess
E-Mail Website
Guest Editor
Chair of Chemistry of Polymeric Materials, Montanuniversität Leoben, 8700 Leoben, Austria
Interests: polymer chemistry; barrier properties; flame-retardant polymers; polymeric foam
Dr. Florian Arbeiter
E-Mail Website
Guest Editor
Materials Science and Testing of Polymers, Montanuniversitat Leoben, Leoben, Austria
Interests: fracture mechanics in polymers; application of fracture mechanics in additive manufacturing; impact fracture; fracture in multilayer systems
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

Structure–property relationships of polymers are key aspects for the development of new materials. Regardless of the base material (thermoplastic, elastomeric, or resin-based), the resulting structure and morphology play a key role in tailoring the material for the intended application. Therefore, it is necessary to understand the structure–property relationships as well as processing-induced changes in the morphology of polymeric materials in detail.

The aforementioned relationships depend on the type and concentration of components, the interaction between matrix and additives, and the processing techniques. All of these parameters determine the morphology and structure of the final material, and are crucial for final applications.

The Special Issue “Structure–Property Relationships of Polymeric Materials” focuses on any aspect of the production, structure, and properties of polymeric materials, with particular attention given to mechanical, barrier, flame-retardant, and insulation properties.

We kindly invite you to submit your work for this Special Issue. Experimental studies as well as theoretical investigations are appreciated. Full research papers, communications, and reviews are all welcome.

Prof. Dr. Gisbert Riess
Dr. Florian Arbeiter
Guest Editors

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 papers will be 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. Materials 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 2000 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

  • mechanical properties
  • barrier properties
  • insulation properties
  • flame-retardant polymers
  • processing techniques

Published Papers (4 papers)

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Research

Article
Resins for Frontal Photopolymerization: Combining Depth-Cure and Tunable Mechanical Properties
Materials 2021, 14(4), 743; https://doi.org/10.3390/ma14040743 - 05 Feb 2021
Viewed by 579
Abstract
Photopolymerization has undergone significant development in recent years. It enables fast and easy processing of materials with customized properties and allows precise printing of complex surface geometries. Nevertheless, photopolymerization is mainly applied to cure thin films since the low curing depth limits the [...] Read more.
Photopolymerization has undergone significant development in recent years. It enables fast and easy processing of materials with customized properties and allows precise printing of complex surface geometries. Nevertheless, photopolymerization is mainly applied to cure thin films since the low curing depth limits the fast production of large volumes. Frontal photopolymerization (FPP) is suitable to overcome these limitations so that curing of centimeter-thick (meth)acrylic layers can be accomplished within minutes by light induction only. Prerequisites, however, are the low optical density of the resin and bleaching ability of the photoinitiator. To date, tailored FPP-resins are not commercially available. This study discusses the potential of long-chain polyether dimethacrylates, offering high-temperature resistance and low optical density, as crosslinkers in photobleaching resins and investigates the mechanical properties of photofrontally-cured copolymers. Characteristics ranging from ductile to hard and brittle are observed in tensile tests, demonstrating that deep curing and versatile material properties are achieved with FPP. Analyzed components display uniform polymerization over a depth of four centimeters in Fourier transform infrared spectroscopy and swelling tests. Full article
(This article belongs to the Special Issue Structure Property Relationship of Polymeric Materials)
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Article
Optimization of Mechanical Properties and Damage Tolerance in Polymer-Mineral Multilayer Composites
Materials 2021, 14(4), 725; https://doi.org/10.3390/ma14040725 - 04 Feb 2021
Viewed by 529
Abstract
Talcum reinforced polypropylene was enhanced with a soft type of polypropylene in order to increase the impact strength and damage tolerance of the material. The soft phase was incorporated in the form of continuous interlayers, where the numbers of layers ranged from 64 [...] Read more.
Talcum reinforced polypropylene was enhanced with a soft type of polypropylene in order to increase the impact strength and damage tolerance of the material. The soft phase was incorporated in the form of continuous interlayers, where the numbers of layers ranged from 64 to 2048. A blend with the same material composition (based on wt% of the used materials) and the pure matrix material were investigated for comparison. A plateau in impact strength was reached by layered architectures, where the matrix layer thickness was as small or smaller than the largest talcum particles. The most promising layered architecture, namely, 512 layers, was subsequently investigated more thoroughly using instrumented Charpy experiments and tensile testing. In these tests, normalised parameters for stiffness and strength were obtained in addition to the impact strength. The multilayered material showed remarkable impact strength, fracture energy and damage tolerance. However, stiffness and strength were reduced due to the addition of the soft phase. It could be shown that specimens under bending loads are very compliant due to a stress-decoupling effect between layers that specifically reduces bending stiffness. This drawback could be avoided under tensile loading, while the increase in toughness remained high. Full article
(This article belongs to the Special Issue Structure Property Relationship of Polymeric Materials)
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Article
Analysis of the Fire Behavior of Polymers (PP, PA 6 and PE-LD) and Their Improvement Using Various Flame Retardants
Materials 2020, 13(24), 5756; https://doi.org/10.3390/ma13245756 - 16 Dec 2020
Viewed by 461
Abstract
The fire behavior of polymers is examined primarily with the time-dependent heat release rate (HRR) measured with a cone calorimeter. The HRR is used to examine the fire behavior of materials with and without flame retardants, especially Polypropylene (PP-Copo) and Polyethylene (PE-LD). Polypropylene [...] Read more.
The fire behavior of polymers is examined primarily with the time-dependent heat release rate (HRR) measured with a cone calorimeter. The HRR is used to examine the fire behavior of materials with and without flame retardants, especially Polypropylene (PP-Copo) and Polyethylene (PE-LD). Polypropylene is stored for up to 99 days under normal conditions and the heat release rate shows especially changes about 100 s after irradiation with cone calorimeter, which may be caused by aging effects. The effect of crosslinking to the burning behavior of PP was examined too. Polyamides (PA 6) are irradiated with a radiation intensity of 25 kW/m2 to 95 kW/m2 and fire-related principles between radiation intensity and time to ignition can be derived from the measurement results. In order to comprehensively investigate the fire behavior of PP (also with flame retardant additives), the samples were also exposed to a flame, according to UL 94 with small power (50 W) and is inflamed with the power of a few 100 W. The irradiation causes different trigger mechanisms for the flame retardant additives in a plastic than the flame exposure. It is shown that the compound, which is favorable for irradiation, is not necessarily good for flame exposure. It can be seen that expandable graphite alone or with the addition of other additives is a very effective flame retardant for PP. Full article
(This article belongs to the Special Issue Structure Property Relationship of Polymeric Materials)
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Article
Addition of Graphene Oxide in Different Stages of the Synthesis of Waterborne Polyurethane-Urea Adhesives and Its Influence on Their Structure, Thermal, Viscoelastic and Adhesion Properties
Materials 2020, 13(13), 2899; https://doi.org/10.3390/ma13132899 - 28 Jun 2020
Cited by 3 | Viewed by 641
Abstract
In this study, 0.04 wt % graphene oxide (GO) was added in different stages (before and after prepolymer formation, and during water addition) of the synthesis of waterborne polyurethane-urea dispersions (PUDs) prepared by using the acetone method. The structural, thermal, mechanical, viscoelastic, surface [...] Read more.
In this study, 0.04 wt % graphene oxide (GO) was added in different stages (before and after prepolymer formation, and during water addition) of the synthesis of waterborne polyurethane-urea dispersions (PUDs) prepared by using the acetone method. The structural, thermal, mechanical, viscoelastic, surface and adhesion properties of the polyurethane-ureas (PUUs) containing 0.04 wt % GO were studied. The addition of GO before and after prepolymer formation produced covalent bonds between the GO sheets and the NCO groups of the isocyanate, whereas the GO sheets were trapped between the polyurethane chains when added during water addition step. As a consequence, depending on the stage of the PUD synthesis in which GO was added, the degree of micro-phase separation between the hard and soft segments changed differently. The addition of GO before prepolymer formation changed more efficiently the polyurethane-urea structure, i.e., the covalently bonded GO sheets disturbed the interactions between the hard segments causing lower percentage of free urethane groups, higher crystallinity, lower storage modulus, higher yield stress and T-peel strength. The interactions between the GO sheets and the polymeric chains have been evidenced by plate-plate rheology, thermal gravimetric analysis and spectroscopy. On the other hand, physical interactions between GO and the polyurethane-urea chains were produced when GO was added in water during the synthesis, i.e., GO was acting as a nanofiller, which justified the improved mechanical properties and high lap-shear strength, but poor T-peel strength. Full article
(This article belongs to the Special Issue Structure Property Relationship of Polymeric Materials)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Structure-Property Relationship in Waterborne Polyurethane-Urea Adhesives Containing Differently Modified Graphene Oxide

Abstract: Amounts of 0.04 wt.% graphene oxide, reduced grahene oxide and amine-functionalized graphene oxide (GO, , rGO, A-GO) were added during prepolymer formation in the synthesis of waterborne polyurethane-urea dispersions (PUDs). The addition of GO and A-GO changed the degree of phase separation in PUDs due to the creation of covalent interactions between the oxygen and amine groups on the graphene oxide derivatives and the end NCO groups end of the prepolymer polyurethane. As a consequence, increased mechanical, thermal stability and adhesion of PUDs were obtained.

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