Special Issue "Mechanical and Rheological Behaviour of Polymer-Based Systems"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: 15 January 2020.

Special Issue Editors

Prof. Dr. Marco Morreale
E-Mail Website
Guest Editor
Faculty of Engineering and Architecture, Kore University of Enna, 94100– Enna, Italy
Interests: green composites, biocomposites, biodegradable polymers, polymer processing, mechanical behaviour of polymer-based systems, rheological behaviour of polymer-based systems, nanocomposites, polymer blends, aging of polymer-based systems, asphalts
Special Issues and Collections in MDPI journals
Prof. Dr. Francesco Paolo La Mantia
E-Mail Website
Guest Editor
Dipartimento di Ingegneria, Università di Palermo INSTM, Firenze, Italy
Interests: polymer processing, mechanical behaviour of polymer-based systems, rheological behaviour of polymer-based systems, green composites, biocomposites, nanocomposites, biodegradable polymers, polymer blends, degradation and recycling of polymer-based systems
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

Polymer-based systems have been expanding their role and increasing in importance in current materials engineering, thanks to their outstanding versatility, which allows one to prepare new materials with tailored properties for the most varied applications. However, the first problems, which need to be overcome when designing new polymer-based products, regard processability. This particularly applies to thermoplastic polymers and can be further complicated by the presence of multiple phases, such as in the case of polymer blends, polymer composites containing fillers in the form of particles or short fibers, etc. Therefore, rheology plays a fundamental role in investigating the processability of new polymer-based systems, and rheological characterization requires more and more advanced techniques and interpretations of the results. This is not limited to thermoplastic systems but can apply also to thermoset resins and related composites (even containing, for instance, long fibers). At the same time, predicting and optimizing the processability of polymer-based systems is one of the fundamental aspects, another one being related to the mechanical properties of the obtained products. Depending on the final application, adequate mechanical properties (Young’s modulus, tensile strength, elongation at break, flexural modulus, impact strength, etc.) may be required. It may be often fundamental to find an optimal balance between several mechanical properties.

This Special Issue intends to assess the state-of-the-art and the recent advances in the field of the mechanical and rheological behaviour of polymer-based systems, focusing on effects related to new formulations, the presence of fillers, etc., as well as on the optimization of characterization techniques and the interpretation of results.

It is our pleasure to invite you to submit a manuscript to this Special Issue on the Mechanical and Rheological Behaviour of Polymer-Based Systems. Full papers, communications, and reviews are all welcome.

Prof. Dr. Marco Morreale
Prof. Dr. Francesco Paolo La Mantia
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 1800 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

  • rheology
  • mechanical properties
  • processing
  • polymer-based systems

Published Papers (3 papers)

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Research

Open AccessArticle
A Study of the Synergistic Interaction of Konjac Glucomannan/Curdlan Blend Systems under Alkaline Conditions
Materials 2019, 12(21), 3543; https://doi.org/10.3390/ma12213543 - 29 Oct 2019
Abstract
To improve the gelation performance of konjac glucomannan (KGM) thermo-irreversible gel in the condition of alkaline, this study investigated the interactions between KGM and curdlan (CUD) in terms of the sol state and gelation process. The apparent viscosity, rheological properties during heating and [...] Read more.
To improve the gelation performance of konjac glucomannan (KGM) thermo-irreversible gel in the condition of alkaline, this study investigated the interactions between KGM and curdlan (CUD) in terms of the sol state and gelation process. The apparent viscosity, rheological properties during heating and cooling, thermodynamic properties, gelation properties and water holding capacity of KGM/CUD blend systems in an alkaline environment were studied using physical property testing instruments and methods. The results showed that the viscosity of the KGM/CUD blended solution was greater than the value calculated from the ideal mixing rules in the condition of alkaline (pH = 10.58). As the proportion of CUD in the system increased, the intersection of storage modulus (G’) and loss modulus (G”) shifted to low frequencies, the relaxation time gradually increased, and the degree of entanglement of molecular chains between these two components gradually increased. The addition of CUD helped decrease the gelation temperature of KGM, increased the gelation rate and inhibited the thinning phenomenon of KGM gels at low temperatures (2–20 °C). The addition of CUD increased the hardness and gel strength of KGM but did not significantly improve the water holding capacity of the KGM/CUD blend gel. The process of mixing KGM and CUD improved the thermal stability of the gel. In summary, KGM/CUD exhibited excellent compatibility under alkaline conditions, and the blend systems produced a “viscosifying effect”. KC8 and KC5 show better thermal stability, low temperature resistance and gel strength compared to KGM. This blended gel can be used as a structural support material to provide reference for the development of konjac bionic vegetarian products. Full article
(This article belongs to the Special Issue Mechanical and Rheological Behaviour of Polymer-Based Systems)
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Open AccessArticle
Evaluate the Fatigue Life of CFRC Subjected to Coupled Thermo–Mechanical Loading
Materials 2019, 12(18), 2886; https://doi.org/10.3390/ma12182886 - 06 Sep 2019
Abstract
Mechanical properties of composites manufactured by high-temperature polymer polyether ether ketone (PEEK) with continuous reinforced fibers are closely dependent on ambient temperature variations. In order to effectively study fatigue failure behaviors of composites under the coupled thermo–mechanical loading, a well-established microscopic model based [...] Read more.
Mechanical properties of composites manufactured by high-temperature polymer polyether ether ketone (PEEK) with continuous reinforced fibers are closely dependent on ambient temperature variations. In order to effectively study fatigue failure behaviors of composites under the coupled thermo–mechanical loading, a well-established microscopic model based on a representative volume element (RVE) is proposed in this paper. Stiffness degradation behaviors of the composite laminates at room and elevated temperatures are firstly investigated, and their failure strengths are compared with experimental data. To describe the fatigue behaviors of composites with respect to complex external loading and ambient temperature variations, a new fatigue equation is proposed. A good consistency between theoretical results and experimental data was found in the cases. On this basis, the temperature cycling effects on the service life of composites are also discussed. Microscopic stress distributions of the RVE are also discussed to reveal their fatigue failure mechanisms. Full article
(This article belongs to the Special Issue Mechanical and Rheological Behaviour of Polymer-Based Systems)
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Open AccessArticle
A Study on Exfoliation of Expanded Graphite Stacks in Candelilla Wax
Materials 2019, 12(16), 2530; https://doi.org/10.3390/ma12162530 - 08 Aug 2019
Abstract
A novel, green route for pre-exfoliation of graphite based on a biodegradable polymer and high-power ultrasound is presented. Candelilla wax (CW), derived from the leaves of the candelilla plant, has been used for the first time as a natural non aqueous medium to [...] Read more.
A novel, green route for pre-exfoliation of graphite based on a biodegradable polymer and high-power ultrasound is presented. Candelilla wax (CW), derived from the leaves of the candelilla plant, has been used for the first time as a natural non aqueous medium to induce the pre-exfoliation of expanded graphite (EG) under ultrasonic irradiation in an economical way. The proposed method uses also D-limonene as a natural organic solvent for reducing viscosity and increasing the affinity between the polar groups of EG and candelilla wax, thus improving the intercalation/exfoliation of EG. The quality of dispersion of the nanofiller in the natural wax matrix has been evaluated using multiple techniques. The addition of EG to wax and use of ultrasonic treatment leads to a reduced crystallinity, probably due to restrictions of the molecular movements, improved thermal stability of wax, and to an increased shear thinning exponent, which are all indicative of a high degree of EG dispersion. The ultrasonic dynamic mechanical results suggest a reduction in the cluster size and a better filler dispersion in the wax matrix promoted by polar or chemical reactions between the CW fractions and the graphite stacks, which was observed by XPS analysis. The results were compared to those obtained with paraffin, a synthetic wax, and confirmed the dispersion improvement obtained by using natural wax as a pre-exfoliating medium. Full article
(This article belongs to the Special Issue Mechanical and Rheological Behaviour of Polymer-Based Systems)
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