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Polymers
Special Issues
Mechanical Behavior of Polymers: Processing and Characterization
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Mechanical Behavior of Polymers: Processing and Characterization

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

Deadline for manuscript submissions: closed (15 June 2023) | Viewed by 9334

Special Issue Editors

Dr. Jiří Hajnyš

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Guest Editor
Faculty of Mechanical Engineering, Department of Machining, Assembly and Engineering Metrology, VSB - Technical University of Ostrava, 70800 Ostrava, Czech Republic
Interests: 3D printing; additive manufacturing; advanced materials; computer-aided engineering; metrology; SLM technology; post-processing; SLS technology
Special Issues, Collections and Topics in MDPI journals
Dr. Jakub Mesicek

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Guest Editor
Faculty of Mechanical Engineering, Department of Machining, Assembly and Engineering Metrology, VSB - Technical University of Ostrava, 70800 Ostrava, Czech Republic
Interests: 3D printing; additive manufacturing; topology optimization; advanced materials; computer-aided engineering; SLS technology; SLM technology; post-processing
Special Issues, Collections and Topics in MDPI journals
Dr. Marek Pagáč

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Guest Editor
Department of Machining, Assembly and Engineering Technology, Faculty of Mechanical Engineering, VSB-TU Ostrava, 17. Listopadu 2172/15, 708 00 Ostrava-Poruba, Czech Republic
Interests: 3D printing; additive manufacturing; advanced materials; computer-aided engineering; SLM; SLA; DLP; design
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Jana Petru

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Guest Editor
Faculty of Mechanical Engineering, Department of Machining, Assembly and Engineering Metrology, VSB - Technical University of Ostrava, 70800 Ostrava, Czech Republic
Interests: progressive machining; technology; materials; engineering metrology; additive technology; 3D printing
Special Issues, Collections and Topics in MDPI journals
Dr. Radim Halama

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Guest Editor
Department of Applied Mechanics, Faculty of Mechanical Engineering, VSB - Technical University of Ostrava, Ostrava 70800, Czech Republic
Interests: 3D printing; additive manufacturing; advanced materials; finite element method; fatigue of materials; cyclic plasticity; viscoplasticity

Special Issue Information

Dear Colleagues, 

This Special Issue on the “Mechanical Behavior of Polymers: Processing and Characterization” is devoted to presenting the current status and progression of knowledge regarding the properties of polymer-based materials produced by different technologies. Over the past few years, polymer science has played a crucial role in an enormous number of research fields, such as, medical, food, cosmetics, chemicals, bioplastic, packaging, etc., for which new advanced polymeric materials have been developed to overcome the existing daily challenges. The increasing interest in these kinds of materials is due to their wide range of properties and applications; moreover, there are a lot of opportunities for material production thanks to the manufacturing technologies that are yet to come. The investigation of stress–strain behavior as well as its description by advanced constitutive models is also covered by this Special Issue, including quasistatic, cyclic, impact or thermo-mechanical loading. Both original contributions and comprehensive reviews are welcome.

The Special Issue aims to investigate all kinds of polymeric materials, including but not limited to, their mechanical properties, production, etc.

Dr. Jiří Hajnyš
Dr. Jakub Mesicek
Dr. Marek Pagáč
Prof. Dr. Jana Petru
Dr. Radim Halama
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 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

  • 3D/4D printing
  • additive manufacturing
  • advanced polymeric materials
  • chemical composition
  • creep
  • fatigue
  • machining of polymers
  • measurement
  • mechanical properties
  • viscoplasticity microstructure
  • vat photopolymerization
  • multi-material properties
  • multi-physical properties
  • multi-material 3D printing
  • polymer-based materials
  • shape memory polymers
  • smart materials
  • surface integrity
  • synthetic methods
  • theory and simulation
  • pre-/during-/post-treatment

Published Papers (4 papers)

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Research

13 pages, 4970 KiB  
Article
Preparation and Characterization of Polypropylene/Sepiolite Nanocomposites for Potential Application in Automotive Lightweight Materials
by Guofeng Wu, Liang Lei, Yijian Wu, Fei Yu, Jianjun Li and Hui He
Polymers 2023, 15(4), 802; https://doi.org/10.3390/polym15040802 - 05 Feb 2023
Cited by 2 | Viewed by 1535
Abstract
Polypropylene (PP)/sepiolite nanocomposites were prepared using the melt blending technique. The effects of nano-sepiolite content on the mechanical property, thermal property, crystallinity, morphology and rheological property of PP/sepiolite nanocomposites were investigated. The organic modified sepiolites (OSep) were dispersed evenly in PP matrix after [...] Read more.
Polypropylene (PP)/sepiolite nanocomposites were prepared using the melt blending technique. The effects of nano-sepiolite content on the mechanical property, thermal property, crystallinity, morphology and rheological property of PP/sepiolite nanocomposites were investigated. The organic modified sepiolites (OSep) were dispersed evenly in PP matrix after surface treatment. The addition of OSep improved the storage modulus and thermal stability, showing a strong interaction between OSep and PP matrix. With the increase of OSep content, the fluidity of PP/OSep composites first increased due to the lubrication of surface modifiers and then decreased due to the interaction between OSep and PP. The size of the toughening agent elastomer first increased and then decreased, and the impact notched strength of PP/Osep composites first decreased and then increased. The loading of OSep also reduced the crystallinity and shrinkage rate of PP. PP/OSep nanocomposites have potential applications in high-performance automotive lightweight materials. Full article
(This article belongs to the Special Issue Mechanical Behavior of Polymers: Processing and Characterization)
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25 pages, 17217 KiB  
Article
Acoustic Emission Signal Characterisation of Failure Mechanisms in CFRP Composites Using Dual-Sensor Approach and Spectral Clustering Technique
by Michal Šofer, Pavel Šofer, Marek Pagáč, Anastasia Volodarskaja, Marek Babiuch and Filip Gruň
Polymers 2023, 15(1), 47; https://doi.org/10.3390/polym15010047 - 22 Dec 2022
Cited by 5 | Viewed by 1480
Abstract
The characterisation of failure mechanisms in carbon fibre-reinforced polymer (CFRP) materials using the acoustic emission (AE) technique has been the topic of a number of publications. However, it is often challenging to obtain comprehensive and reliable information about individual failure mechanisms. This situation [...] Read more.
The characterisation of failure mechanisms in carbon fibre-reinforced polymer (CFRP) materials using the acoustic emission (AE) technique has been the topic of a number of publications. However, it is often challenging to obtain comprehensive and reliable information about individual failure mechanisms. This situation was the impetus for elaborating a comprehensive overview that covers all failure mechanisms within the framework of CFRP materials. Thus, we performed tensile and compact tension tests on specimens with various stacking sequences to induce specific failure modes and mechanisms. The AE activity was monitored using two different wideband AE sensors and further analysed using a hybrid AE hit detection process. The datasets received from both sensors were separately subjected to clustering analysis using the spectral clustering technique, which incorporated an unsupervised k-means clustering algorithm. The failure mechanism analysis also included a proposed filtering process based on the power distribution across the considered frequency range, with which it was possible to distinguish between the fibre pull-out and fibre breakage mechanisms. This functionality was particularly useful in cases where it was evident that the above-mentioned damage mechanisms exhibited very similar parametric characteristics. The results of the clustering analysis were compared to those of the scanning electron microscopy analysis, which confirmed the conclusions of the AE data analysis. Full article
(This article belongs to the Special Issue Mechanical Behavior of Polymers: Processing and Characterization)
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17 pages, 4402 KiB  
Article
Characterization of 3D Printed Polylactic Acid by Fused Granular Fabrication through Printing Accuracy, Porosity, Thermal and Mechanical Analyses
by Luca Fontana, Alberto Giubilini, Rossella Arrigo, Giulio Malucelli and Paolo Minetola
Polymers 2022, 14(17), 3530; https://doi.org/10.3390/polym14173530 - 28 Aug 2022
Cited by 9 | Viewed by 2421
Abstract
Fused Granular Fabrication (FGF) or screw-extrusion based 3D printing for polymers is a less diffused alternative to filament-based Additive Manufacturing (AM). Its greatest advantage lies in superior sustainability; in fact, polymer granules can be used to directly feed an FGF printer, reducing the [...] Read more.
Fused Granular Fabrication (FGF) or screw-extrusion based 3D printing for polymers is a less diffused alternative to filament-based Additive Manufacturing (AM). Its greatest advantage lies in superior sustainability; in fact, polymer granules can be used to directly feed an FGF printer, reducing the time, cost and energy of producing a part. Moreover, with this technology, a circular economy approach involving the use of pellets made from plastic waste can be easily implemented. Polylactic Acid (PLA) pellets were processed at different printing speeds and with different infill percentages on a customized version of a commercial Prusa i3 Plus 3D printer modified with a Mahor screw extruder. For the characterization of the 3D printed samples, rheological, thermal, mechanical and porosity analyses were carried out. In addition, the energy consumption of the 3D printer was monitored during the production of the specimens. The results showed that a higher printing speed leads to lower energy consumption, without compromising material strength, whereas a slower printing speed is preferable to increase material stiffness. Full article
(This article belongs to the Special Issue Mechanical Behavior of Polymers: Processing and Characterization)
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16 pages, 3398 KiB  
Article
Effect of Additives and Print Orientation on the Properties of Laser Sintering-Printed Polyamide 12 Components
by Lucie Zárybnická, Jana Petrů, Pavel Krpec and Marek Pagáč
Polymers 2022, 14(6), 1172; https://doi.org/10.3390/polym14061172 - 15 Mar 2022
Cited by 16 | Viewed by 2910
Abstract
3D printing, also known as additive manufacturing, is becoming increasingly popular for prototype processing in industrial practice. Laser sintering, which is a laser powder bed fusion technique, is a versatile and common 3D printing technology, which enables compact and high-quality products. Polyamide 12, [...] Read more.
3D printing, also known as additive manufacturing, is becoming increasingly popular for prototype processing in industrial practice. Laser sintering, which is a laser powder bed fusion technique, is a versatile and common 3D printing technology, which enables compact and high-quality products. Polyamide 12, a popular 3D printing material, provides reliable mechanical and thermal properties. Weaknesses in applying this technology for polyamide 12 include incomplete information regarding the application of various types of additives and different printing orientations with respect to the properties. This study aimed to investigate the influence of various additives (including carbon fiber, glass fiber, flame retardant, and aluminum powder) combined with polyamide 12, using processing of predefined powder refreshing mixture on the properties of a finished product. The thermal, surface, and mechanical properties of samples printed with five different polyamides 12-based powders at three different print orientations were investigated. It was found that the inclusion of additives decreases the tensile strength and increases the surface roughness of printed components—however, the toughness increases. The results can assist designers in selecting an appropriate material that will produce a finished part with the required properties for a given application. Full article
(This article belongs to the Special Issue Mechanical Behavior of Polymers: Processing and Characterization)
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