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Polymers
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Advances in Mechanical Behavior of Polymers
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Advances in Mechanical Behavior of Polymers

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

Deadline for manuscript submissions: closed (25 January 2024) | Viewed by 8995

Special Issue Editors

Dr. Zi Chen

E-Mail Website
Guest Editor
Laboratory of Adaptive and Regenerative Biology, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA, USA
Interests: soft robotics; mechanical metamaterials; multistable structures; energy harvesting; mechanics of morphogenesis; biopolymers; cancer biophysics
Dr. Ying Li

E-Mail Website
Guest Editor
Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI, USA
Interests: multiscale modeling; computational materials design; mechanics and physics of soft matter; materials by design; machine learning
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Recent advances in polymer science have impacted a broad range of research fields and enabled numerous real-world applications in biomedical devices, cosmetics, bioplastic, bioimplants, synthetic food, packaging, etc. Innovations abound in designing and manufacturing new advanced polymeric materials with attractive physical properties and behaviors to overcome the existing challenges. Advanced manufacturing and experimental techniques have enabled the fabrication of polymers with appealing physical properties and behaviors. Meanwhile, the quantitative studies on stress–strain relationship and responsiveness to environmental changes feature the development and applications of advanced constitutive models, which can play a critical role in designing new polymeric materials.

Contributions related to the latest advances on the mechanical behaviors, properties, and functionalities of polymers and their applications and addressing, but not limited to, one of the following aspects are welcome to be submitted to this Special Issue:

  • process–structure–property relationships;
  • advanced manufacturing (including additive manufacturing);
  • shape-memory and/or shape-changing polymers;
  • self-healing polymers;
  • biopolymers;
  • bioinspired polymers;
  • theoretical modelling;
  • computer simulations.

Dr. Zi Chen
Dr. Ying Li
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

  • polymer
  • mechanical modeling
  • constitutive model
  • molecular dynamics
  • multiscale modeling
  • shape-changing polymers
  • shape-memory polymers
  • additive manufacturing

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (4 papers)

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Research

29 pages, 13956 KiB  
Article
Cyclic Thermomechanical Loading of Epoxy Polymer: Modeling with Consideration of Stress Accumulation and Experimental Verification
by Maxim Mishnev, Alexander Korolev, Alexander Zadorin and Vladimir Astashkin
Polymers 2024, 16(7), 910; https://doi.org/10.3390/polym16070910 - 26 Mar 2024
Cited by 3 | Viewed by 1252
Abstract
Developing a viscoelastic model for the cyclic thermomechanical loading of thermosetting polymers is the main goal of this study. The model includes memory for residual thermal stresses and can consider stress accumulation across many loading cycles. By considering stress accumulation, we can improve [...] Read more.
Developing a viscoelastic model for the cyclic thermomechanical loading of thermosetting polymers is the main goal of this study. The model includes memory for residual thermal stresses and can consider stress accumulation across many loading cycles. By considering stress accumulation, we can improve predictions and understand how thermosetting polymers’ stress–strain state changes under cyclic thermomechanical loading. This approach was validated through experimental verification to ensure its applicability in practical engineering scenarios. The experiment showed that the thermosetting polymer can accumulate stress during cycles of heating and mechanical loading during use. The results of the modeling and experiment are compared. The results have led to corrections in the way this model is applied to thermosetting polymers like the epoxy resin in this study. The corrected results matched well with the experimental measurements of stress under cyclic thermomechanical load, with a difference of only 1 to 6%. Full article
(This article belongs to the Special Issue Advances in Mechanical Behavior of Polymers)
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18 pages, 3717 KiB  
Article
Multifaceted Shape Memory Polymer Technology for Biomedical Application: Combining Self-Softening and Stretchability Properties
by Chandani Chitrakar, Marc Anthony Torres, Pedro Emanuel Rocha-Flores, Qichan Hu and Melanie Ecker
Polymers 2023, 15(21), 4226; https://doi.org/10.3390/polym15214226 - 25 Oct 2023
Cited by 4 | Viewed by 2276
Abstract
Thiol-ene polymers are a promising class of biomaterials with a wide range of potential applications, including organs-on-a-chip, microfluidics, drug delivery, and wound healing. These polymers offer flexibility, softening, and shape memory properties. However, they often lack the inherent stretchability required for wearable or [...] Read more.
Thiol-ene polymers are a promising class of biomaterials with a wide range of potential applications, including organs-on-a-chip, microfluidics, drug delivery, and wound healing. These polymers offer flexibility, softening, and shape memory properties. However, they often lack the inherent stretchability required for wearable or implantable devices. This study investigated the incorporation of di-acrylate chain extenders to improve the stretchability and conformability of those flexible thiol-ene polymers. Thiol-ene/acrylate polymers were synthesized using 1,3,5-triallyl-1,3,5-triazine-2,4,6(1H,3H,5H)-trione (TATATO), Trimethylolpropanetris (3-mercaptopropionate) (TMTMP), and Polyethylene Glycol Diacrylate (PEGDA) with different molecular weights (Mn 250 and Mn 575). Fourier Transform Infrared (FTIR) spectroscopy confirmed the complete reaction among the monomers. Uniaxial tensile testing demonstrated the softening and stretching capability of the polymers. The Young’s Modulus dropped from 1.12 GPa to 260 MPa upon adding 5 wt% PEGDA 575, indicating that the polymer softened. The Young’s Modulus was further reduced to 15 MPa under physiologic conditions. The fracture strain, a measure of stretchability, increased from 55% to 92% with the addition of 5 wt% PEGDA 575. A thermomechanical analysis further confirmed that PEGDA could be used to tune the polymer’s glass transition temperature (Tg). Moreover, our polymer exhibited shape memory properties. Our results suggested that thiol-ene/acrylate polymers are a promising new class of materials for biomedical applications requiring flexibility, stretchability, and shape memory properties. Full article
(This article belongs to the Special Issue Advances in Mechanical Behavior of Polymers)
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13 pages, 5023 KiB  
Article
Interface Characterization of Consolidated PPGF Tapes on PPGF Mat Material
by Andreas Kapshammer, Matei Constantin Miron, Lukas Dangl and Zoltan Major
Polymers 2023, 15(4), 935; https://doi.org/10.3390/polym15040935 - 14 Feb 2023
Cited by 2 | Viewed by 2459
Abstract
Laminated composites with thermoset matrices are already well established in major engineering fields like automotive and aviation. The primary drawbacks of such thermoset-based composites are the high cycle times required during manufacturing and their limited potential for recycling. Providing an alternative to thermoset-based [...] Read more.
Laminated composites with thermoset matrices are already well established in major engineering fields like automotive and aviation. The primary drawbacks of such thermoset-based composites are the high cycle times required during manufacturing and their limited potential for recycling. Providing an alternative to thermoset-based composites, thermoplastic matrix materials gained more and more momentum by addressing these previously mentioned drawbacks. The preferred manufacturing technique for these materials employs fiber-reinforced thermoplastic tapes consolidated and formed together with a compatible substrate. The most critical aspect for all these applications is the stress or load transfer between the thermoplastic tapes and the substrate. If the interface is too weak and fails prior to the substrate or tape, a high amount of theoretical mechanical performance is lost. The presented research investigates the influence of variations in manufacturing parameters, within the industrially relevant process window, on the interface strength of the final composite. The investigated composite material consists of PPGF UD tapes consolidated on a PPGF mat substrate. In particular, the influence of the consolidation parameters of pressure, temperature, and time are of special interest. The results of this work reveal a 400% increase in the measured mean strain energy release rate upon increasing the consolidation time from 60 s to 120 s at a consolidation temperature of 230 °C and a pressure of one bar. In contrast to this, an increase in the consolidation pressure, at constant temperature and time, leads to a minor improvement in the GC value of 20%. For testing and characterizing the corresponding interface properties, a mandrel peel testing setup was employed. Full article
(This article belongs to the Special Issue Advances in Mechanical Behavior of Polymers)
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12 pages, 3085 KiB  
Article
Laser Joining of Continuous Carbon Fiber-Reinforced PEEK and Titanium Alloy with High Strength
by Haipeng Wang, Zhongjing Ren and Yingchun Guan
Polymers 2022, 14(21), 4676; https://doi.org/10.3390/polym14214676 - 2 Nov 2022
Cited by 7 | Viewed by 2416
Abstract
The generation of high-performance heterojunctions between high-strength resin matrix composites and metals is of great significance for lightweight applications in fields such as aerospace and automobile engineering. Herein, we explored the feasibility of employing a laser joining process to achieve high-strength heterojunctions between [...] Read more.
The generation of high-performance heterojunctions between high-strength resin matrix composites and metals is of great significance for lightweight applications in fields such as aerospace and automobile engineering. Herein, we explored the feasibility of employing a laser joining process to achieve high-strength heterojunctions between continuous carbon fiber-reinforced PEEK (CCF30/PEEK) composites and titanium alloy (Ti6Al4V). A joint strength of over 50 MPa was achieved through constructing mechanical interlocking structures between CCF30/PEEK and Ti6Al4V. Tensile tests revealed that the fracture of joints was mainly ascribed to the detachment of carbon fibers from the resin matrix and the breakage of carbon fibers. The structures with different orientations and dimensions were confirmed to significantly influence the formation of interlocking structures near the joining interface and the resultant fracture strength of joints. It is believed that the results presented in this study provide a strong foundation for the production of high-performance heterojunctions. Full article
(This article belongs to the Special Issue Advances in Mechanical Behavior of Polymers)
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