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Polymers
Special Issues
Frontiers in 3D and 4D Printing for Polymers
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Frontiers in 3D and 4D Printing for Polymers

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

Deadline for manuscript submissions: closed (30 September 2022) | Viewed by 5129

Special Issue Editors

Prof. Dr. Ignazio Blanco

E-Mail Website
Guest Editor
Department of Civil Engineering and Architecture, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
Interests: materials; polymers; thermal properties; nanocomposites; composites
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Gianluca Cicala

E-Mail Website
Guest Editor
Department of Civil Engineering and Architecture, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
Interests: materials; polymer; mechanical properties; additive manufacturing; 3D printing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues, 

In recent years, there has been rapid development in 3D and 4D printing technology pushed by all the chemists and materials’ engineers who deal with the design and production of manufacts, thus contributing to the development of this technology. Nowadays, both the production processes and research activities are affected by the use of 3D printing technology. In order to overcome the major limitation and cover as many fields of application as possible and expand the spectrum and employ of the printed objects in areas such as biomedical, mechanical, electronical and so on, the research is still on going. This Special Issue aims to mark the state of the art in 3D and 4D by hosting all those studies that propose advantages associated with rapid prototyping.

Prof. Dr. Ignazio Blanco
Prof. Dr. Gianluca Cicala
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 printing
  • 4D printing
  • fused deposition modelling
  • additive manufacturing
  • polymers
  • polymer composites
  • composites
  • rapid prototyping
  • filaments
  • particles

Published Papers (2 papers)

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Research

16 pages, 2667 KiB  
Article
Large Scale Vat-Photopolymerization of Investment Casting Master Patterns: The Total Solution
by Farzaneh Sameni, Basar Ozkan, Sarah Karmel, Daniel S. Engstrøm and Ehsan Sabet
Polymers 2022, 14(21), 4593; https://doi.org/10.3390/polym14214593 - 29 Oct 2022
Cited by 2 | Viewed by 2026
Abstract
The material properties and processing of investment casting patterns manufactured using conventional wax injection Molding and those manufactured by vat photopolymerization can be substantially different in terms of thermal expansion and mechanical properties, which can generate problems with dimensional accuracy and stability before [...] Read more.
The material properties and processing of investment casting patterns manufactured using conventional wax injection Molding and those manufactured by vat photopolymerization can be substantially different in terms of thermal expansion and mechanical properties, which can generate problems with dimensional accuracy and stability before and during ceramic shelling and shell failures during the burn-out of the 3D printed casting patterns. In this paper and for the first time, the monofunctional Acryloyl morpholine monomer was used for 3D printing of casting patterns, due to its thermoplastic-like behavior, e.g., softening by heat. However, the hydrophilic behavior of this polymer led to an incorporation of up to 60 wt% of Hexanediol diacrylate, to control the water absorption of the network, which to some extent, compromised the softening feature of Acryloyl morpholine. Addition of a powdered wax filler resulted in a delayed thermal decomposition of the polymer network, however, it helped to reduce the thermal expansion of the parts. The dimensional accuracy and stability of the wax-filled formulation indicated an excellent dimensional tolerance of less than ±130 µm. Finally, the 3D printed patterns successfully went through a burn out process with no damages to the ceramic shell. Full article
(This article belongs to the Special Issue Frontiers in 3D and 4D Printing for Polymers)
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16 pages, 3803 KiB  
Article
3D-Printed Soft Pneumatic Robotic Digit Based on Parametric Kinematic Model for Finger Action Mimicking
by Shumi Zhao, Ziwen Wang, Yisong Lei, Jie Zhang, Yuyao Li, Zeji Sun and Zidan Gong
Polymers 2022, 14(14), 2786; https://doi.org/10.3390/polym14142786 - 07 Jul 2022
Cited by 2 | Viewed by 2372
Abstract
A robotic digit with shape modulation, allowing personalized and adaptable finger motions, can be used to restore finger functions after finger trauma or neurological impairment. A soft pneumatic robotic digit consisting of pneumatic bellows actuators as biomimetic artificial joints is proposed in this [...] Read more.
A robotic digit with shape modulation, allowing personalized and adaptable finger motions, can be used to restore finger functions after finger trauma or neurological impairment. A soft pneumatic robotic digit consisting of pneumatic bellows actuators as biomimetic artificial joints is proposed in this study to achieve specific finger motions. A parametric kinematic model is employed to describe the tip motion trajectory of the soft pneumatic robotic digit and guide the actuator parameter design (i.e., the pressure supply, actuator material properties, and structure requirements of the adopted pneumatic bellows actuators). The direct 3D printing technique is adopted in the fabrication process of the soft pneumatic robotic digit using the smart material of thermoplastic polyurethane. Each digit joint achieves different ranges of motion (ROM; bending angles of distal, proximal, and metacarpal joint are 107°, 101°, and 97°, respectively) under a low pressure of 30 kPa, which are consistent with the functional ROM of a human finger for performing daily activities. Theoretical model analysis and experiment tests are performed to validate the effectiveness of the digit parametric kinematic model, thereby providing evidence-based technical parameters for the precise control of dynamic pressure dosages to achieve the required motions. Full article
(This article belongs to the Special Issue Frontiers in 3D and 4D Printing for Polymers)
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