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Polymers
Special Issues
Recent Advances of Polymer Processing and Molding
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Recent Advances of Polymer Processing and Molding

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

Deadline for manuscript submissions: closed (25 July 2023) | Viewed by 2853

Special Issue Editors

Dr. Mingyong Zhou

E-Mail Website
Guest Editor
College of Mechanical and Electrical Engineering, Central South University, Changsha, China
Interests: polymer processing; injection molding; molecular dynamics simulation; microfluidic chip; polymer–metal hybrids
Prof. Dr. Can Weng

E-Mail Website
Guest Editor
1. College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
2. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China
Interests: micro-injection molding; precision manufacturing; bionic structure design and molding; numerical simulation of the molding process
Dr. Lei Chen

E-Mail Website
Guest Editor
School of Mechanical Engineering, Dongguan University of Technology, Dongguan, China
Interests: polymer nanocomposites; micro-injection molding; microlens array

Special Issue Information

Dear Colleagues,

Polymer materials and their products have been essential components of commodities since the early days of humankind. Advanced polymer processing and molding technology has received extensive attention due to its customizability and unique control of complex external fields, including temperature and pressure. It has been widely applied in various fields, especially in the fabrication of precision parts in MEMS (micro-gear, micro-optical element, etc.), flexible electronic devices, lightweight structures for automotive components (polymer–metal hybrids, polymer composites, etc.), and functional devices for biomedical engineering (microfluidic chip, micro-needle, and other medical consumables).

The aim of this Special Issue is to publish high-quality research papers focusing on advanced polymer processing and precision molding technologies, including but not limited to fiber-reinforced thermoplastic composites, multifunctional surface/interface/materials, rotation extrusion, micro injection molding, soft lithography, hot embossing, 3D printing technology, and computational methods (including the molecular dynamics simulation and finite elements coupled methods) for processing parameters or structure optimization.

Promising research works on recent advances in structure design, experimental discovery, and processing simulation are welcome for submission.

Dr. Mingyong Zhou
Prof. Dr. Can Weng
Dr. Lei Chen
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

  • thermoplastic composites
  • injection molding
  • hot embossing
  • nano imprinting
  • processing simulation
  • polymer MEMS
  • light-weight structure
  • biomedical device

Published Papers (2 papers)

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Research

10 pages, 4208 KiB  
Article
Material-Preserving Extrusion of Polyamide on a Twin-Screw Extruder
by Christoph Schall, Matthias Altepeter, Volker Schöppner, Sven Wanke and Marina Kley
Polymers 2023, 15(4), 1033; https://doi.org/10.3390/polym15041033 - 19 Feb 2023
Cited by 2 | Viewed by 1433
Abstract
In the context of plastics recycling, plastics are processed several times. With each new melting and extrusion the plastic is damaged, which can have a negative effect on product properties. To counteract material damage, special additives such as chain extenders can be used, [...] Read more.
In the context of plastics recycling, plastics are processed several times. With each new melting and extrusion the plastic is damaged, which can have a negative effect on product properties. To counteract material damage, special additives such as chain extenders can be used, which are intended to lead to post-polymerization during processing. A linear chain extension is important here, as branching and crosslinking can lead to uncontrolled changes in the plastic’s properties. To investigate the suitability of specialized linear chain extenders for polyamides, a polyamide-6 was processed several times and the molar mass distribution was evaluated after each extrusion cycle. Three series of tests were carried out. First, the plastic was regranulated five times without additives and twice with different concentrations of chain extenders on a twin-screw extruder. The results of the study show that not only can molar mass degradation be prevented with the appropriate additive, it is even possible to achieve a material buildup during processing. In our experiments, the polydispersity of the molar mass distribution remained nearly identical despite multiple extrusions. Thus, reactive extrusion makes it possible for the corresponding plastics to be processed several times without the molar mass decreasing. If a sufficiently pure material flow can be ensured during recycling, the number of possible reprocessings of the plastic can be significantly increased without the need to add virgin material. Full article
(This article belongs to the Special Issue Recent Advances of Polymer Processing and Molding)
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14 pages, 6959 KiB  
Article
Initial Crystallization Effects in Coarse-Grained Polyethylene Systems After Uni- and Biaxial Stretching in Blow-Molding Cooling Scenarios
by Dirk Grommes, Martin R. Schenk, Olaf Bruch and Dirk Reith
Polymers 2022, 14(23), 5144; https://doi.org/10.3390/polym14235144 - 26 Nov 2022
Cited by 1 | Viewed by 1044
Abstract
This study investigates the initial stage of the thermo-mechanical crystallization behavior for uni- and biaxially stretched polyethylene. The models are based on a mesoscale molecular dynamics approach. We take constraints that occur in real-life polymer processing into account, especially with respect to the [...] Read more.
This study investigates the initial stage of the thermo-mechanical crystallization behavior for uni- and biaxially stretched polyethylene. The models are based on a mesoscale molecular dynamics approach. We take constraints that occur in real-life polymer processing into account, especially with respect to the blowing stage of the extrusion blow-molding process. For this purpose, we deform our systems using a wide range of stretching levels before they are quenched. We discuss the effects of the stretching procedures on the micro-mechanical state of the systems, characterized by entanglement behavior and nematic ordering of chain segments. For the cooling stage, we use two different approaches which allow for free or hindered shrinkage, respectively. During cooling, crystallization kinetics are monitored: We precisely evaluate how the interplay of chain length, temperature, local entanglements and orientation of chain segments influence crystallization behavior. Our models reveal that the main stretching direction dominates microscopic states of the different systems. We are able to show that crystallization mainly depends on the (dis-)entanglement behavior. Nematic ordering plays a secondary role. Full article
(This article belongs to the Special Issue Recent Advances of Polymer Processing and Molding)
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