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Polymers
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Polymer Blends and Injection Molding
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Polymer Blends and Injection Molding

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 August 2023) | Viewed by 12873

Special Issue Editors

Prof. Dr. Jiquan Li

E-Mail Website
Guest Editor
1. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
2. Taizhou Institute, Zhejiang University of Technology, Taizhou 318014, China
Interests: manufacturing of polymer products; Intelligent manufacturing in polymer molding; advanced mold technology innovations such as rapid change of mold temperature and gas assist
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Shaofei Jiang

E-Mail Website
Guest Editor
College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
Interests: mechanical engineering; injection molded products; conceptual design; mechatronics; design structure matrix
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Injection molding is one of the most important mass production methods of plastic parts. The design and optimization of the molding process are important to obtain high-quality products. This special issue will focus on polymer material synthesis, characterization, injection molding design, simulation techniques, improving the process efficiency and enhancing product sustainability.

It is with great pleasure that we invite you to submit a manuscript related to injection molding for this Special Issue. Remarkable contributions including research articles, communications and reviews from experts all over the world are welcome.

Prof. Dr. Jiquan Li
Prof. Dr. Shaofei Jiang
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

  • injection molding
  • intelligent manufacturing in polymer molding
  • mold design
  • molding process
  • advanced polymer forming
  • design methodologies for polymer forming
  • design methodologies for forming equipment

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Published Papers (4 papers)

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Research

17 pages, 4763 KiB  
Article
A Unified High-Order Semianalytical Model and Numerical Simulation for Bistable Polymer Composite Structures
by Min Sun, Weiliang Gao, Zheng Zhang, Hongcheng Shen, Yisong Zhou, Huaping Wu and Shaofei Jiang
Polymers 2022, 14(4), 818; https://doi.org/10.3390/polym14040818 - 20 Feb 2022
Cited by 7 | Viewed by 2581
Abstract
Bistable polymer composite structures are morphing shells that can change shape and maintain two stable configurations. At present, mainly two types of bistable polymer composite structures are being studied: cross-ply laminates and antisymmetric cylindrical shells. This paper proposes a unified semianalytical model based [...] Read more.
Bistable polymer composite structures are morphing shells that can change shape and maintain two stable configurations. At present, mainly two types of bistable polymer composite structures are being studied: cross-ply laminates and antisymmetric cylindrical shells. This paper proposes a unified semianalytical model based on the extensible deformation assumption and nonlinear theory of plates and shells to predict bistability. Moreover, the higher-order theoretical model is extended for better prediction accuracy, while the number of degrees of freedom is not increased; this ensures a lower computational cost. Finally, based on these theoretical models, the main factors affecting the stable characteristic of the two bistable polymer composite structures are determined by comparing the models of various orders. The main challenges in describing the bistable behavior, such as bifurcation points and the curvatures of stable states, are addressed through prediction of the corner transversal displacement in stable configurations. The results obtained from the theoretical model are validated through nonlinear finite element analysis. Full article
(This article belongs to the Special Issue Polymer Blends and Injection Molding)
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15 pages, 45058 KiB  
Article
Ultrahigh and Tunable Electromagnetic Interference Shielding Performance of PVDF Composite Induced by Nano-Micro Cellular Structure
by Yang Yang, Shuiping Zeng, Xiping Li, Zhonglue Hu and Jiajia Zheng
Polymers 2022, 14(2), 234; https://doi.org/10.3390/polym14020234 - 7 Jan 2022
Cited by 13 | Viewed by 2421
Abstract
Lightweight and efficient electromagnetic interference (EMI) shielding materials play a vital role in protecting high-precision electronic devices and human health. Porous PVDF/CNTs/urchin-like Ni composites with different cell sizes from nanoscale to microscale were fabricated through one-step supercritical carbon dioxide (CO2) foaming. [...] Read more.
Lightweight and efficient electromagnetic interference (EMI) shielding materials play a vital role in protecting high-precision electronic devices and human health. Porous PVDF/CNTs/urchin-like Ni composites with different cell sizes from nanoscale to microscale were fabricated through one-step supercritical carbon dioxide (CO2) foaming. The electrical conductivity and electromagnetic interference (EMI) shielding performance of the composites with different cell sizes were examined in detail. The results indicated that the nanoscale cell structure diminishes the EMI shielding performance of the composite, whereas the microscale cell structure with an appropriate size is beneficial for improving the EMI shielding performance. A maximum EMI shielding effectiveness (SE) of 43.4 dB was achieved by the composite foams which is about twice that of the solid composite. Furthermore, as the supercritical CO2 foaming process reduces the density of the composite by 25–50%, the EMI SSE (specific shielding effectiveness)/t(thickness) of the composite reaches 402 dB/(g/cm2), which is the highest value of polymer foam obtained to the best of the authors’ knowledge. Finally, compression tests were performed to show that the composites still maintained excellent mechanical properties after the supercritical CO2 foaming process. Full article
(This article belongs to the Special Issue Polymer Blends and Injection Molding)
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18 pages, 12077 KiB  
Article
Probing the Nanoscale Heterogeneous Mixing in a High-Performance Polymer Blend
by Alexander Paul Fellows, Debashis Puhan, Janet S. S. Wong, Michael T. L. Casford and Paul B. Davies
Polymers 2022, 14(1), 192; https://doi.org/10.3390/polym14010192 - 4 Jan 2022
Cited by 3 | Viewed by 2525
Abstract
The blend of polyetheretherketone (PEEK) and polybenzimidazole (PBI) produces a high-performance blend (PPB) that is a potential replacement material in several industries due to its high temperature stability and desirable tribological properties. Understanding the nanoscale structure and interface of the two domains of [...] Read more.
The blend of polyetheretherketone (PEEK) and polybenzimidazole (PBI) produces a high-performance blend (PPB) that is a potential replacement material in several industries due to its high temperature stability and desirable tribological properties. Understanding the nanoscale structure and interface of the two domains of the blend is critical for elucidating the origin of these desirable properties. Whilst achieving the physical characterisation of the domain structures is relatively uncomplicated, the elucidation of structures at the interface presents a significant experimental challenge. In this work, we combine atomic force microscopy (AFM) with an IR laser (AFM-IR) and thermal cantilever probes (nanoTA) to gain insights into the chemical heterogeneity and extent of mixing within the blend structure for the first time. The AFM-IR and nanoTA measurements show that domains in the blend are compositionally different from those of the pure PEEK and PBI polymers, with significant variations observed in a transition region several microns wide in proximity to domain boundary. This strongly points to physical mixing of the two components on a molecular scale at the interface. The versatility intrinsic to the combined methodology employed in this work provides nano- and microscale chemical information that can be used to understand the link between properties of different length scales across a wide range of materials. Full article
(This article belongs to the Special Issue Polymer Blends and Injection Molding)
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10 pages, 2063 KiB  
Article
Reducing the Burn Marks on Injection-Molded Parts by External Gas-Assisted Injection Molding
by Jiquan Li, Wenyong Liu, Xinxin Xia, Hangchao Zhou, Liting Jing, Xiang Peng and Shaofei Jiang
Polymers 2021, 13(23), 4087; https://doi.org/10.3390/polym13234087 - 24 Nov 2021
Cited by 6 | Viewed by 3600
Abstract
A burn mark is a sort of serious surface defect on injection-molded parts. In some cases, it can be difficult to reduce the burn marks by traditional methods. In this study, external gas-assisted injection molding (EGAIM) was introduced to reduce the burn marks, [...] Read more.
A burn mark is a sort of serious surface defect on injection-molded parts. In some cases, it can be difficult to reduce the burn marks by traditional methods. In this study, external gas-assisted injection molding (EGAIM) was introduced to reduce the burn marks, as EGAIM has been reported to reduce the holding pressure. The parts with different severities of burn marks were produced by EGAIM and conventional injection molding (CIM) with the same molding parameters but different gas parameters. The burn marks were quantified by an image processing method and the quantitative method was introduced to discuss the influence of the gas parameters on burn marks. The results show that the burn marks can be eliminated by EGAIM without changing the structure of the part or the mold, and the severity of the burn marks changed from 4.98% with CIM to 0% with EGAIM. Additionally, the gas delay time is the most important gas parameter affecting the burn marks. Full article
(This article belongs to the Special Issue Polymer Blends and Injection Molding)
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