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Polymers
Special Issues
Innovative Injection Molding and Polymer Processing Technology
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Innovative Injection Molding and Polymer Processing Technology

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 October 2023) | Viewed by 6875

Special Issue Editors

Dr. Huaguang Yang

E-Mail Website
Guest Editor
National Industrial Innovation Center of Polymer Materials, Guangzhou 510663, China
Interests: injection molding; polymer processing; composites and blends; polymer foams
Prof. Bo Wu

E-Mail Website
Guest Editor
National Industrial Innovation Center of Polymer Materials, Guangzhou 510663, China
Interests: polymer processing; material characterization; low carbon and sustainability
Prof. Dr. Pengcheng Xie

E-Mail Website
Guest Editor
College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Interests: injection molding and innovative plastics manufacturing processes; polymer processing principle and equipment; microcellular injection molding
Prof. Dr. Weimin Yang

E-Mail Website
Guest Editor
College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Interests: plastics precision molding and automotive plastics manufacturing; tire optimization design and advanced manufacturing; melt-electrospinning and microfibre manufacturing; energy-saving and environmental application of polymer and green manufacturing

Special Issue Information

Dear Colleagues,

Injection molding is arguably one of the most important polymer processing methods and ranks number 1 in terms of number of machines, employment, and total product value that exceeds USD 210 billion per year, due to its advantages of low cost, high efficiency, and capacity for producing complex products. Many efforts have been made recently to ensure that the injection molding and polymer processing meet the requirement of low carbon and sustainable manufacturing, with some significant progress achieved. 

This Special Issue aims to present the latest research and developments on innovative injection molding and polymer processing technology. Original, high-level research or review papers that cover a broad range of topics, including but not limited to innovative injection molding technology, artificial intelligence techniques for injection molding, innovative polymer processing technology, 3D printing and 3D copying, low carbon and sustainability, advanced injection machine, mold design, CAE simulation, composites and blends, and polymer foams, are highly welcome.   

We invite researchers from all over the world to contribute to this Special Issue by submitting their papers.

Dr. Huaguang Yang
Prof. Bo Wu
Prof. Dr. Pengcheng Xie
Prof. Dr. Weimin Yang
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

  • innovative injection molding technology
  • artificial intelligence techniques for injection molding
  • innovative polymer processing technology
  • 3D printing and 3D copying
  • low carbon and sustainability
  • advanced injection machine
  • mold design
  • CAE simulation
  • composites and blends
  • polymer foams

Published Papers (4 papers)

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Research

15 pages, 2159 KiB  
Article
Formulation and Performance of NBR/CR-Based High-Damping Rubber Composites for Soundproof Using Orthogonal Test
by Xiankui Zeng, Jinmei Zhu, Gaowei Li, Qing Miao, Mohini Sain and Ranran Jian
Polymers 2023, 15(9), 2208; https://doi.org/10.3390/polym15092208 - 06 May 2023
Viewed by 1758
Abstract
Multiple functional-material-filled nitrile butadiene rubber/chloroprene rubber (NBR/CR) acoustic composites were extensively studied and prepared. According to the orthogonal test table L25 (56), 25 groups of samples were prepared by using a low-temperature one-time rubber mixing process. With tensile strength, average transmission [...] Read more.
Multiple functional-material-filled nitrile butadiene rubber/chloroprene rubber (NBR/CR) acoustic composites were extensively studied and prepared. According to the orthogonal test table L25 (56), 25 groups of samples were prepared by using a low-temperature one-time rubber mixing process. With tensile strength, average transmission loss, and damping peak as indexes, the influence degree of different factors and levels on the properties of acoustic composites was quantitatively discussed and analyzed. The matrix weight analysis was employed to optimize the material formula of rubber composites, and the corresponding influence weight was given. Results showed that the acoustic composite with blending ratio of 70/30 for NBR/CR matrix had preferable mechanical and acoustic properties; adding mica powder (MP) and montmorillonite (MMT) in matrix contributed to improve all above three indexes owing to their specific lamellar structures; hollow glass beads (HGB) had a positive influence on improving acoustic property due to its hollow microcavities, however, it had a negative impact on damping property because of the smooth spherical surfaces. Accordingly, the optimal formulation was found to be NBR/CR blending ratio of 70/30, MP of 10 phr (per hundred rubber), HGB of 4 phr, and MMT of 10 phr. Full article
(This article belongs to the Special Issue Innovative Injection Molding and Polymer Processing Technology)
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12 pages, 3948 KiB  
Article
Effects of Processing Method and Parameters on the Wall Thickness of Gas-Projectile-Assisted Injection Molding Pipes
by Tangqing Kuang, Jiamin Wang, Hesheng Liu and Zhihuan Yuan
Polymers 2023, 15(9), 1985; https://doi.org/10.3390/polym15091985 - 22 Apr 2023
Cited by 2 | Viewed by 1667
Abstract
Gas-Projectile-Assisted Injection Molding (G-PAIM) is a new injection molding process derived from the Gas-Assisted Injection Molding (GAIM) process by introducing a projectile to it. In this study, the short-shot method and the overflow method of both the G-PAIM and GAIM processes were experimentally [...] Read more.
Gas-Projectile-Assisted Injection Molding (G-PAIM) is a new injection molding process derived from the Gas-Assisted Injection Molding (GAIM) process by introducing a projectile to it. In this study, the short-shot method and the overflow method of both the G-PAIM and GAIM processes were experimentally compared and investigated in terms of the wall thickness of the pipes and its uniformity. The results showed that the wall thickness of the G-PAIM molded pipe was thinner and more uniform than that of the GAIM molded pipe, and the wall thickness of the pipe molded by the Gas-Projectile-Assisted Injection Molding Overflow (G-PAIM-O) process was the most uniform. For the G-PAIM-O process, the influence of processing parameters, including melt temperature, gas injection delay time, gas injection pressure, melt injection pressure and mold temperature, on the wall thickness and uniformity of the G-PAIM-O pipes were studied via the single-factor experimental method. It was found that the effects of gas injection delay time and gas injection pressure on the wall thickness of the G-PAIM-O pipes were relatively significant. The wall thickness of the pipes increased with the increase in gas injection delay time and decreased with the increase in gas injection pressure. The melt temperature, melt injection pressure and mold temperature had little effect on the wall thickness of the G-PAIM-O pipes. In general, the wall thickness uniformity of the G-PAIM-O pipes was slightly affected by these processing parameters. Full article
(This article belongs to the Special Issue Innovative Injection Molding and Polymer Processing Technology)
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14 pages, 3969 KiB  
Article
Fabricating Well-Dispersed Poly(Vinylidene Fluoride)/Expanded Graphite Composites with High Thermal Conductivity by Melt Mixing with Maleic Anhydride Directly
by Jun Tong, Huannan Zheng, Jinwei Fan, Wei Li, Zhifeng Wang, Haichen Zhang, Yi Dai, Haichu Chen and Ziming Zhu
Polymers 2023, 15(7), 1747; https://doi.org/10.3390/polym15071747 - 31 Mar 2023
Cited by 3 | Viewed by 1276
Abstract
Maleic anhydride (MA) is introduced to fabricate poly(vinylidene fluoride)/expanded graphite (PVDF/EG) composites via one-step melt mixing. SEM micrographs and WAXD results have demonstrated that the addition of MA helps to exfoliate and disperse the EG well in the PVDF matrix by promoting the [...] Read more.
Maleic anhydride (MA) is introduced to fabricate poly(vinylidene fluoride)/expanded graphite (PVDF/EG) composites via one-step melt mixing. SEM micrographs and WAXD results have demonstrated that the addition of MA helps to exfoliate and disperse the EG well in the PVDF matrix by promoting the mobility of PVDF molecular chains and enhancing the interfacial adhesion between the EG layers and the PVDF. Thus, much higher thermal conductivities are obtained for the PVDF/MA/EG composites compared to the PVDF/EG composites that are lacking MA. For instance, The PVDF/MA/EG composite prepared with a mass ratio of 93:14:7 exhibits a high thermal conductivity of up to 0.73 W/mK. It is 32.7% higher than the thermal conductivity of the PVDF/EG composite that is prepared with a mass ratio of 93:7. Moreover, the introduction of MA leads to an increased melting peak temperature and crystallinity due to an increased nucleation site provided by the uniformly dispersed EG in the PVDF matrix. This study provides an efficient preparation method for PVDF/EG composites with a high thermal conductivity. Full article
(This article belongs to the Special Issue Innovative Injection Molding and Polymer Processing Technology)
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14 pages, 8594 KiB  
Article
Refined Spherulites of PP Induced by Supercritical N2 and Graphite Nanosheet and Foaming Performance
by Ya Liu, Yanjin Guan, Jiqiang Zhai, Lei Zhang, Fengjiao Chen and Jun Lin
Polymers 2023, 15(5), 1204; https://doi.org/10.3390/polym15051204 - 27 Feb 2023
Viewed by 1115
Abstract
The isothermal crystallization properties of polypropylene/graphite nanosheet (PP/GN) nanocomposites under supercritical N2 were systematically studied by a self-made in situ high-pressure microscope system. The results showed that the GN caused irregular lamellar crystals to form within the spherulites due to its effect [...] Read more.
The isothermal crystallization properties of polypropylene/graphite nanosheet (PP/GN) nanocomposites under supercritical N2 were systematically studied by a self-made in situ high-pressure microscope system. The results showed that the GN caused irregular lamellar crystals to form within the spherulites due to its effect on heterogeneous nucleation. It was found that the grain growth rate exhibits a decreasing and then increasing trend with the enhancement of N2 pressure. Using the secondary nucleation model, the secondary nucleation rate for spherulites of PP/GN nanocomposites was investigated from an energy perspective. The increase in free energy introduced by the desorbed N2 is the essential reason for the increase in the secondary nucleation rate. The results from the secondary nucleation model were consistent with those acquired through isothermal crystallization experiments, suggesting that the model can accurately predict the grain growth rate of PP/GN nanocomposites under supercritical N2 conditions. Furthermore, these nanocomposites demonstrated good foam behavior under supercritical N2. Full article
(This article belongs to the Special Issue Innovative Injection Molding and Polymer Processing Technology)
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