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Polymers
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Recent Research Progress on the Structure and Application of Polymeric...
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Recent Research Progress on the Structure and Application of Polymeric Foam

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

Deadline for manuscript submissions: closed (25 July 2023) | Viewed by 4461

Special Issue Editor

Dr. Yonghui Wang

E-Mail Website
Guest Editor
School of Civil Engineering, Harbin Institute of Technology, Harbin, China
Interests: steel-concrete composite structures; impact and blast protections; steel structures; foam filled energy absorption structures; numerical simulation
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

There has been an increasing trend in the use of polymeric foam as a filler for thin-walled energy absorption structures because of its high specific energy absorption, low cost and ease of manufacture. Rapid developments in the field of polymeric foam filled energy absorption structures have boosted their applications in aerospace, military, automotive engineering, civil engineering and other industries. Hence, the development of new polymeric foam filled energy absorption structures is a hot topic in this field, especially for understanding their behaviors under extreme loading scenarios such as from impacts and blasts.

This Special Issue considers recent research on novel polymeric foam filled energy absorption structures. Of special interest are the research topics focused on developing new types of polymeric foam filled energy absorption structures with high specific energy absorption as well as those related to new experimental techniques, numerical simulation methods and theoretical advances for the polymeric foam filled energy absorption structures.

It is our pleasure to invite you to submit a manuscript to this Special Issue.

Dr. Yonghui Wang
Guest Editor

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.

Published Papers (3 papers)

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Research

16 pages, 3394 KiB  
Article
Studying the Properties of Chromium-Contaminated Soil Solidified by Polyurethane
by Qiang Ma, Junjie Chen, Wentao Li and Nianze Wu
Polymers 2023, 15(9), 2118; https://doi.org/10.3390/polym15092118 - 28 Apr 2023
Cited by 3 | Viewed by 1067
Abstract
The solidification of chromium-contaminated soil using polyurethane (PU) was systematically investigated. The unconfined compression test was conducted to investigate the effects of the curing time, PU dosage and the content of chromium ions on the unconfined compressive strength (UCS) of chromium-contaminated soil. The [...] Read more.
The solidification of chromium-contaminated soil using polyurethane (PU) was systematically investigated. The unconfined compression test was conducted to investigate the effects of the curing time, PU dosage and the content of chromium ions on the unconfined compressive strength (UCS) of chromium-contaminated soil. The effect of the PU dosage on the pore structure was investigated using nuclear magnetic resonance (NMR) and scanning electron microscopy (SEM), and the mechanism of strength change was revealed by combining the strength law with the pore structure development law. In addition, the ability of the PU to solidify the chromium-contaminated soil was studied by the toxicity characteristic leaching procedure (TCLP). According to the above test results, the UCS and the ability of the PU to solidify the chromium ions increased with the increase in curing time. The NMR tests showed that with the increase in PU dosage, the porosity decreased and the soil became more compact, hence increasing the strength. When the chromium ion content was 2000 mg/kg and the PU dosage was 8%, the strength of the sample was 0.37 MPa after curing for 24 h, which met the requirement of 0.35 MPa set by the U.S. Environmental Protection Agency. Consequently, PU is a solidification agent with high-early strength. Full article
(This article belongs to the Special Issue Recent Research Progress on the Structure and Application of Polymeric Foam)
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14 pages, 3617 KiB  
Article
The Effect of α-Olefin–Maleic Anhydride Copolymer on the Rheological and Crystalline Properties and Microcellular Foaming Behavior of Polyamide 6
by Shengnan Li, Tuanhui Jiang, Xiangbu Zeng, Nenggui Zhu, Chao Shen, Wei Gong, Chun Zhang and Li He
Polymers 2023, 15(9), 2056; https://doi.org/10.3390/polym15092056 - 26 Apr 2023
Cited by 2 | Viewed by 1189
Abstract
The α-olefin–maleic anhydride copolymer DIA as a chain extender was used to modify polyamide 6 (PA6) during melt blending. The ability to modulate this modification for PA6 has been shown to be dependent on the effects of its content on the molecular weight [...] Read more.
The α-olefin–maleic anhydride copolymer DIA as a chain extender was used to modify polyamide 6 (PA6) during melt blending. The ability to modulate this modification for PA6 has been shown to be dependent on the effects of its content on the molecular weight distribution, rheological properties, crystalline properties, mechanical properties, and foaming behavior of foam samples. By increasing the DIA content, the viscoelasticity, water contact angle, and elongation at break improved as a result of a significant decrease in water absorption and melt flow rate. Compared with raw PA6, the modified PA6 presented a relatively wider molecular weight distribution. However, the crystallinity of modified PA6 samples decreased, the double melting peaks became one peak, and the α crystallites at 20.3° gradually disappeared with increasing DIA content. The morphologies of composite foams with different contents were analyzed using scanning electron microscopy. It was found that the cell size of different PA6 samples decreased from 160 μm to 83 μm and the cell density increased from 1.1 × 105 cells/cm3 to 5.9 × 105 cells/cm3 when the content of DIA increased from 0 wt% to 5 wt%. Meanwhile, the cell morphology obviously improved and the cell size distribution became narrow. Thus, a preparation technology based on foaming materials with excellent performance, such as better bubble quality and low water absorption, was developed for further research and application. Full article
(This article belongs to the Special Issue Recent Research Progress on the Structure and Application of Polymeric Foam)
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12 pages, 6076 KiB  
Article
TPV Foaming by CO2 Extrusion: Processing and Modelling
by Benoit Rainglet, Paul Besognet, Cyril Benoit, Karim Delage, Véronique Bounor-Legaré, Charlène Forest, Philippe Cassagnau and Yvan Chalamet
Polymers 2022, 14(21), 4513; https://doi.org/10.3390/polym14214513 - 25 Oct 2022
Cited by 4 | Viewed by 1775
Abstract
This work focuses on the extrusion foaming under CO2 of commercial TPV and how the process influences the final morphology of the foam. Moreover, numerical modelling of the cell growth of the extrusion foaming is developed. The results show how a precise [...] Read more.
This work focuses on the extrusion foaming under CO2 of commercial TPV and how the process influences the final morphology of the foam. Moreover, numerical modelling of the cell growth of the extrusion foaming is developed. The results show how a precise control on the saturation pressure, die geometry, temperature and nucleation can provide a homogeneous foam having a low density (<500 kg/m3). This work demonstrates that an optimum of CO2 content must be determined to control the coalescence phenomenon that appears for high levels of CO2. This is explained by longer residence times in the die (time of growth under confinement) and an early nucleation (expansion on the die destabilizes the polymer flow). Finally, this work proposes a model to predict the influence of CO2 on the flow (plasticizing effect) and a global model to simulate the extrusion process and foaming inside and outside the die. For well-chosen nucleation parameters, the model predicts the final mean radius of the cell foam as well as final foam density. Full article
(This article belongs to the Special Issue Recent Research Progress on the Structure and Application of Polymeric Foam)
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