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Polymers
Special Issues
Polymer Foam and Its Engineering Application
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Polymer Foam and Its Engineering Application

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

Deadline for manuscript submissions: closed (25 February 2024) | Viewed by 4545

Special Issue Editors

Dr. Qingguo Wang

E-Mail Website
Guest Editor
College of Safety Science and Engineering, Nanjing Tech University, Nanjing 211816, China
Interests: foam; surfactant; gas-liquid interface; disaster prevention and control; safety
Dr. Yan Tang

E-Mail Website
Guest Editor
College of Safety Engineering, Changzhou University, Changzhou 213164, China
Interests: fire prevention; dust control; chemical engineering safety; urban public safety; emergency management
Dr. Xin Zhang

E-Mail Website
Guest Editor
College of Safety Science and Engineering, Nanjing Tech University, Nanjing 211816, China
Interests: molecular dynamics; quantum chemistry; reaction mechanism; nanofludics; membrane separation

Special Issue Information

Dear Colleagues,

Water-based foam adopts water as the dispersion medium and has high fluidity and specific surface area. It has been widely applied in the fields of dust suppression, fire extinguishing, ore flotation, multiple oil recovery, wastewater treatment, enzyme protein purification and separation, etc. Its high utility with regard to energy, environment and nano-material synthesis has attracted global attention. To satisfy the increasing demand for technological innovations in environmentally friendly foam, the intelligence of foam systems and the theoretical understanding of multiphase dispersion systems, this Special Issue of Polymers invites contributions addressing aspects of the formation and stability mechanism of foam, the research and development of environmental protection foam, and the new application of foam in disaster prevention and control. The above list is only indicative and by no means exhaustive; any original work or review article on water-based foams is welcome.

Dr. Qingguo Wang
Dr. Yan Tang
Dr. Xin Zhang 
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

  • foam
  • surfactant
  • polymers
  • gas
  • liquid interface
  • liquid film
  • disaster prevention and control
  • safety

Published Papers (4 papers)

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Research

23 pages, 3679 KiB  
Article
Effect of Operational Variables on Supercritical Foaming of Caffeic Acid-Loaded Poly(lactic acid)/Poly(butylene adipate-co-terephthalate) Blends for the Development of Sustainable Materials
by Patricia Rivera, Alejandra Torres, Julio Romero, Álvaro Alarcón, Sara Martínez, Marina P. Arrieta, Francisco Rodríguez-Mercado and María José Galotto
Polymers 2024, 16(7), 948; https://doi.org/10.3390/polym16070948 - 30 Mar 2024
Viewed by 905
Abstract
Expanded polystyrene will account for 5.3% of total global plastic production in 2021 and is widely used for food packaging due to its excellent moisture resistance and thermal insulation. However, some of these packages are often used only once before being discarded, generating [...] Read more.
Expanded polystyrene will account for 5.3% of total global plastic production in 2021 and is widely used for food packaging due to its excellent moisture resistance and thermal insulation. However, some of these packages are often used only once before being discarded, generating large amounts of environmentally harmful plastic waste. A very attractive alternative to the conventional methods used for polymer processing is the use of supercritical carbon dioxide (scCO2) since it has mass-transfer properties adapted to the foam morphology, generating different path lengths for the diffusion of active compounds within its structure and can dissolve a wide range of organic molecules under supercritical conditions. The objective of this research was to evaluate the effect of operational variables on the process of caffeic acid (CA) impregnation and subsequent foaming of polylactic acid (PLA) as well as two PLA/poly(butylene-co-terephthalate-adipate) (PBAT) blends using scCO2. The results showed an increase in the degree of crystallinity of the CA-impregnated samples due to the nucleation effect of the active compound. On the other hand, SEM micrographs of both films and foams showed significant differences due to the presence of PBAT and its low miscibility with PLA. Finally, the results obtained in this work contribute to the knowledge of the important parameters to consider for the implementation of the impregnation and foaming process of PLA and PLA/PBAT blends with potential use in food packaging. Full article
(This article belongs to the Special Issue Polymer Foam and Its Engineering Application)
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25 pages, 11783 KiB  
Article
Numerical Analysis on the Dynamic Response of PVC Foam/Polyurea Composite Sandwich Panels under the Close Air Blast Loading
by Kaida Dai, Tao Jiang, Meng Zhao, Yuxin Xu, Xiaosong Zhao and Jiang Bian
Polymers 2024, 16(6), 810; https://doi.org/10.3390/polym16060810 - 14 Mar 2024
Viewed by 685
Abstract
This paper explores a novel structure aimed at enhancing its blast resistance performance by adding a layer of polyurea coating to the steel-PVC foam-steel sandwich panel. The response of 13 different arrangements of sandwich panels under explosive loading was studied using numerical simulation. [...] Read more.
This paper explores a novel structure aimed at enhancing its blast resistance performance by adding a layer of polyurea coating to the steel-PVC foam-steel sandwich panel. The response of 13 different arrangements of sandwich panels under explosive loading was studied using numerical simulation. The response process can be divided into three deformation stages: (1) Fluid-structure interaction; (2) Compression of the sandwich panel; (3) Dynamic structural response. The dynamic responses of the various sandwich panels to close-range air blast loading were analyzed based on the deformation characteristics, deflection, effective plastic strain, energy absorption, and pressure of the shock wave. The study draws the following conclusions: Reasonably adding a layer of polyurea to the traditional PVC foam sandwich panel can enhance its resistance to shock wave absorption, with a maximum increase of 29.8%; the optimal arrangement for explosion resistance is steel plate-PVC foam-polyurea-steel plate when the polyurea is coated on the back; and the best quality ratio between polyurea and PVC foam is 1:7 when the polyurea is coated on the front. Full article
(This article belongs to the Special Issue Polymer Foam and Its Engineering Application)
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22 pages, 6385 KiB  
Article
Flexible Polyurethane Foams from Bio-Based Polyols: Prepolymer Synthesis and Characterization
by Simona Losio, Angelica Cifarelli, Adriano Vignali, Simona Tomaselli and Fabio Bertini
Polymers 2023, 15(22), 4423; https://doi.org/10.3390/polym15224423 - 16 Nov 2023
Cited by 1 | Viewed by 1551
Abstract
Bio-polyols (BPOs), characterized by a hydroxyl number up to around 90 mg KOH/g, narrow polydispersity index and relatively low molecular mass up to 2000 g/mol, were synthetized from partially and completely epoxidized soybean and linseed oils and caprylic acid or 3-phenyl butyric acid. [...] Read more.
Bio-polyols (BPOs), characterized by a hydroxyl number up to around 90 mg KOH/g, narrow polydispersity index and relatively low molecular mass up to 2000 g/mol, were synthetized from partially and completely epoxidized soybean and linseed oils and caprylic acid or 3-phenyl butyric acid. These BPOs were used in the presence of toluene diisocyanate to produce polyurethane (PU) foams by using a quasi-prepolymer method involving a two-step reaction. A detailed structural investigation of the prepolymers from toluene diisocyanate and both BPOs and polypropylene glycol was conducted by SEC and solution NMR. The apparent density of the foams was in the range of 40–90 kg/m3, with higher values for foams from the aromatic acid. All the foams showed an open-cell structure with uniform and regular shape and uniform size. The specific Young’s moduli and compression deflection values suggest superior mechanical properties than the reference foams. The novel synthesized polyurethanes are excellent candidates to partially replace petroleum-based materials. Full article
(This article belongs to the Special Issue Polymer Foam and Its Engineering Application)
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13 pages, 5575 KiB  
Article
Effect of Janus Nanosheets in Polypropylene on Rheological Properties and Autoclave Foam Performance
by Yaohui Xu, Peng Guo, Hengyuan Zhang, Minqiao Ren and Mingfu Lyu
Polymers 2023, 15(16), 3433; https://doi.org/10.3390/polym15163433 - 17 Aug 2023
Viewed by 752
Abstract
Our experiment revealed that the addition of Janus nanosheets to polypropylene (PP) has a significant impact on the viscoelasticity of the composite system. Specifically, when 0.10 wt% of Janus nanosheets were added, the complex viscosity of the composite system increased. However, when we [...] Read more.
Our experiment revealed that the addition of Janus nanosheets to polypropylene (PP) has a significant impact on the viscoelasticity of the composite system. Specifically, when 0.10 wt% of Janus nanosheets were added, the complex viscosity of the composite system increased. However, when we added less than 0.05 wt% of Janus nanosheets, there was a reduction in complex viscosity, which is known as the non-Einstein phenomenon. The Cole–Cole plot showed that the nanosheet network structure did not have a significant effect on the viscosity of the composite system. Additionally, we used carbon dioxide as a foaming agent to autoclave foaming using modified PP from Janus nanosheets, and the results demonstrated that increasing the number of Janus nanosheets decreased the apparent density and strengthened the cell structure of foaming beads, resulting in improved closed porosity. Full article
(This article belongs to the Special Issue Polymer Foam and Its Engineering Application)
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