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Polymers
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Advances in Flame Retardant Polymer Materials
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Advances in Flame Retardant Polymer Materials

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 April 2023) | Viewed by 5787

Special Issue Editors

Dr. Xiaomin Zhao

E-Mail Website
Guest Editor
College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, China
Interests: structure-property relationship; high-performance composites; halogen-free flame retardant
Dr. Ye-Tang Pan

E-Mail Website
Guest Editor
National Engineering Technology Research Center of Flame Retardant Materials, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, China
Interests: nano-flame retardant synthesis; flame-retardant polymer nanocomposites; metal–organic framework-based flame retardants
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Over the last decade, numerous studies have focused on flame-retardant polymer and polymer composites both in the academic and industrial worlds. Halogen-free flame-retardant technology is attracting a large level of interest owing to the awareness of environmental and human health issues associated with its applications.

In this context, highly efficient, eco-friendly, smoke-suppressed, and low-toxic polymers are leading topics in the field of flame-retardant polymers. Reactive and macromolecular organophosphorus structures, the variety of nanoparticles (LDHs, MOFs, organic-modified clays, POSS, black phosphorus, etc.), bio-based compounds (phytic acid, starch, β-CD, lignin, DNA, alginate, etc.), carbon materials (expandable graphite, graphene, carbon nanotubes, fullerene, etc.), boric compounds, and organometallic complexes greatly enrich the flame-retardant family, as well as synergetic systems.

This Special Issue focuses on progress in the synthesis, functionalization, characterization, mechanism, and advanced technologies for halogen-free flame retardants.

Full papers, communications, and reviews are welcomed.

Dr. Xiaomin Zhao
Dr. Ye-Tang Pan
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

  • flame-retardant polymer
  • polymer composites
  • structure-property relationship

Published Papers (3 papers)

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Research

14 pages, 3528 KiB  
Article
How Do Phosphorus Compounds with Different Valence States Affect the Flame Retardancy of PET?
by Siheng Zhao, Bo Xu, Hao Shan, Qinglei Zhang and Xiangdong Wang
Polymers 2023, 15(8), 1917; https://doi.org/10.3390/polym15081917 - 17 Apr 2023
Cited by 5 | Viewed by 1201
Abstract
This work investigated the effect of different valence states of phosphorus-containing compounds on thermal decomposition and flame retardancy of polyethylene terephthalate (PET). Three polyphosphates—PBPP with +3-valence P, PBDP with +5-valence P and PBPDP with both +3/+5-valence P—were synthesized. The combustion behaviors of flame-retardant [...] Read more.
This work investigated the effect of different valence states of phosphorus-containing compounds on thermal decomposition and flame retardancy of polyethylene terephthalate (PET). Three polyphosphates—PBPP with +3-valence P, PBDP with +5-valence P and PBPDP with both +3/+5-valence P—were synthesized. The combustion behaviors of flame-retardant PET were studied and the structure–property relationships between the phosphorus-based structures with different valence states and flame-retardant properties were further explored. It was found that phosphorus valence states significantly affected the flame-retardant modes of action of polyphosphate in PET. For the phosphorus structures with +3-valence, more phosphorus-containing fragments were released in the gas phase, inhibiting polymer chain decomposition reactions; by contrast, those with +5-valence phosphorus retained more P in the condensed phase, promoting the formation of more P-rich char layers. It is worth noting that the polyphosphate containing both +3/+5-valence phosphorous tended to combine the advantage of phosphorus structures with two valence states and balance the flame-retardant effect in the gas phase and condensed phase. These results contribute to guiding the design of specified phosphorus-based structures of flame-retardant compounds in polymer materials. Full article
(This article belongs to the Special Issue Advances in Flame Retardant Polymer Materials)
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18 pages, 12035 KiB  
Article
Fabrication of Polypyrrole-Decorated Tungsten Tailing Particles for Reinforcing Flame Retardancy and Ageing Resistance of Intumescent Fire-Resistant Coatings
by Feiyue Wang, Hui Liu and Long Yan
Polymers 2022, 14(8), 1540; https://doi.org/10.3390/polym14081540 - 11 Apr 2022
Cited by 10 | Viewed by 1664
Abstract
Polypyrrole-decorated tungsten tailing particles (PPY-TTF) were prepared via the in situ polymerization of pyrrole in the presence of tungsten tailing particles (TTF), and then carefully characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and thermogravimetric analysis (TG) analyses. The effect [...] Read more.
Polypyrrole-decorated tungsten tailing particles (PPY-TTF) were prepared via the in situ polymerization of pyrrole in the presence of tungsten tailing particles (TTF), and then carefully characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and thermogravimetric analysis (TG) analyses. The effect of PPY-TTF on the flame retardancy, smoke suppression property and ageing resistance of intumescent fire-resistant coatings was investigated by a fire protection test, smoke density test and cone calorimeter test. The results show that PPY-TTF exerts excellent cooperative effect on enhancing the flame retardancy and smoke suppression properties of the intumescent fire-retardant coatings, which is ascribed to the formation of more cross-linking structures in the condense phase that enhance the compactness and thermal stability of intumescent char. The cooperative effect of PPY-TTF in the coatings depends on its content, and the coating containing 3 wt% PPY-TTF exhibits the best cooperative effect among the samples, showing a 10.7% reduction in mass loss and 35.4% reduction in flame-spread rating compared to that with 3% TTF. The accelerated ageing test shows that the presence of PPY-TTF greatly slows down the blistering and powdering phenomenon of the coatings, thus endowing the coating with the super durability of fire resistance and smoke suppression property. This work provides a new strategy for the resource utilization of tungsten tailing in the field of flame-retardant materials. Full article
(This article belongs to the Special Issue Advances in Flame Retardant Polymer Materials)
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13 pages, 17989 KiB  
Article
Green Flame-Retardant Composites Based on PP/TiO2/Lignin Obtained by Melt-Mixing Extrusion
by Marlene Andrade-Guel, Christian Cabello-Alvarado, Carlos Alberto Avila-Orta, Marissa Pérez-Alvarez, Gregorio Cadenas-Pliego, Pamela Yahaira Reyes-Rodríguez and Leopoldo Rios-González
Polymers 2022, 14(7), 1300; https://doi.org/10.3390/polym14071300 - 23 Mar 2022
Cited by 12 | Viewed by 2360
Abstract
Nowadays, highly flammable and harmful plastic materials are used in many daily applications. To prevent burning of materials, other harmful molecules or materials that are not environmentally friendly are added to plastics. To overcome this environmental issue, new materials have been investigated. Lignin, [...] Read more.
Nowadays, highly flammable and harmful plastic materials are used in many daily applications. To prevent burning of materials, other harmful molecules or materials that are not environmentally friendly are added to plastics. To overcome this environmental issue, new materials have been investigated. Lignin, an industrial by-product, is an abundant biopolymer that can be used in fire safety plastics; it is considered a renewable and readily available resource. In this work, PP–TiO2/lignin composites were obtained with TiO2/lignin mixtures through the melt extrusion process, with different weight percentages of nanoparticles (10, 20, 25, and 30 wt.%). The PP–TiO2/lignin composites were characterized by XRD, FTIR, TGA, and SEM. Furthermore, cone calorimetry tests and the mechanical properties were evaluated. Cone calorimetry tests revealed that the introduction of 25 wt.% TiO2–lignin to the PP matrix reduced the peak of heat release rate (PHRR) and total heat release (THR) by 34.37% and 35.45%, respectively. The flame retardancy index (FRI) values of the composites were greater than 1.0 and were classified as good; the highest value of 1.93 was obtained in the PP-30 sample. The tensile tests demonstrated that the flexural modulus of the composites increased gradually with increasing lignin and TiO2 content, and the flexural strength decreased slightly. The use of lignin in PP composites can be an excellent alternative to synthesize new materials with improved flame-retardant properties and which is friendly to the environment. Full article
(This article belongs to the Special Issue Advances in Flame Retardant Polymer Materials)
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