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Polymers
Special Issues
Status and Progress of Soluble Polymers II
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Status and Progress of Soluble Polymers II

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

Deadline for manuscript submissions: 15 October 2024 | Viewed by 3755

Special Issue Editors

Dr. Gonzalo R. Quezada

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Guest Editor
Departamento de Ingeniería Química, Facultad de Ingeniería, Universidad de Concepción, Victor Lamas, Concepción 4030000, Chile
Interests: molecular dynamics; polymers; polyelectrolytes; adsorption; clays
Special Issues, Collections and Topics in MDPI journals
Dr. Ricardo Ivan Jeldres

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Guest Editor
Departamento de Ingeniería Química y Procesos de Minerales, Facultad de Ingeniería, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1240000, Chile
Interests: flocculation; rheology; froth flotation; colloids
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Polymers play an important role in various applied areas in mining processing, the food industry, paper, and others. Its great importance lies mainly in its linear structure and the ability to modify its structure in the face of different operational conditions. Such characteristics allow polymers to be added at low doses and thus significantly change the properties of complex systems. This is due to their interaction with the medium or, in other words, their solubility. Therefore, it is necessary to study the chemical and electronic nature of polymers. First, the functional groups that constitute it can improve the flexibility or rigidity of the main chain. If these functional groups also have an explicit electrical charge, they can be polymers that respond to pH or salt. Familiarity with the structure and its behavior in the environment helps to predict its effects at the macroscopic level and understand the phenomena that occur in real processes (on an industrial scale). For example, in flocculation processes, it is relevant that polymers cover a large area and can also adhere to charged particles. In wastewater treatment, it is necessary to generate a good electrostatic attraction between the polymers and the dispersed particles in the medium.

Due to these aspects, it is then relevant to know the characteristics that ultimately influence the macroscopic property that is applicable to the process of interest from an atomic point of view. This Special Issue aims to explore polymers on a molecular scale, specifically their design and optimization.

Dr. Gonzalo R. Quezada
Dr. Ricardo Ivan Jeldres
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

  • linear and branched structure
  • polysaccharide and organic polymers
  • simulation (molecular, ab initio, coarse grained)
  • pH-responsive polymers
  • industrial applications

Published Papers (3 papers)

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Research

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21 pages, 5827 KiB  
Article
Nafion: A Flexible Template for Selective Structuring
by Nikolai F. Bunkin, Polina N. Bolotskova, Sergey V. Gudkov, Minh T. Khuong, Valeriy A. Kozlov, Svetlana L. Timchenko, Valeriy V. Voronov and Yulia V. Novakovskaya
Polymers 2024, 16(6), 744; https://doi.org/10.3390/polym16060744 - 08 Mar 2024
Viewed by 537
Abstract
The peculiarities of crystal growth on a Nafion polymeric substrate from supersaturated aqueous solutions of initial substances were studied. The solutions were prepared based on deionized natural water and deuterium-depleted water. As was found earlier, in natural water (deuterium content 157 ± 1 [...] Read more.
The peculiarities of crystal growth on a Nafion polymeric substrate from supersaturated aqueous solutions of initial substances were studied. The solutions were prepared based on deionized natural water and deuterium-depleted water. As was found earlier, in natural water (deuterium content 157 ± 1 ppm) polymer fibers are capable of unwinding towards the bulk of the liquid, while in deuterium-depleted water (deuterium content ≤ 3 ppm) there is no such effect. Since the distance between the unwound fibers falls in a nanometer range (which is close to the size of the unit cell of the crystal lattice), and these fibers are directed normally to the polymeric substrate, the unwinding can affect crystal growth on the polymer substrate. As was obtained in experiments with X-ray diffractometry, the unwound polymer fibers predetermine syngony of crystals, for which the unit cell is either a rectangular parallelepiped (monoclinic system) or an oblique parallelepiped (triclinic system). A quantitative theoretical model that describes the local interaction of the polymer substrate with the crystalline complexes is presented. Within this model, the polymer substrate can be considered as a flexible matrix for growing crystals. Full article
(This article belongs to the Special Issue Status and Progress of Soluble Polymers II)
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16 pages, 6073 KiB  
Article
Facile Synthesis of Polymer-Reinforced Silica Aerogel Microspheres as Robust, Hydrophobic and Recyclable Sorbents for Oil Removal from Water
by Zhiyang Zhao, Jian Ren, Wei Liu, Wenqian Yan, Kunmeng Zhu, Yong Kong, Xing Jiang and Xiaodong Shen
Polymers 2023, 15(17), 3526; https://doi.org/10.3390/polym15173526 - 24 Aug 2023
Cited by 2 | Viewed by 923
Abstract
With the rapid development of industry and the acceleration of urbanization, oil pollution has caused serious damage to water, and its treatment has always been a research hotspot. Compared with traditional adsorption materials, aerogel has the advantages of light weight, large adsorption capacity [...] Read more.
With the rapid development of industry and the acceleration of urbanization, oil pollution has caused serious damage to water, and its treatment has always been a research hotspot. Compared with traditional adsorption materials, aerogel has the advantages of light weight, large adsorption capacity and high selective adsorption, features that render it ideal as a high-performance sorbent for water treatment. The objective of this research was to develop novel hydrophobic polymer-reinforced silica aerogel microspheres (RSAMs) with water glass as the precursor, aminopropyltriethoxysilane as the modifier, and styrene as the crosslinker for oil removal from water. The effects of drying method and polymerization time on the structure and oil adsorption capacity were investigated. The drying method influenced the microstructure and pore structure in a noteworthy manner, and it also significantly depended on the polymerization time. More crosslinking time led to more volume shrinkage, thus resulting in a larger apparent density, lower pore volume, narrower pore size distribution and more compact network. Notably, the hydrophobicity increased with the increase in crosslinking time. After polymerization for 24 h, the RSAMs possessed the highest water contact angle of 126°. Owing to their excellent hydrophobicity, the RSAMs via supercritical CO2 drying exhibited significant oil and organic liquid adsorption capabilities ranging from 6.3 to 18.6 g/g, higher than their state-of-the-art counterparts. Moreover, their robust mechanical properties ensured excellent reusability and recyclability, allowing for multiple adsorption–desorption cycles without significant degradation in performance. The novel sorbent preparation method is facile and inspiring, and the resulting RSAMs are exceptional in capacity, efficiency, stability and regenerability. Full article
(This article belongs to the Special Issue Status and Progress of Soluble Polymers II)
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Review

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15 pages, 1821 KiB  
Review
Chemistry of Dimer Acid Production from Fatty Acids and the Structure–Property Relationships of Polyamides Made from These Dimer Acids
by Charles R. Frihart
Polymers 2023, 15(16), 3345; https://doi.org/10.3390/polym15163345 - 09 Aug 2023
Cited by 1 | Viewed by 1851
Abstract
While there is abundant literature on using a wide range of biomaterials to make polymers for various adhesive applications, most researchers have generally overlooked developing new adhesives from commercially available bio-based dimerized fatty acids. Some of the literature on the chemistry taking place [...] Read more.
While there is abundant literature on using a wide range of biomaterials to make polymers for various adhesive applications, most researchers have generally overlooked developing new adhesives from commercially available bio-based dimerized fatty acids. Some of the literature on the chemistry taking place during the clay-catalyzed dimerization of unsaturated fatty acids is generally misleading in that the mechanisms are not consistent with the structures of these dimers and a by-product isostearic acid. A selective acid-catalyzed interlayer model is much more logical than the widely accepted model of clay-catalyzed Diels–Alder reactions. The resulting dimers have a variety of linkages limiting large crystal formation either as oligomeric amides or polyamides. These highly aliphatic fatty acid dimers are used to make a wide range of hot melt polyamide adhesives. The specific structures and amounts of the diacids and diamines and their relative ratios have a big effect on the bio-based polyamide mechanical properties, but analysis of the structure–property relationships has seldom been attempted, since the data are mainly in the patent literature. The diacids derived from plant oils are valuable for making polyamides because of their very high bio-based content and highly tunable properties. Full article
(This article belongs to the Special Issue Status and Progress of Soluble Polymers II)
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