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Polymers
Special Issues
State-of-the-Art Polymer Science and Technology in Chile (2022,2023)
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State-of-the-Art Polymer Science and Technology in Chile (2022,2023)

A special issue of Polymers (ISSN 2073-4360).

Deadline for manuscript submissions: closed (30 April 2023) | Viewed by 5902

Special Issue Editors

Prof. Dr. Bernabé L. Rivas Quiroz

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Guest Editor
Departamento de Polímeros, Facultad de Ciencias Químicas, Universidad de Concepción, Concepción 4030000, Chile
Interests: materials science; membranes; nanocomposites; functional polymers; biopolymers; removal of inorganic and organic pollutants
Special Issues, Collections and Topics in MDPI journals
Dr. Julio Sánchez Poblete

E-Mail Website1 Website2
Guest Editor
Departamento de Ciencias del Ambiente, Facultad de Química y Biología, Universidad de Santiago de Chile (USACH), Santiago 9170022, Chile
Interests: adsorption; functional polymers; membranes
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues, 

Polymer and macromolecular science and technology is one of the most important and representative research fields for the scientific community in Chile. This area includes both fundamental and applied studies of polymers and macromolecules, including polymer innovations and research applications in science, technology, engineering, and medicine.

Several research groups coming from different institutions often collaborate in the design and characterization of the polymer materials, and the processing technology to obtain innovative products with innovative properties.

In this Special Issue, we are very pleased to include research of high scientific value made by the best specialists from research centers, universities, and company representatives of the research field.

This Special Issue aims at collecting an overview of polymer, macromolecular sciences, and technology in Chile. Research topics include but are not limited to: polymer composites and nanocomposites; biopolymers; polymers with environmental applications; advanced characterization of polymers; innovative polymer processes; modeling of polymer and processing; among others.

The only limitation is that the main part of the study has to have been carried out in Chile or by Chilean researchers with international collaborators.

We do hope that this Special Issue can represent the current state of polymer and macromolecular science and technology in Chile and give an image of what is carried out in this field in our country.

Prof. Dr. Bernabé L. Rivas Quiroz
Dr. Julio Poblete
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

  • polymer composites
  • biopolymers
  • synthetic polymers
  • characterization

Published Papers (3 papers)

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Research

15 pages, 5055 KiB  
Article
Comparative Study of the Removal Efficiency of Nalidixic Acid by Poly[(4-vinylbenzyl)trimethylammonium Chloride] and N-Alkylated Chitosan through the Ultrafiltration Technique and Its Approximation through Theoretical Calculations
by Daniel A. Palacio, Carla Muñoz, Manuel Meléndrez, Walter A. Rabanal-León, Juliana A. Murillo-López, Manuel Palencia and Bernabé L. Rivas
Polymers 2023, 15(15), 3185; https://doi.org/10.3390/polym15153185 - 27 Jul 2023
Cited by 1 | Viewed by 802
Abstract
Emerging antibiotic contaminants in water is a global problem because bacterial strains resistant to these antibiotics arise, risking human health. This study describes the use of poly[(4-vinylbenzyl) trimethylammonium chloride] and N-alkylated chitosan, two cationic polymers with different natures and structures to remove nalidixic [...] Read more.
Emerging antibiotic contaminants in water is a global problem because bacterial strains resistant to these antibiotics arise, risking human health. This study describes the use of poly[(4-vinylbenzyl) trimethylammonium chloride] and N-alkylated chitosan, two cationic polymers with different natures and structures to remove nalidixic acid. Both contain ammonium salt as a functional group. One of them is a synthetic polymer, and the other is a modified artificial polymer. The removal of the antibiotic was investigated under various experimental conditions (pH, ionic strength, and antibiotic concentration) using the technique of liquid-phase polymer-based retention (LPR). In addition, a stochastic algorithm provided by Fukui’s functions is used. It was shown that alkylated N-chitosan presents 65.0% removal at pH 7, while poly[(4-vinylbenzyl)trimethylammonium chloride] removes 75.0% at pH 9. The interaction mechanisms that predominate the removal processes are electrostatic interactions, π–π interactions, and hydrogen bonding. The polymers reached maximum retention capacities of 1605 mg g−1 for poly[(4-vinylbenzyl) trimethylammonium chloride] and 561 mg g−1 of antibiotic per gram for alkylated poly(N-chitosan). In conclusion, the presence of aromatic groups improves the capacity and polymer–antibiotic interactions. Full article
(This article belongs to the Special Issue State-of-the-Art Polymer Science and Technology in Chile (2022,2023))
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25 pages, 7790 KiB  
Article
Adsorption of Copper and Arsenic from Water Using a Semi-Interpenetrating Polymer Network Based on Alginate and Chitosan
by Mohammad T. ALSamman and Julio Sánchez
Polymers 2023, 15(9), 2192; https://doi.org/10.3390/polym15092192 - 5 May 2023
Cited by 3 | Viewed by 3034
Abstract
New biobased hydrogels were prepared via a semi-interpenetrating polymer network (semi-IPN) using polyacrylamide/chitosan (PAAM/chitosan) hydrogel for the adsorption of As(V) or poly acrylic acid/alginate (PAA/alginate) hydrogel for the adsorption of Cu(II). Both systems were crosslinked using N,N′-methylenebisacrylamide as the crosslinker and ammonium persulfate [...] Read more.
New biobased hydrogels were prepared via a semi-interpenetrating polymer network (semi-IPN) using polyacrylamide/chitosan (PAAM/chitosan) hydrogel for the adsorption of As(V) or poly acrylic acid/alginate (PAA/alginate) hydrogel for the adsorption of Cu(II). Both systems were crosslinked using N,N′-methylenebisacrylamide as the crosslinker and ammonium persulfate as the initiating agent. The hydrogels were characterized by SEM, Z-potential, and FTIR. Their performance was studied under different variables, such as the biopolymer effect, adsorbent dose, pH, contact time, and concentration of metal ions. The characterization of hydrogels revealed the morphology of the material, with and without biopolymers. In both cases, the added biopolymer provided porosity and cavities’ formation, which improved the removal capacity. The Z-potential informed the surface charge of hydrogels, and the addition of biopolymers modified it, which explains the further metal removal ability. The FTIR spectra showed the functional groups of the hydrogels, confirming its chemical structure. In addition, the adsorption results showed that PAAM/chitosan can efficiently remove arsenic, reaching a capacity of 17.8 mg/g at pH 5.0, and it can also be regenerated by HNO3 for six cycles. On the other hand, copper-ion absorption was studied on PAA/alginate, which can remove with an adsorption capacity of 63.59 mg/g at pH 4.0, and the results indicate that it can also be regenerated by HNO3 for five cycles. Full article
(This article belongs to the Special Issue State-of-the-Art Polymer Science and Technology in Chile (2022,2023))
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10 pages, 3347 KiB  
Article
Spraying Fluorinated Silicon Oxide Nanoparticles on CuONPs@CF-PVDF Membrane: A Simple Method to Achieve Superhydrophobic Surfaces and High Flux in Direct Contact Membrane Distillation
by Zivka Lenac, César Saldías, Claudio A. Terraza, Angel Leiva, Joachim Koschikowski, Daniel Winter, Alain Tundidor-Camba and Rudy Martin-Trasanco
Polymers 2022, 14(23), 5164; https://doi.org/10.3390/polym14235164 - 27 Nov 2022
Cited by 3 | Viewed by 1572
Abstract
Desalinization of seawater can be achieved by membrane distillation techniques (MD). In MD, the membranes should be resistant to fouling, robust for extended operating time, and preferably provide a superhydrophobic surface. In this work, we report the preparation and characterization of a robust [...] Read more.
Desalinization of seawater can be achieved by membrane distillation techniques (MD). In MD, the membranes should be resistant to fouling, robust for extended operating time, and preferably provide a superhydrophobic surface. In this work, we report the preparation and characterization of a robust and superhydrophobic polyvinylidene fluoride membrane containing fluoroalkyl-capped CuONPs (CuONPs@CF) in the inner and fluorinated capped silicon oxide nanoparticles (SiO2NPs@CF) on its surface. SiO2NPs@CF with a mean diameter of 225 ± 20 nm were prepared by the sol method using 1H,1H,2H,2H-perfluorodecyltriethoxysilane as a capping agent. Surface modification of the membrane was carried out by spraying SiO2NPs@CF (5% wt.) dispersed in a mixture of dimethyl formamide (DMF) and ethanol (EtOH) at different DMF/EtOH % v/v ratios (0, 5, 10, 20, and 50). While ethanol dispersed the nanoparticles in the spraying solution, DMF dissolved the PVDF on the surface and retained the sprayed nanoparticles. According to SEM micrographs and water contact angle measurements, the best results were achieved by depositing the nanoparticles at 10% v/v of DMF/EtOH. Under these conditions, a SiO2NPs covered surface was observed with a water contact angle of 168.5°. The water contact angle was retained after the sonication of the membrane, indicating that the modification was successfully achieved. The membrane with SiO2NPs@CF showed a flux of 14.3 kg(m2·h)−1, 3.4 times higher than the unmodified version. The method presented herein avoids the complicated modification procedure offered by chemical step modification and, due to its simplicity, could be scalable to a commercial membrane. Full article
(This article belongs to the Special Issue State-of-the-Art Polymer Science and Technology in Chile (2022,2023))
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