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Special Issue "Synthesis, Characterization and Applications of Natural Polymers"

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A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Biomacromolecules, Biobased and Biodegradable Polymers".

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 3882

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Special Issue Editors

Prof. Dr. Vitor Augusto dos Santos Garcia
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Guest Editor

Faculty of Agricultural Sciences, São Paulo State University (UNESP), Botucatu 18610-034, Brazil
Interests: foods science and technology

Dr. Silvia Maria Martelli
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Guest Editor

Faculty of Engineering, Federal University of Grande Dourados, Dourados, Brazil
Interests: biopolymers; biodegradable polymers; blends and polymer composites

Prof. Dr. Farayde Matta Fakhouri

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Guest Editor

Department of Materials Science and Engineering, Universitat Politècnica de Catalunya (UPC BarcelonaTech), 08222 Terrassa, Spain
Interests: edible packaging; edible coatings; food packaging; starch
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Special Issue Information

Dear Colleagues,

This Special Issue of Polymers on the “Synthesis, Characterization, and Applications of Natural Polymers” is dedicated to the dissemination of relevant research articles that demonstrate advances in the area in this broad field. The production, characterization, and use of natural polymers have increased in recent years, and they are widely used in various fields of the pharmaceutical, food, medical, and cosmetic industries and in everyday life. To obtain these polymers, several modifications are carried out, to obtain the desired properties, in addition to being considered from renewable sources. It is my pleasure to invite you to submit your manuscript and contribute significantly to this edition.

Prof. Dr. Vitor Augusto dos Santos Garcia
Dr. Silvia Maria Martelli
Prof. Dr. Farayde Matta Fakhouri
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

natural polymers
applications
polymer synthesis
films
delivery system
oral films

Published Papers (3 papers)

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Research

Open AccessArticle

Influence of Alkali Treatment of Jatropha Curcas L. Filler on the Service Life of Hybrid Adhesive Bonds under Low Cycle Loading

and

Polymers 2023, 15(2), 395; https://doi.org/10.3390/polym15020395 - 12 Jan 2023

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Abstract

The aim of this research was to evaluate the effect of untreated and 5% aqueous NaOH solution-treated filler of the plant Jatropha Curcas L. on the mechanical properties of adhesive bonds, especially in terms of their service life at different amplitudes of cyclic loading. As a result of the presence of phorbol ester, which is toxic, Jatropha oilseed cake cannot be used as livestock feed. The secondary aim was to find other possibilities for the utilization of natural waste materials. Another use is as a filler in polymer composites, that is, in composite adhesive layers. The cyclic loading of the adhesive bonds was carried out for 1000 cycles in two amplitudes, that is, 5–30% of the maximum force and 5–50% of the maximum force, which was obtained by the static tensile testing of the adhesive bonds with unmodified filler. The static tensile test showed an increase in the shear strength of the adhesive bonds with alkali-treated filler compared to the untreated filler by 3–41%. The cyclic test results did not show a statistically significant effect of the alkaline treatment of the filler surface on the service life of the adhesive bonds. Positive changes in the strain value between adhesive bonds with treated and untreated filler were demonstrated at cyclic stress amplitudes of 5–50%. SEM analysis showed the presence of interlayer defects in the layers of the tested materials, which are related to the oil-based filler used. Full article

(This article belongs to the Special Issue Synthesis, Characterization and Applications of Natural Polymers)

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Open AccessArticle

Comparison of the Degree of Acetylation of Chitin Nanocrystals Measured by Various Analysis Methods

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Polymers 2023, 15(2), 294; https://doi.org/10.3390/polym15020294 - 06 Jan 2023

Cited by 1 | Viewed by 1329

Abstract

Chitin and its derivate chitosan have versatile properties and have been used in various applications. One key parameter determining the functionality of chitin-based materials is the degree of acetylation (DA). For DA determination, NMR and FTIR spectroscopy are often considered to be the gold standard, but these techniques may not always be available and are rather time-consuming and costly. The first derivative UV method has been suggested, although accurate measurements can be challenging for materials with high degrees of acetylation, due to hydroxymethylfurfural (HMF) formation and other side reactions occurring. In this paper, we re-evaluated the first derivate UV method for chitin and chitosan powder, chitin nanocrystals, and deacetylated chitin nanocrystals. Our results showed that the first derivative UV method is capable of measuring DA with high accuracy (>0.9), leading to values comparable to those obtained by ¹H NMR, ¹³C NMR, and FTIR. Moreover, by-product formation could either be suppressed by selecting the proper experimental conditions, or be compensated. For chitin nanocrystals, DA calculation deviations up to 20% due to by-product formation can be avoided with the correction that we propose. We conclude that the first derivative UV method is an accessible method for DA quantification, provided that sample solubility is warranted. Full article

(This article belongs to the Special Issue Synthesis, Characterization and Applications of Natural Polymers)

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Open AccessArticle

Assessment of Acute Oral Toxicity of Thiolated Gum Ghatti in Rats

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Polymers 2022, 14(18), 3836; https://doi.org/10.3390/polym14183836 - 14 Sep 2022

Cited by 1 | Viewed by 1203

Abstract

Various drug delivery systems were developed using a modified form of gum ghatti. Modifying gum ghatti using thioglycolic acid improves its mucoadhesive property, and hence, it is a suitable approach for the fabrication and development of controlled drug delivery systems. In accordance with regulatory guidelines, namely, the Organization for Economic Co-operation and Development’s (OECD) 423 guidelines, an acute oral dose toxicity study was performed to examine the toxicological effects of gum ghattiin an animal (Wistar rat) after a single oral dose administration of pure gum ghatti and thiolated gum ghatti. Orally administered pure and thiolated gum ghatti do not reveal any considerable change in the behavioral pattern, food intake, body weight, hematology, or clinical symptoms of treated animals. Furthermore, histopathological studies showed no pathological mutations in the vital organs of Wistar rats after the oral administration of single doses of both types of gumghatti (i.e., 300 mg/kg and 2000 mg/kg body weight). Whole blood clotting studies showed the low absorbance value of the modified gum (thiolated gum ghatti) in contrast to the pure gum and control, hence demonstrating its excellent clotting capability. The aforementioned toxicological study suggested that the oral administration of a single dose of pure and thiolated gum ghatti did not produce any toxicological effects in Wistar rats. Consequently, it could be a suitable and safe candidate for formulating various drug delivery systems. Full article

(This article belongs to the Special Issue Synthesis, Characterization and Applications of Natural Polymers)

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