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Polymers
Special Issues
Plastic Packaging - Challenges and Opportunities
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Plastic Packaging - Challenges and Opportunities

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

Deadline for manuscript submissions: closed (28 February 2023) | Viewed by 2005

Special Issue Editor

Dr. Renata Nunes Oliveira

E-Mail Website
Guest Editor
Chemical Engineering Department, Federal Rural University of Rio de Janeiro—UFRRJ, Seropédica 23890-000, RJ, Brazil
Interests: biomaterials; sustainable and cosmeceutical packaging

Special Issue Information

Dear Colleagues,

This Special Issue aims to map the main plastic packaging materials and their global impact. Plastic packaging is present in everyday life. Although it is difficult to visualize a life without plastics, the planet’s carbon cycle is under stress by the amount of plastic packaging discarded annually. Among the main packaging materials are plastic packaging made from commodity plastics and biodegradable ones. Replacing non-degradable packages is one solution, but it may not be the only one. There are many answers for the same question. Additionally, there is the challenge of microplastics, one of the main problems related to inappropriately discarded plastic packaging.

Dr. Renata Nunes Oliveira
Guest Editor

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

  • plastic packages
  • biodegradable packages
  • active packages
  • intelligent packages
  • microplastics
  • environmental impact

Published Papers (1 paper)

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Research

15 pages, 3220 KiB  
Article
Moisture Sorption Isotherms and Thermodynamic Properties of Biodegradable Polymers for Application in Food Packaging Industry
by Loleny Tavares, Liliana R. Sousa, Sara Magalhães da Silva, Paulo S. Lima and J. M. Oliveira
Polymers 2023, 15(7), 1634; https://doi.org/10.3390/polym15071634 - 24 Mar 2023
Cited by 2 | Viewed by 1688
Abstract
This work aims to evaluate the influence of two starch-based materials (B16 and B20) on the moisture sorption isotherms, determined at 30, 40, and 50 °C, where B16 contains 5% (w/w) more starch than B20. Thermodynamic functions (differential enthalpy (∆Hdif), differential [...] Read more.
This work aims to evaluate the influence of two starch-based materials (B16 and B20) on the moisture sorption isotherms, determined at 30, 40, and 50 °C, where B16 contains 5% (w/w) more starch than B20. Thermodynamic functions (differential enthalpy (∆Hdif), differential entropy (∆Sdif), integral enthalpy (Δhint), integral entropy (ΔSint), free Gibbs energy (∆G), and spreading pressure (φ)) were used to understand the water-binding behaviors and the energy requirements to remove the moisture content from the surface of these materials. The moisture sorption isotherms exhibited type III behavior, and the Guggenheim–Anderson–de Boer (GAB) model was the most suitable to fit the experimental moisture adsorption data. The adsorption isotherms of microparticles were enthalpy-controlled, with isokinetic temperature values of 221.45 and 279.77 K for B16 and B20, respectively, being higher than the harmonic mean temperature (312.94 K). The values of ∆G were positive (45.274 and 44.307 kJmol−1 for B16 and B20, respectively), indicating a non-spontaneous process. The spreading pressure values increased with increasing water activity (aw) for all isotherms. Higher values of ∆Hdif and ∆Sdif obtained from B16 confirmed its higher number of sorption sites available for binding with water molecules when compared to B20, making it less suitable for application in the food packaging industry. Full article
(This article belongs to the Special Issue Plastic Packaging - Challenges and Opportunities)
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