materials-logo

Journal Browser

Journal Browser

Polymers Assembly and Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Polymeric Materials".

Deadline for manuscript submissions: closed (31 October 2021) | Viewed by 5484

Special Issue Editor


E-Mail Website1 Website2
Guest Editor
A.V.Topchiev Institute of Petrochemical Synthesis, RAS, Moscow, Russia
Interests: non-covalent interactions in polymers; polymer structure; quantum chemical modeling; IR spectroscopy of polymers; polymer composite materials; polymer matrix

Special Issue Information

Dear Colleagues,

Intermolecular interactions form the basis of the theory of the physical network of entanglements in polymer systems and substantiate the physicochemical properties of polymer materials. At the same time, low-energy non-covalent polymer–solvent interactions in synthetic polymers, until recently, were on the periphery of the attention of science in relation to high molecular weight compounds. Interest in the “structure–properties” problem in the context of the study of non-covalent bonds of macromolecules with low-molecular substances has sharply increased since the early 2000s—when the active study of supramolecular structures began. In 2016, the book Non-Covalent Interactions in the Design and Synthesis of New Compounds was published (ed. A.M. Maharramov and others) and, in 2019, under the auspices of IUPAC, the International Conference on Noncovalent Interactions (ICNI, 2019, Lisbon) started.

Nevertheless, the main contribution to the modern vision of the role of non-covalent interactions with low molecular weight compounds was made by works on organic, inorganic and organometallic synthesis and catalysis, obtaining crystals and biomaterials. At the same time, such an extensive field of knowledge as polymer materials science was practically out of sight, despite the fact that that non-covalent interactions in polymer objects are important both for understanding the mechanism of many processes and for controlling these processes.

Hence, it follows that, in order to obtain polymeric materials with certain physicochemical and, in some cases, mechanical strength characteristics, it is necessary to understand the role of non-covalent macromolecule–low-molecular substance interactions in the formation of certain structural features in synthetic polymers and especially the composite materials based on them.

Dr. Julia V. Kostina
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. Materials 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 2600 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

  • non-covalent interactions
  • ordering of glassy amorphous polymers
  • residual solvent
  • effect of low-energy interactions on the structure of polymers

Published Papers (2 papers)

Order results
Result details
Select all
Export citation of selected articles as:

Research

17 pages, 4786 KiB  
Article
Impedance, Electrical Equivalent Circuit (EEC) Modeling, Structural (FTIR and XRD), Dielectric, and Electric Modulus Study of MC-Based Ion-Conducting Solid Polymer Electrolytes
by Balen K. Faris, Ary A. Hassan, Shujahadeen B. Aziz, Mohamad A. Brza, Aziz M. Abdullah, Ari A. Abdalrahman, Ola A. Abu Ali and Dalia I. Saleh
Materials 2022, 15(1), 170; https://doi.org/10.3390/ma15010170 - 27 Dec 2021
Cited by 16 | Viewed by 2442
Abstract
The polymer electrolyte system of methylcellulose (MC) doped with various sodium bromide (NaBr) salt concentrations is prepared in this study using the solution cast technique. FTIR and XRD were used to identify the structural changes in solid films. Sharp crystalline peaks appeared at [...] Read more.
The polymer electrolyte system of methylcellulose (MC) doped with various sodium bromide (NaBr) salt concentrations is prepared in this study using the solution cast technique. FTIR and XRD were used to identify the structural changes in solid films. Sharp crystalline peaks appeared at the XRD pattern at 40 and 50 wt.% of NaBr salt. The electrical impedance spectroscopy (EIS) study illustrates that the loading of NaBr increases the electrolyte conductivity at room temperature. The DC conductivity of 6.71 × 10−6 S/cm is obtained for the highest conducting electrolyte. The EIS data are fitted with the electrical equivalent circuit (EEC) to determine the impedance parameters of each film. The EEC modeling helps determine the circuit elements, which is decisive from the engineering perspective. The DC conductivity tendency is further established by dielectric analysis. The EIS spectra analysis shows a decrease in bulk resistance, demonstrating free ion carriers and conductivity boost. The dielectric property and relaxation time confirmed the non-Debye behavior of the electrolyte system. An incomplete semicircle further confirms this behavior model in the Argand plot. The distribution of relaxation times is related to the presence of conducting ions in an amorphous structure. Dielectric properties are improved with the addition of NaBr salt. A high value of a dielectric constant is seen at the low frequency region. Full article
(This article belongs to the Special Issue Polymers Assembly and Applications)
Show Figures

Figure 1

15 pages, 2028 KiB  
Article
The Scissors Effect in Action: The Fox-Flory Relationship between the Glass Transition Temperature of Crosslinked Poly(Methyl Methacrylate) and Mc in Nanophase Separated Poly(Methyl Methacrylate)-l-Polyisobutylene Conetworks
by Szabolcs Pásztor, Bálint Becsei, Györgyi Szarka, Yi Thomann, Ralf Thomann, Rolf Mühlhaupt and Béla Iván
Materials 2020, 13(21), 4822; https://doi.org/10.3390/ma13214822 - 28 Oct 2020
Cited by 9 | Viewed by 2655
Abstract
The glass transition temperature (Tg) is one of the most important properties of polymeric materials. In order to reveal whether the scissors effect, i.e., the Fox–Flory relationship between Tg and the average molecular weight between crosslinking points ( [...] Read more.
The glass transition temperature (Tg) is one of the most important properties of polymeric materials. In order to reveal whether the scissors effect, i.e., the Fox–Flory relationship between Tg and the average molecular weight between crosslinking points (Mc), reported only in one case for polymer conetworks so far, is more generally effective or valid only for a single case, a series of poly(methyl methacrylate)-l-polyisobutylene (PMMA-l-PIB) conetworks was prepared and investigated. Two Tgs were found for the conetworks by DSC. Fox–Flory type dependence between Tg and Mc of the PMMA component (Tg = Tg,∞K/Mc) was observed. The K constants for the PMMA homopolymer and for the PMMA in the conetworks were the same in the margin of error. AFM images indicated disordered bicontinuous, mutually nanoconfined morphology with average domain sizes of 5–20 nm, but the correlation between Tg and domain sizes was not found. These new results indicate that the macrocrosslinkers act like molecular scissors (scissors effect), and the Tg of PMMA depend exclusively on the Mc in the conetworks. Consequently, these findings mean that the scissors effect is presumably a general phenomenon in nanophase-separated polymer conetworks, and this finding could be utilized in designing, processing, and applications of these novel materials. Full article
(This article belongs to the Special Issue Polymers Assembly and Applications)
Show Figures

Figure 1

Back to TopTop