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Materials
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Advanced Polymeric Microspheres: Structural and Thermal Properties
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Advanced Polymeric Microspheres: Structural and Thermal Properties

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

Deadline for manuscript submissions: closed (10 February 2024) | Viewed by 4219

Special Issue Editors

Dr. Małgorzata Maciejewska

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Guest Editor
Department of Polymer Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University in Lublin, Gliniana 33, 20-614 Lublin, Poland
Interests: synthesis of new monomers; synthesis of polymers and copolymers in the form of monolits and microsphres; synthesis of porous materials; chemical modification of polymers; investigation of the internal structure of the porous materials; hierarchical porous polymers; thermal (TG/DS) analysis of synthetic and natural polymers; ATR investigation; swelling studies; adsorption studies of water contaminants; inverse gas chromatography (IGC)
Special Issues, Collections and Topics in MDPI journals
Dr. Marta Grochowicz

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Guest Editor
Department of Polymer Chemistry, Institute of Chemical Sciences Faculty of Chemistry, Maria Curie-Sklodowska University in Lublin, M. Curie-Sklodowska Sq. 3, 20-031 Lublin, Poland
Interests: novel synthesis of functional monomers; functional polymer synthesis and characterization; functionalization of polymer surface; thermal properties of polymers; application of polymeric microspheres in separation processes; polymeric drug delivery systems
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In recent years, polymeric materials have become the backbone of the modern industry. In the polymer family, materials with spherical shapes (porous and non-porous beads, microspheres, nanospheres, etc.) hold the most prominent position, and they are among the most effective materials for their many separation processes. Microspheres are easy to prepare and handle; they do not possess sharp edges and may be readily used in packed beads for continuous flow operation. They are widely used as stationary phases in different kinds of chromatography, in immobilization technologies, drug delivery systems, nuclear imaging, cell culturing, and as specific sorbents. The application of the microspheres is strongly connected to their structural and thermal properties. Consequently, the detailed investigation of these features is one of the most important challenges.

This Special Issue will focus on the synthesis, characterization, modification, and thermal degradation of polymeric microspheres. Reviews, mini-reviews, original articles, and short communications covering the most recent advances in microsphere preparation and the characterization of structural and thermal properties are welcome.

Dr. Małgorzata Maciejewska
Dr. Marta Grochowicz
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. 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

  • polymeric microspheres
  • porous materials
  • thermal properties
  • thermogravimetry
  • differential scanning calorimetry
  • structure characterization
  • chemical modification
  • chromatography
  • adsorbents

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Published Papers (2 papers)

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Research

18 pages, 8634 KiB  
Article
Structural Hierarchy of PA6 Macromolecules after Hydrostatic Extrusion
by Monika Skorupska, Mariusz Kulczyk, Piotr Denis, Dominik Grzęda, Anna Czajka and Joanna Ryszkowska
Materials 2023, 16(9), 3435; https://doi.org/10.3390/ma16093435 - 28 Apr 2023
Cited by 4 | Viewed by 1900
Abstract
This article presents the influence of severe plastic deformation by hydrostatic extrusion (HE) on the thermal and structural properties of polyamide 6 (PA6). During the hydrostatic extrusion process, a fibrous structure oriented along the extrusion direction is formed, which was visualized during microscopic [...] Read more.
This article presents the influence of severe plastic deformation by hydrostatic extrusion (HE) on the thermal and structural properties of polyamide 6 (PA6). During the hydrostatic extrusion process, a fibrous structure oriented along the extrusion direction is formed, which was visualized during microscopic observations. The degree of crystallinity was analyzed by differential scanning calorimetry (DSC). Wide-angle X-ray scattering diffraction (WAXS) analysis was used to partially characterize the PA6 structure after the HE process. The contents of various forms of the crystalline phase in PA6 samples before and after the HE process were analyzed in fragments of spectroscopy in infrared (FTIR). The favorable properties of PA6 after the HE process were obtained after deformation under conditions generating an adiabatic temperature higher than the glass transition temperature and lower than the temperature of the onset of melting of the crystalline phase. Thermal analysis using DSC allowed us to conclude that in the PA6 after the HE process generating deformations in the range of 0.68–1.56, the proportion of the crystalline phase α increases in PA6. As the deformation increases in the HE process, the crystalline phase proportion increases by 12% compared to the initial material (before HE). The glass transition temperature of PA6 is ca. 50.6 °C, reduced for the sample after the HE process at a small deformation of 0.68 (PA6_0.68) to ca. 44.2 °C. For other samples, Tg is ca. 53.2–53.5 °C. As a result of the analysis of WAXS diffractograms of PA6 samples after various deformations in the HE process, the presence of typical peaks of phases α1 and α2 and γ was observed. The results of the FTIR spectroscopic analysis confirm these observations that as the deformation increases, the proportion of the crystalline phase α increases. Full article
(This article belongs to the Special Issue Advanced Polymeric Microspheres: Structural and Thermal Properties)
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14 pages, 4756 KiB  
Article
Porous Polymers Based on 9,10-Bis(methacryloyloxymethyl)anthracene—Towards Synthesis and Characterization
by Małgorzata Maciejewska and Mateusz Józwicki
Materials 2023, 16(7), 2610; https://doi.org/10.3390/ma16072610 - 25 Mar 2023
Cited by 4 | Viewed by 1813
Abstract
Porous materials can be found in numerous essential applications. They are of particular interest when, in addition to their porosity, they have other advantageous properties such as thermal stability or chemical diversity. The main aim of this study was to synthesize the porous [...] Read more.
Porous materials can be found in numerous essential applications. They are of particular interest when, in addition to their porosity, they have other advantageous properties such as thermal stability or chemical diversity. The main aim of this study was to synthesize the porous copolymers of 9,10-bis(methacryloyloxymethyl)anthracene (BMA) with three different co-monomers divinylbenzene (DVB), ethylene glycol dimethacrylate (EGDMA) and trimethylpropane trimethacrylate (TRIM). They were synthesized via suspension polymerization using chlorobenzene and toluene served as porogenic solvents. For the characterization of the synthesized copolymers ATR-FTIR spectroscopy, a low-temperature nitrogen adsorption–desorption method, thermogravimetry, scanning electron microscopy, inverse gas chromatography and size distribution analysis were successfully employed. It was found that depending on the used co-monomer and the type of porogen regular polymeric microspheres with a specific surface area in the range of 134–472 m2/g can be effectively synthesized. The presence of miscellaneous functional groups promotes divergent types of interactions Moreover, all of the copolymers show a good thermal stability up to 307 °C. What is important, thanks to application of anthracene derivatives as the functional monomer, the synthesized materials show fluorescence under UV radiation. The obtained microspheres can be used in various adsorption techniques as well as precursor for thermally resistant fluorescent sensors. Full article
(This article belongs to the Special Issue Advanced Polymeric Microspheres: Structural and Thermal Properties)
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