Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
4.5
2.7
Journals
Applied Sciences
Special Issues
Advanced Polymers Synthesis, Analysis and Applications
share announcement

Advanced Polymers Synthesis, Analysis and Applications

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: closed (31 January 2024) | Viewed by 8999

Special Issue Editor

Dr. Ludmila L. Semenycheva

E-Mail Website
Guest Editor
Department of Chemistry of Organic and Macromolecular Compounds, Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod 603950, Russia
Interests: synthesis, isolation and properties of synthetic and natural polymers; their practical applications

Special Issue Information

Dear Colleagues,

Thanks to their unique properties, polymeric materials have become an integral part of everyday life. Requirements for the performance characteristics of polymer materials are inextricably linked with the use of new approaches to the processes of polymer synthesis and modification. Scientists are aiming to solve these problems. The priority areas for the development of polymer materials’ chemistry should include research consistent with the principles of "green chemistry". Polymers with precisely controlled structures and functions occupy a special place. They are in high demand in a wide range of applications spanning the life sciences and nanotechnology, and require the most careful study of molecular and supramolecular structures. Studies of biopolymers, including both natural fragments and synthetic ones, have become especially relevant. This Special Issue welcomes publications with new research results, including interdisciplinary ones, in the form of full articles, short reports or review articles, reflecting important and recent developments in the field of polymer synthesis along with their analysis and application in various spheres of human life. I invite you to present your research results in this Special Issue.

Dr. Ludmila L. Semenycheva
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. Applied Sciences 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 2400 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

  • synthesis of (co)polymers
  • biopolymers
  • modification
  • property analysis
  • applications

Published Papers (7 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

12 pages, 4223 KiB  
Article
New Composite Materials with Cross-Linked Structures Based on Grafted Copolymers of Acrylates on Cod Collagen
by Semenycheva Ludmila, Chasova Victoria, Sukhareva Angelina, Fukina Diana, Koryagin Andrey, Valetova Natalia, Smirnova Olga and Suleimanov Evgeny
Appl. Sci. 2023, 13(9), 5455; https://doi.org/10.3390/app13095455 - 27 Apr 2023
Cited by 1 | Viewed by 915
Abstract
This article presents new composite materials with cross-linked structures based on grafted copolymers of collagen with acrylates, which were prepared under photocatalytic conditions using the complex oxide RbTe1.5W0.5O6 and additional modifiers. Cross-linking agents for acrylate fragments were used. [...] Read more.
This article presents new composite materials with cross-linked structures based on grafted copolymers of collagen with acrylates, which were prepared under photocatalytic conditions using the complex oxide RbTe1.5W0.5O6 and additional modifiers. Cross-linking agents for acrylate fragments were used. Triethylene glycol dimethacrylate (TEDMA) was used in small volumes, and acrylic acid (AA) was used in an amount similar to the MMA concentration. The properties of the obtained graft copolymers were studied. Thus, collagen containing acrylate graft copolymers with cross-linked structures, which are highly soluble in water, was obtained. Addition of the protein substrate modifier (polyethylene glycol (PEG)) in an amount comparable to collagen resulted in a coagulate with a cross-linked structure. The gel easily released water during drying in vacuum and formed a polymer composite film. According to the results, the new polymer materials which were obtained were fungi-resistant. Due to observed properties, the obtained polymer samples could be considered as new materials for medical products, including colloidal solutions, gels, films. Full article
(This article belongs to the Special Issue Advanced Polymers Synthesis, Analysis and Applications)
►▼ Show Figures

Figure 1

16 pages, 23089 KiB  
Article
Mechanical and Thermophysical Properties of Epoxy Nanocomposites with Titanium Dioxide Nanoparticles
by Yurii S. Bukichev, Lyudmila M. Bogdanova, Valentina A. Lesnichaya, Nikita V. Chukanov, Nina D. Golubeva and Gulzhian I. Dzhardimalieva
Appl. Sci. 2023, 13(7), 4488; https://doi.org/10.3390/app13074488 - 01 Apr 2023
Cited by 3 | Viewed by 1316
Abstract
The introduction of nanoparticles and their homogeneous distribution in the polymer matrix, as well as their size, can have a significant effect on the mechanical properties of composite materials. In this work, we studied the mechanical characteristics of TiO2/epoxy nanocomposites with [...] Read more.
The introduction of nanoparticles and their homogeneous distribution in the polymer matrix, as well as their size, can have a significant effect on the mechanical properties of composite materials. In this work, we studied the mechanical characteristics of TiO2/epoxy nanocomposites with different contents and sizes of nanoparticles. The preparation of nanocomposites was carried out by a stepwise curing (at 90 and 160 °C) of ED-20 dianic epoxy resin in the presence of an aromatic hardener with the addition of titanium (IV) dioxide nanoparticles preliminarily synthesized by the plasma-chemical method. Ultrasonic dispersion was used to achieve a uniform distribution of nanoparticles in the polymer matrix. The chemical and phase composition, the structure of the as-synthesized TiO2 nanoparticles, and the resulting epoxy nanocomposites were characterized by elemental analysis, X-ray diffraction, transmission and scanning electron microscopy, and infrared spectroscopy. The mechanical properties of the nanocomposites were determined by the static tensile test, and the impact toughness was determined by the Charpy method. The glass transition temperature and thermal stability of the TiO2/epoxy nanocomposites were studied by thermal analysis methods. The formation of an interfacial layer between the TiO2 nanoparticles and an epoxy matrix has been shown for the first time by spectral methods. It is shown that the mode of curing and ultrasonic dispersion used, as well as varying the content and dispersity of the TiO2 nanoparticles, make it possible to obtain epoxy nanocomposites with simultaneously improved deformation-strength characteristics and impact strength values. Full article
(This article belongs to the Special Issue Advanced Polymers Synthesis, Analysis and Applications)
►▼ Show Figures

Figure 1

12 pages, 5377 KiB  
Article
Mixtures of Cationic Linear Polymer and Anionic Polymeric Microspheres for Stabilization of Sand: Physicochemical, Structural and Mechanical Study
by Irina Panova, Evgeniya Shevaleva, Inessa Gritskova, Maxim Arzhakov and Alexander Yaroslavov
Appl. Sci. 2023, 13(7), 4311; https://doi.org/10.3390/app13074311 - 28 Mar 2023
Viewed by 1036
Abstract
Aqueous formulations based on anionic butadiene-styrene microspheres (BSMs) and cationic poly(diallyldimethylammonium chloride) (PDADMAC) with the weight PDADMAC fraction from 0 to 1 were studied as the stabilizers of loose sandy soils. In general, these systems were shown to be represented as the mixtures [...] Read more.
Aqueous formulations based on anionic butadiene-styrene microspheres (BSMs) and cationic poly(diallyldimethylammonium chloride) (PDADMAC) with the weight PDADMAC fraction from 0 to 1 were studied as the stabilizers of loose sandy soils. In general, these systems were shown to be represented as the mixtures of microspheres saturated with PDADMAC and unbound polycation. Mechanical testing of BSMs–PDADMAC films evidenced that with increasing weight PDADMAC fraction, a 20-fold growth in elastic modulus, 2-fold growth in strength and 2-fold decrease in ultimate strain of the material were observed. Treatment of the sand with the above formulations resulted in formation of a protective porous polymer-sand surface crust with the strength from 0.8 to 45.0 MPa. “Elasticity–rigidity” balance and water resistance of the crusts were controlled by weight fraction of polycation in the mixed formulation. Stable water-resistant polymer-sand crusts were shown to be prepared using formulations with the weight PDADMAC fraction from 0 to 0.2. The results indicated a great potential of the polymer-colloid formulations for the fabrication of structured sand coatings with controlled properties. Full article
(This article belongs to the Special Issue Advanced Polymers Synthesis, Analysis and Applications)
►▼ Show Figures

Figure 1

17 pages, 3059 KiB  
Article
Thermal Behavior of Biodegradable Compositions of Polylactide and Poly(3-hydroxybutyrate) with Chitosan and the Effect of UV Radiation on Their Structure
by Svetlana Rogovina, Sergei Lomakin, Sergey Usachev, Anastasia Yakhina, Lubov Zhorina and Alexander Berlin
Appl. Sci. 2023, 13(6), 3920; https://doi.org/10.3390/app13063920 - 20 Mar 2023
Cited by 1 | Viewed by 1474
Abstract
The negative influence of water pollution by heavy metals ions on human health represents a serious ecological problem which requires effective methods in the search for its solution. The creation of eco-friendly biodegradable polymer materials capable of performing the sorption of the water [...] Read more.
The negative influence of water pollution by heavy metals ions on human health represents a serious ecological problem which requires effective methods in the search for its solution. The creation of eco-friendly biodegradable polymer materials capable of performing the sorption of the water media of heavy metals followed by decomposition into harmless substances after the end of their service life presents an actual task. To this aim, binary compositions synthesized from natural raw polyesters polylactide (PLA) and poly(3-hydroxybutyrate) (PHB) with polysaccharide chitosan, corresponding to these requirements, were obtained in the liquid phase. The polyesters have mechanical characteristics close to the characteristics of synthetic polymers, while the chitosan containing the amino groups is capable of performing the sorption of heavy metals. The use of compositions on their base allows one to create the new inexpensive biodegradable sorbents stable in aqueous media as well as apply them as packing materials. The sorption capacity of PLA–chitosan and PHB–chitosan compositions in relation to iron ions from aqueous solutions was explored by a method of X-ray fluorescence analysis and it was established that the sorption of Fe3+ ions by PHB–chitosan composition is more than twice as high as that by the PLA–chitosan composition (2.30 and 0.66 wt. %, correspondingly, after sorption from 0.008 mol/L FeCl3 solution during 24 h). A comparative study of thermophysical parameters and the degree of crystallinity of PLA and PHB, as well as in their initial compositions and compositions, containing sorbed iron ions, was carried out by DSC method. The DSC analysis of the PLA–chitosan and PHB–chitosan compositions, containing sorbed iron ions, showed a slight decrease in the values of Tg, Tcc, and Tm as well as an increase in the enthalpy of cold crystallization and a reduction in the degree of crystallinity of these polyesters. At the same time, an increasing of the thermal stability of polyester compositions in the presence of iron ions was established. The influence of UV irradiation on the structure of PLA and PHB for 2, 5, 24, and 144 h was analyzed by FTIR spectroscopy and significant changes in the spectrum were observed. Based on the analysis of the IR spectra of PHB and PLA, it was concluded that, under the action of UV radiation, the destruction of ester bonds takes place, which is expressed in the appearance of intense bands characterizing the formation of new structural units, resulting in the decrease in the molecular weight of polyesters. Full article
(This article belongs to the Special Issue Advanced Polymers Synthesis, Analysis and Applications)
►▼ Show Figures

Figure 1

14 pages, 1232 KiB  
Article
Repulsive Force for Micro- and Nano-Non-Contact Manipulation
by Amélie Cot, Patrick Rougeot, Sophie Lakard, Michaël Gauthier and Jérôme Dejeu
Appl. Sci. 2023, 13(6), 3886; https://doi.org/10.3390/app13063886 - 18 Mar 2023
Viewed by 1145
Abstract
Non-contact positioning of micro-objects using electric fields has been widely explored, based on several physical principles such as electrophoresis, dielectrophoresis (DEP) or optical dielectrophoresis (ODEP), in which the actuation force is induced by an electric charge or an electric dipole placed in an [...] Read more.
Non-contact positioning of micro-objects using electric fields has been widely explored, based on several physical principles such as electrophoresis, dielectrophoresis (DEP) or optical dielectrophoresis (ODEP), in which the actuation force is induced by an electric charge or an electric dipole placed in an electric field. In this paper, we introduce a new way to control charges in non-contact positioning of micro-objects using chemical functionalization (3-aminopropyl) triethoxysilane—APTES) able to localize charges on a substrate and/or on a micro-object. We demonstrate that this functionalization in a liquid with a low ionic strength is able to concentrate a significant amount of electric charges on surfaces generating an electric field over a long distance (about 10 microns), also called a large exclusion zone (EZ). A model is proposed and validated with electrostatic force measurements between substrate and microparticles (diameter up to 40 µm). We demonstrate that the magnitude of the force and the force range decrease rapidly when the ionic strength of the medium increases. Based on the proposed model, we show that this new way to localize charges on micro-objects may be used for non-contact positioning. Full article
(This article belongs to the Special Issue Advanced Polymers Synthesis, Analysis and Applications)
►▼ Show Figures

Figure 1

20 pages, 4099 KiB  
Article
Influence of Monomer Sequence on the Cyclization Behavior of Poly(acrylonitrile-co-acrylamide)
by Roman V. Toms, Mikhail S. Balashov, Alexander Yu. Gervald, Nikolay I. Prokopov, Anna V. Plutalova and Elena V. Chernikova
Appl. Sci. 2023, 13(6), 3734; https://doi.org/10.3390/app13063734 - 15 Mar 2023
Cited by 1 | Viewed by 1292
Abstract
In this research, we have developed the approach to controlled synthesis of acrylonitrile-acrylamide copolymers with narrow molecular weight distribution and various monomer sequence distributions. By using dibenzyl trithiocarbonate and batch/semibatch polymerization, we have first synthesized random, gradient, and block-gradient copolymers containing 3.4–10.2 mol. [...] Read more.
In this research, we have developed the approach to controlled synthesis of acrylonitrile-acrylamide copolymers with narrow molecular weight distribution and various monomer sequence distributions. By using dibenzyl trithiocarbonate and batch/semibatch polymerization, we have first synthesized random, gradient, and block-gradient copolymers containing 3.4–10.2 mol. % of acrylamide and revealed the influence of the monomer sequence on the cyclization behavior of poly(acrylonitrile-co-acrylamide) by combination of differential scanning calorimetry and Fourier transform infrared spectroscopy. This allowed us to find differences in cyclization behavior of the copolymers in argon and air atmosphere. Intramolecular cyclization was the main process proceeding in argon atmosphere. The radical mechanism of cyclization was suppressed already at the molar part of acrylamide units in copolymer exceeding ~3 mol. % for random copolymer and ~6 mol. % for block-gradient copolymer. The activation energy of ionic cyclization was equal to 89 ± 3 kJ·mol−1 and was not influenced by both copolymer composition and chain microstructure in contrast to the rate of cyclization. The latter was increased with the rise of acrylamide content, the content of hetero-triads and in the range block-gradient < gradient < random structure. In air atmosphere, the oxidation reactions dominated over cyclization. The oxidation reactions were found to be less sensitive to copolymer composition and chain microstructure. Full article
(This article belongs to the Special Issue Advanced Polymers Synthesis, Analysis and Applications)
►▼ Show Figures

Figure 1

11 pages, 1250 KiB  
Article
Application of Thermochemical Method to Determine the Crystallinity Degree of Cellulose Materials
by Michael Ioelovich
Appl. Sci. 2023, 13(4), 2387; https://doi.org/10.3390/app13042387 - 13 Feb 2023
Cited by 1 | Viewed by 1085
Abstract
Currently, to characterize the crystallinity of cellulose, such an estimated parameter as the crystallinity index is used, measured by various methods and techniques. The main purpose of this article was to develop a thermochemical method for determining the real degree of crystallinity (X) [...] Read more.
Currently, to characterize the crystallinity of cellulose, such an estimated parameter as the crystallinity index is used, measured by various methods and techniques. The main purpose of this article was to develop a thermochemical method for determining the real degree of crystallinity (X) of cellulose based on the measurement of the enthalpy of wetting. Various cellulose samples, such as MCC, pure cotton cellulose, bleached wood pulps, mercerized celluloses, and viscose rayon fibers, were used. For these samples, the exothermic wetting enthalpy (ΔHw), the maximum amount of sorbed moisture (Ao), as well as the X-ray index of crystallinity (CrI) were studied. The dependence of ΔHw on Ao was linear and can be expressed by the equation: ΔHw = k Ao, where the coefficient k = −336 (J/g). After substituting the theoretical value Ao,a = 0.5 (g/g) into this equation, the numerical value of maximum wetting enthalpy ΔHw,a = −168 (J/g) for completely amorphous cellulose was obtained. As a result, the equation for calculating the real crystallinity degree (X) expressed in mass fractions was derived: X = 1 − (ΔHw/ΔHw,a). Analysis of the obtained results showed that only the X parameter can characterize the real content of crystallites in cellulose samples, instead of the approximate CrI parameter. Full article
(This article belongs to the Special Issue Advanced Polymers Synthesis, Analysis and Applications)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-7
Back to TopTop