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Articoli di riviste sul tema "Particules de polymère"

Autore: Grafiati

Pubblicato: 21 dicembre 2024

Ultima modifica: 31 luglio 2025

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1

Chabert, Emmanuelle, Laurent Chazeau, Catherine Gauthier, Rémy Dendievel, and Jean-Yves Cavaillé. "Nanocomposites base polymère, renforcés par des particules rigides." Mécanique & Industries 5, no. 4 (2004): 489–96. http://dx.doi.org/10.1051/meca:2004049.

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Nguyen, Trang, Dris Rachid, Sabrina Guérin, Bruno Tassin, and Johnny Gasperi. "Transfert de microplastiques via le réseau d’assainissement unitaire : des dépôts au sein du réseau aux rejets urbains de temps de pluie." Techniques Sciences Méthodes, TSM 12/2024 (December 22, 2024): 107–15. https://doi.org/10.36904/tsm/202412107.

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S’il est reconnu dans la littérature que les eaux résiduaires urbaines véhiculent une charge en microplastiques (MP) importante, la contamination des dépôts de réseaux d’assainissement et des rejets urbains de temps de pluie restait jusqu’à lors inexplorée, malgré une contamination potentiellement importante. Les concentrations observées pour les dépôts (entre 5×103 à 178×103 particules/kg de sédiment sec) témoignent en effet qu’une partie des microplastiques véhiculées par les eaux usées peut sédimenter. Indépendamment du polymère considéré, la sédimentation d’une partie des microplastiques a

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Alshidi, Weeam, Tarek Ganat, Hamoud Al-Hadrami, Alireza Kazemi, Faras Al Balushi, and Hai T. Nguyen. "MWCNT Nanofluids Enhance Polymer Flooding Viscosity Through Particular Molecular Interactions." Journal of Physics: Conference Series 3027, no. 1 (2025): 012051. https://doi.org/10.1088/1742-6596/3027/1/012051.

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Abstract Improved oil recovery methods are essential to fulfill the world’s energy needs and maximize oil recovery from older oilfields. In order to boost the viscosity of injection water and enhance sweep efficiency, high molecular weight polymers, such as partially hydrolyzed polyacrylamides (HPAMs) are injected in a technique known as polymer flooding, which is a potential EOR technique. However, obstacles like excessive salinity and high temperatures can make polymer flooding less successful. In order to increase viscosity, thermal stability, and oil recovery results, recent research has c

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4

Guyot, A., R. Audebert, R. Botet, et al. "Floculation de particules colloïdales par les polymères hydrosolubles." Journal de Chimie Physique 87 (1990): 1859–99. http://dx.doi.org/10.1051/jcp/1990871859.

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Guyot, A. "Synthèse de petites particules polymères sphérique de taille contrôlée." Journal de Chimie Physique 84 (1987): 1085–93. http://dx.doi.org/10.1051/jcp/1987841085.

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Kausar, Ayesha. "Potential of Polymer/Fullerene Nanocomposites for Anticorrosion Applications in the Biomedical Field." Journal of Composites Science 6, no. 12 (2022): 394. http://dx.doi.org/10.3390/jcs6120394.

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Initially, this review presents the fundamentals of corrosion-resistant polymer/fullerene nanocomposites. Then, the potential of polymer/fullerene nanocomposites for corrosion resistance in biomedical applications is presented. In particular, anticorrosion biomedical applications of fullerene-based nanomaterials are proposed for antimicrobial applications, drug delivery, bioimaging, etc. According to the literature, due to the low conductivity/anticorrosion features of pristine thermoplastic polymers, conjugated polymers (polyaniline, polypyrrole, polythiophene, etc.) with high corrosion resis

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7

Nellithala, Dheeraj, Parin Shah, and Paul Kohl. "(Invited) Durability and Accelerated Aging of Anion-Conducting Membranes and Ionomers." ECS Meeting Abstracts MA2022-02, no. 43 (2022): 1606. http://dx.doi.org/10.1149/ma2022-02431606mtgabs.

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Low-temperature, polymer-based fuel cells and water electrolyzers using anion conductive polymers have several potential advantages over acid-based polymer electrolyzers. However, the long-term durability of the ion conducting polymer has not been investigated to the same extent as proton conducting polymers. Further, accelerated aging test conditions with known acceleration factors have not been developed. In this study, a family of poly(norbornene) polymers used in fuel cells and electrolyzers was aged under a variety of conditions to determine the aging rate and acceleration factors. In par

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8

Walton, Jeffrey H. "A Review of ¹²⁹Xe NMR as a Probe of Polymer Morphology." Engineering Plastics 2, no. 1 (1994): 147823919400200. http://dx.doi.org/10.1177/147823919400200105.

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129 Xe NMR is a new tool for probing the morphology of polymers and polymer blends. Recent developments of the NMR of 129 Xe gas dissolved in polymers are reviewed. This technique yields information on polymer morphology via the NMR lineshape and the isotropic chemical shift and their temperature dependencies. Polymer glass transition temperatures are plainly evident. The miscibility of polymer blends is easily determined and thus phase diagrams may be mapped out. Of particular use is the potential ability to measure domain sizes in immiscible polymer blends by 2-D NMR techniques. Domain sizes

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9

Walton, Jeffrey H. "A Review of ¹²⁹Xe NMR as a Probe of Polymer Morphology." Polymers and Polymer Composites 2, no. 1 (1994): 35–41. http://dx.doi.org/10.1177/096739119400200105.

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129 Xe NMR is a new tool for probing the morphology of polymers and polymer blends. Recent developments of the NMR of 129 Xe gas dissolved in polymers are reviewed. This technique yields information on polymer morphology via the NMR lineshape and the isotropic chemical shift and their temperature dependencies. Polymer glass transition temperatures are plainly evident. The miscibility of polymer blends is easily determined and thus phase diagrams may be mapped out. Of particular use is the potential ability to measure domain sizes in immiscible polymer blends by 2-D NMR techniques. Domain sizes

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10

Al-Obaidi, Hisham, Mridul Majumder, and Fiza Bari. "Amorphous and Crystalline Particulates: Challenges and Perspectives in Drug Delivery." Current Pharmaceutical Design 23, no. 3 (2017): 350–61. http://dx.doi.org/10.2174/1381612822666161107162109.

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Crystalline and amorphous dispersions have been the focus of academic and industrial research due to their potential role in formulating poorly water-soluble drugs. This review looks at the progress made starting with crystalline carriers in the form of eutectics moving towards more complex crystalline mixtures. It also covers using glassy polymers to maintain the drug as amorphous exhibiting higher energy and entropy. However, the amorphous form tends to recrystallize on storage, which limits the benefits of this approach. Specific interactions between the drug and the polymer may retard this

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11

Shin, Dong Sig, Jae Hoon Lee, and Jeong Suh. "Microfabrication of Polymers Using KrF Excimer Laser Beam." Key Engineering Materials 326-328 (December 2006): 115–18. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.115.

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Pulsed UV laser beams, which are widely used in the processing of polymers, offer many advantages in the field of polymer production, primarily because their photon energy is higher than the binding energy of the polymer. In particular, the fabrication of polymers with an excimer laser process is faster and more convenient than with other processes. Nevertheless, some problems occur in the precision microprocessing of polymers, including the formation and deposition of surface debris, which is produced from the breakdown of either polymer chains or radical bonds. In the present work, a process

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12

Günther, Roman, Walter Caseri, and Christof Brändli. "Application of Atmospheric-Pressure Jet Plasma in the Presence of Acrylic Acid for Joining Polymers without Adhesives." Materials 16, no. 7 (2023): 2673. http://dx.doi.org/10.3390/ma16072673.

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This study investigates the treatment of surfaces with jet plasma at atmospheric pressure in the presence of acrylic acid as a resource-saving and efficient approach to joining polymers on polystyrene (PS) and polyamide 12 (PA 12) surfaces. Acrylic acid was added in order to introduce functional groups to the polymer surfaces. XPS analysis revealed a high density of oxygen-containing groups, e.g., carboxylic acid groups, on the polymer surfaces, the detailed composition depending on the polymer. The AFM measurements indicated that the modification of polyamide resulted in morphological changes

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13

Liu, Guifeng, Xudong Sun, Xiaodong Li, and Zhenxin Wang. "The Bioanalytical and Biomedical Applications of Polymer Modified Substrates." Polymers 14, no. 4 (2022): 826. http://dx.doi.org/10.3390/polym14040826.

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Polymers with different structures and morphology have been extensively used to construct functionalized surfaces for a wide range of applications because the physicochemical properties of polymers can be finely adjusted by their molecular weights, polydispersity and configurations, as well as the chemical structures and natures of monomers. In particular, the specific functions of polymers can be easily achieved at post-synthesis by the attachment of different kinds of active molecules such as recognition ligand, peptides, aptamers and antibodies. In this review, the recent advances in the bi

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14

Wang, Jinfang, Peter A. G. Cormack, David C. Sherrington, and Ezat Khoshdel. "Synthesis and characterization of micrometer-sized molecularly imprinted spherical polymer particulates prepared via precipitation polymerization." Pure and Applied Chemistry 79, no. 9 (2007): 1505–19. http://dx.doi.org/10.1351/pac200779091505.

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In this paper, the synthesis and characterization of molecularly imprinted spherical polymer particulates prepared via precipitation polymerization is described. The effects of the monomer and initiator concentrations and the solvent on the polymerizations were investigated systematically. Polymer microspheres with narrow size distributions and average diameters up to ca. 10 μm were prepared under optimized polymerization conditions. The morphologies of the microspheres were characterized by nitrogen sorption porosimetry and the molecular recognition properties of representative products evalu

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Yan, Haotian. "Synthetic Route And Application of Photodegradable Polymers." Highlights in Science, Engineering and Technology 21 (December 4, 2022): 324–31. http://dx.doi.org/10.54097/hset.v21i.3187.

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With the accumulating mass of land wastes, designing end-of-life principles for plastic wastes is becoming one of the most debated topics for polymer scientists. A developing family of materials called photodegradable polymers carries great environmental and commercial values. Photodegradable polymers will engage in photolysis under specific wavelengths, resulting in cleavages on the polymer backbone and smaller molecular weights. This research will discuss standard methods of photodegradation, such as Norris I&II, along with common photodegradable polymers and their functionalities. Examp

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16

Quezada, Gonzalo R., Norman Toro, Jorge Saavedra, et al. "Molecular Dynamics Study of the Conformation, Ion Adsorption, Diffusion, and Water Structure of Soluble Polymers in Saline Solutions." Polymers 13, no. 20 (2021): 3550. http://dx.doi.org/10.3390/polym13203550.

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Polymers have interesting physicochemical characteristics such as charge density, functionalities, and molecular weight. Such attributes are of great importance for use in industrial purposes. Understanding how these characteristics are affected is still complex, but with the help of molecular dynamics (MD) and quantum calculations (QM), it is possible to understand the behavior of polymers at the molecular level with great consistency. This study was applied to polymers derived from polyacrylamide (PAM) due to its great use in various industries. The polymers studied include hydrolyzed polyac

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17

Kaur, Harmeet, Virender Kumar, Krishan Kumar, Sandeep Rathor, Parveen Kumari, and Jasbir Singh. "Polymer Particulates in Drug Delivery." Current Pharmaceutical Design 22, no. 19 (2016): 2761–87. http://dx.doi.org/10.2174/1381612822666160217125734.

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He, Yuanxin, Hongyu Li, Xiang Xiao, and Xinyu Zhao. "Polymer Degradation: Category, Mechanism and Development Prospect." E3S Web of Conferences 290 (2021): 01012. http://dx.doi.org/10.1051/e3sconf/202129001012.

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With the increasing demand for polymers, white pollution has become a serious concern all around the world. The admirable degradation methods of them are desirable for overcoming this problem. In the past several decades, numerous researches on polymer degradation have been reported. This review commits to different degradation strategies of polymers and four main degradation protocols firstly, including photodegradation, oxidative degradation, catalytic degradation, and biodegradation, are demonstrated in detail. Secondly, some specific samples are discussed for each kind of degradation. Fina

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BONDARUK, O. M., and L. V. KARABANOVA. "NANOCOMPOSITES BASED ON SINGLECOMPONENT AND MULTICOMPONENT POLYMER MATRICES FOR BIOMEDICAL APPLICATIONS." Polymer journal 44, no. 1 (2022): 3–23. http://dx.doi.org/10.15407/polymerj.44.01.003.

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The review is devoted to analysis of the publications in the area of polymers of biomedical applications. Different types of the polymer matrices for drug delivery are analyzed, including polyurethanes, hydroxyacrylates, and multicomponent polymer matrices, which created by method of interpenetrating polymer networks. Particular attention is paid to description of synthesized and investigated nanocomposites based on polyurethane / poly (2-hydroxyethyl methacrylate) polymer matrix and nanooxides modified by biologically active compounds.

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Pawlak, Andrzej, and Justyna Krajenta. "Progress in Studies of Disentangled Polymers and Composites." Journal of Composites Science 7, no. 12 (2023): 521. http://dx.doi.org/10.3390/jcs7120521.

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Macromolecule entanglements are common in polymers. The first part of this review describes their influence on the properties of entangled polymers. Then, methods for reducing the entanglement density of macromolecule chains are discussed. It has been shown that research on partially disentangled polymers has provided a lot of new information about the relationship between the entangled state and properties of polymers. This research concerns, among others, mechanical and thermal properties and the crystallization process. A special disentangled polymer case, ultra-high-molecular-weight polyet

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21

Romano, Angelo, Ignazio Roppolo, Elisabeth Rossegger, Sandra Schlögl, and Marco Sangermano. "Recent Trends in Applying Ortho-Nitrobenzyl Esters for the Design of Photo-Responsive Polymer Networks." Materials 13, no. 12 (2020): 2777. http://dx.doi.org/10.3390/ma13122777.

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Polymers with light-responsive groups have gained increased attention in the design of functional materials, as they allow changes in polymers properties, on demand, and simply by light exposure. For the synthesis of polymers and polymer networks with photolabile properties, the introduction o-nitrobenzyl alcohol (o-NB) derivatives as light-responsive chromophores has become a convenient and powerful route. Although o-NB groups were successfully exploited in numerous applications, this review pays particular attention to the studies in which they were included as photo-responsive moieties in t

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22

Rymuza, Zygmunt, Zbigniew Kusznierewicz, and Grzegorz Mańturzyk. "Testing miniature, in particular polymer-polymer, journal bearings." Wear 174, no. 1-2 (1994): 39–46. http://dx.doi.org/10.1016/0043-1648(94)90084-1.

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23

Zhang, Tao, Fengxue Liu, Yongxin Liu, et al. "Fluorescent Polymers via Coordination of bis-Terpyridine Ligands with Transition Metals and Their pH Response Properties." Polymers 17, no. 1 (2024): 87. https://doi.org/10.3390/polym17010087.

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Stimulus-responsive luminescent materials are pivotal in the field of sensing. Fluorescent transition metal complexes with a charge transfer excited state, especially terpyridine-coordinated polymers, are of particular interest due to their tunable emission. In this paper, a novel bis-terpyridine ligand was synthesized and assembled into a coordination polymer, which showed intense visible light absorption and fluorescence emission in the solid state that could be regulated by an acidic or basic pH. After being protonated by acid, the fluorescence of the polymer P2 was quenched. The emission o

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Chremos, Alexandros, and Jack F. Douglas. "Influence of Branching on the Configurational and Dynamical Properties of Entangled Polymer Melts." Polymers 11, no. 6 (2019): 1045. http://dx.doi.org/10.3390/polym11061045.

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We probe the influence of branching on the configurational, packing, and density correlation function properties of polymer melts of linear and star polymers, with emphasis on molecular masses larger than the entanglement molecular mass of linear chains. In particular, we calculate the conformational properties of these polymers, such as the hydrodynamic radius R h , packing length p, pair correlation function g ( r ) , and polymer center of mass self-diffusion coefficient, D, with the use of coarse-grained molecular dynamics simulations. Our simulation results reproduce the phenomenology of s

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Brostow, Witold, and Haley E. Hagg Lobland. "Survey of Relations of Chemical Constituents in Polymer-Based Materials with Brittleness and its Associated Properties." Chemistry & Chemical Technology 10, no. 4s (2016): 595–600. http://dx.doi.org/10.23939/chcht10.04si.595.

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The property of brittleness for polymers and polymer-based materials (PBMs) is an important factor in determining the potential uses of a material. Brittleness of polymers may also impact the ease and modes of polymer processing, thereby affecting economy of production. Brittleness of PBMs can be correlated with certain other properties and features of polymers; to name a few, connections to free volume, impact strength, and scratch recovery have been explored. A common thread among all such properties is their relationship to chemical composition and morphology. Through a survey of existing l

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Myshkin, Nikolai K., and Alexander Kovalev. "Polymer mechanics and tribology." Industrial Lubrication and Tribology 70, no. 4 (2018): 764–72. http://dx.doi.org/10.1108/ilt-06-2017-0162.

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Purpose The purpose of this paper is to review the advances in mechanics and tribology of polymers and polymer-based materials. It is focused on the understanding of the correlation of contact mechanics and the tribological behavior of polymers and polymer composites by taking account of surface forces and adhesion in the contact. Design/methodology/approach Mechanical behavior of polymers is considered a viscoelasticity. Tribological performance is estimated while considering the parts of deformation and adhesion in friction arising in the contact. Surface energy, roughness, load and temperat

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27

Chremos, Alexandros, and Ferenc Horkay. "Comparison of neutral and charged polyelectrolyte bottlebrush polymers in dilute salt-free conditions." MRS Advances 5, no. 17 (2020): 899–906. http://dx.doi.org/10.1557/adv.2020.9.

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ABSTRACTWe investigate the structure of neutral and charged bottlebrush polymers in salt-free solutions at different polymer concentrations. In particular, we use molecular dynamics simulations by utilizing a coarse-grained bead-spring model that includes an explicit solvent and complementary experiments made by small angle neutron scattering (SANS). We find that the charged groups along the side chains exert significant repulsive forces, resulting in polymer swelling and backbone stretching. In addition to the primary polyelectrolyte peak, we find that bottlebrush polymers exhibit an addition

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Flemming, Patricia, Alexander S. Münch, Andreas Fery, and Petra Uhlmann. "Constrained thermoresponsive polymers – new insights into fundamentals and applications." Beilstein Journal of Organic Chemistry 17 (August 20, 2021): 2123–63. http://dx.doi.org/10.3762/bjoc.17.138.

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In the last decades, numerous stimuli-responsive polymers have been developed and investigated regarding their switching properties. In particular, thermoresponsive polymers, which form a miscibility gap with the ambient solvent with a lower or upper critical demixing point depending on the temperature, have been intensively studied in solution. For the application of such polymers in novel sensors, drug delivery systems or as multifunctional coatings, they typically have to be transferred into specific arrangements, such as micelles, polymer films or grafted nanoparticles. However, it turns o

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Crespy, Daniel, and Katharina Landfester. "Miniemulsion polymerization as a versatile tool for the synthesis of functionalized polymers." Beilstein Journal of Organic Chemistry 6 (December 1, 2010): 1132–48. http://dx.doi.org/10.3762/bjoc.6.130.

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The miniemulsion technique is a particular case in the family of heterophase polymerizations, which allows the formation of functionalized polymers by polymerization or modification of polymers in stable nanodroplets. We present here an overview of the different polymer syntheses within the miniemulsion droplets as reported in the literature, and of the current trends in the field.

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Hu, Jinming, Ruirui Qiao, Michael R. Whittaker, John F. Quinn, and Thomas P. Davis. "Synthesis of Star Polymers by RAFT Polymerization as Versatile Nanoparticles for Biomedical Applications." Australian Journal of Chemistry 70, no. 11 (2017): 1161. http://dx.doi.org/10.1071/ch17391.

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The precise control of polymer chain architecture has been made possible by developments in polymer synthesis and conjugation chemistry. In particular, the synthesis of polymers in which at least three linear polymeric chains (or arms) are tethered to a central core has yielded a useful category of branched architecture, so-called star polymers. Fabrication of star polymers has traditionally been achieved using either a core-first technique or an arm-first approach. Recently, the ability to couple polymeric chain precursors onto a functionalized core via highly efficient coupling chemistry has

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Tanaka, Tomonari. "Recent Advances in Polymers Bearing Activated Esters for the Synthesis of Glycopolymers by Postpolymerization Modification." Polymers 16, no. 8 (2024): 1100. http://dx.doi.org/10.3390/polym16081100.

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Glycopolymers are functional polymers with saccharide moieties on their side chains and are attractive candidates for biomaterials. Postpolymerization modification can be employed for the synthesis of glycopolymers. Activated esters are useful in various fields, including polymer chemistry and biochemistry, because of their high reactivity and ease of reaction. In particular, the formation of amide bonds caused by the reaction of activated esters with amino groups is of high synthetic chemical value owing to its high selectivity. It has been employed in the synthesis of various functional poly

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Grob, Lucas, Liridon Zeneli, Eileen Ott, et al. "Filter-less separation technique for micronized anthropogenic polymers from artificial seawater." Environmental Science: Water Research & Technology 7, no. 12 (2021): 2372–80. http://dx.doi.org/10.1039/d1ew00553g.

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Anthropogenic polymer particulates (APPs) are a highly researched topic, from the identification of their different sources to their impact on living organisms, and micronized anthropogenic polymers pose a threat to many ecosystems.

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Galuska, Alan A. "Atomic Force Microscopy of Industrial Polymers." Microscopy and Microanalysis 5, S2 (1999): 982–83. http://dx.doi.org/10.1017/s1431927600018237.

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The performance of many industrial polymers is determined by the microscopic morphology of the polymers. For example, surface morphology can influence properties such as adhesion, friction, sealing, blocking, printability, wettability, and haze. Furthermore, bulk morphology often controls mechanical properties such as toughness. strength, wear, and tear resistance. In order to optimize polymer performance, quick reliable methods of determining surface and bulk morphology are essential.In the past, electron microscopy (in particular TEM) has been the primary method for determining polymer morph

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Motoyanagi, Jin, Ayane Fujishima, and Masahiko Minoda. "Controlled Synthesis and Photoresponsive Properties of Spiropyran End-Functionalized Poly(vinyl ether)s." Crystals 12, no. 5 (2022): 742. http://dx.doi.org/10.3390/cryst12050742.

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Due to the need to develop smart materials for a variety of applications such as catalysts and drug delivery, the development of photoresponsive polymers is receiving increasing attention. In particular, the photoisomerization of spiropyran (SP), unlike many other photoresponsive compounds, has attracted attention because it dramatically changes not only the molecular structure but also the polarity of the molecule. However, in most cases where SP is used as a photoresponsive functional group, SP is introduced in the side chain of the polymer, and few cases have been reported in which SP is in

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Arrigo, Rossella, Giulio Malucelli, and Francesco Paolo La Mantia. "Effect of the Elongational Flow on the Morphology and Properties of Polymer Systems: A Brief Review." Polymers 13, no. 20 (2021): 3529. http://dx.doi.org/10.3390/polym13203529.

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Polymer-processing operations with dominating elongational flow have a great relevance, especially in several relevant industrial applications. Film blowing, fiber spinning and foaming are some examples in which the polymer melt is subjected to elongational flow during processing. To gain a thorough knowledge of the material-processing behavior, the evaluation of the rheological properties of the polymers experiencing this kind of flow is fundamental. This paper reviews the main achievements regarding the processing-structure-properties relationships of polymer-based materials processed throug

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Engler, Anthony, Jared Schwartz, and Paul Kohl. "(Student Award, 1st Place, Invited) Rapid Nanometer Scale Patterning Using New High-Sensitivity, Dry-Develop Resists." ECS Meeting Abstracts MA2022-02, no. 18 (2022): 867. http://dx.doi.org/10.1149/ma2022-0218867mtgabs.

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A family of high-resolution, photo-thermal resists based on low ceiling temperature copolymers has been developed and used in a nanometer scale, direct-write thermal patterning tool. The polymer resists are composed of cyclic, low ceiling temperature (Tc) poly(aldehydes). Tc is the thermodynamic temperature which separates polymer from monomer. The Tc of the polymers is below room temperature making the polymer meta-stable at room temperature. The resists very rapidly and cleanly decompose into monomer only when triggered during patterning because the mechanism of depolymerization is suppresse

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Klimenko, O. N., M. I. Valueva, and A. N. Rybnikova. "POLYMERS AND POLYMER COMPOSITES IN SPORT (review)." Proceedings of VIAM, no. 10 (2020): 81–89. http://dx.doi.org/10.18577/2307-6046-2020-0-10-81-89.

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Рrovides an overview of scientific and technical information – Russian and foreign periodicals, patents for inventions – in the field of the use of polymeric materials in the sports industry and sports infrastructure. Data on world manufacturers, applied technologies, Russian developments in this direction are presented, examples of the practical use of polymeric materialsin the sports industry are shown. Special attention is paid to polymer composite materials,in particular, based on carbon fibers.

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Nadareishvili, Levan, Roland Bakuradze, Jimsher Aneli, et al. "Method and Mathematical Modeling of Formation of Gradually and Homogeneously Oriented Linear Polymers." International Journal of Polymer Science 2019 (November 25, 2019): 1–11. http://dx.doi.org/10.1155/2019/8132518.

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Previously, we developed several technical solutions for the conversion of isotropic polymers into materials of a new type—gradually oriented polymers with a gradient of physical and mechanical properties, thereby materializing for the first time the unused possibilities inherent in the polymeric nature of the substance. The scientific basis of these developments is the concept of a new structural state of linear polymers—a gradually oriented (stretched) state (GOS), the essence of which is set out briefly. An algorithm and a mathematical model for controlling the process of uniaxial, zonal st

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Trhlíková, Olga, Sviatoslav Hladyš, Jan Sedláček та Dmitrij Bondarev. "SEC-DAD - Effective Method for the Characterization of π-Conjugated Polymers". Materials Science Forum 851 (квітень 2016): 167–72. http://dx.doi.org/10.4028/www.scientific.net/msf.851.167.

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In the article we present a unique analytical tool for the characterization of conjugated polymers – SEC-DAD (Size Exclusion Chromatography – Diode Array Detector). The chromatographic separation is performed in a conventional SEC mode which provides narrow molecular-weight fractions of the analyzed polymer. The uniqueness of the SEC-DAD combination comes out with the utilization of DAD for the monitoring the absorption characteristics of particular fractions along the molecular weight distribution. If applied in the characterization of the conjugated polymers, SEC-DAD helps to reveal the depe

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Głuszewski, Wojciech, Andrzej Stasiek, Aneta Raszkowska-Kaczor, and Daniel Kaczor. "Effect of polyethylene cross-linking on properties of foams." Nukleonika 63, no. 3 (2018): 81–85. http://dx.doi.org/10.2478/nuka-2018-0010.

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Abstract The process of cross-linking of polyethylene using gamma radiation (γ) and electron beam (EB) was tested from the point of view of density of foam. Particular attention was paid to the postradiation oxidation effect of the polymers. The study used two types of radiation sources of varying dose rates: gamma radiation (4 kGy/h) and EB (14 000 kGy/h). Radiolysis studies of the polymers used the radiation yield of hydrogen evolved (GH2, approximately proportional to the number of radicals) and radiation yield of oxygen absorbed by the polymer (GO2). Oxidation of polymer due to radiation w

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Tawade, Pratik, Nimisha Tondapurkar, and Akash Jangale. "Biodegradable and biocompatible synthetic polymers for applications in bone and muscle tissue engineering." Journal of Medical Science 91, no. 3 (2022): e712. http://dx.doi.org/10.20883/medical.e712.

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Abstract (sommario):

In medicine, tissue engineering has made significant advances. Using tissue engineering techniques, transplant treatments result in less donor site morbidity and need fewer surgeries overall. It is now possible to create cell-supporting scaffolds that degrade as new tissue grows on them, replacing them until complete body function is restored. Synthetic polymers have been a significant area of study for biodegradable scaffolds due to their ability to provide customizable biodegradable and mechanical features as well as a low immunogenic effect due to biocompatibility. The food and drug adminis

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Chrószcz-Porębska, Marta, and Agnieszka Gadomska-Gajadhur. "Cysteine Conjugation: An Approach to Obtain Polymers with Enhanced Muco- and Tissue Adhesion." International Journal of Molecular Sciences 25, no. 22 (2024): 12177. http://dx.doi.org/10.3390/ijms252212177.

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The modification of polymers towards increasing their biocompatibility gathers the attention of scientists worldwide. Several strategies are used in this field, among which chemical post-polymerization modification has recently been the most explored. Particular attention revolves around polymer-L-cysteine (Cys) conjugates. Cys, a natural amino acid, contains reactive thiol, amine, and carboxyl moieties, allowing hydrogen bond formation and improved tissue adhesion when conjugated to polymers. Conjugation of Cys and its derivatives to polymers has been examined mostly for hyaluronic acid, chit

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Shemwell, Brooke E., and Yiannis A. Levendis. "Particulates Generated from Combustion of Polymers (Plastics)." Journal of the Air & Waste Management Association 50, no. 1 (2000): 94–102. http://dx.doi.org/10.1080/10473289.2000.10463994.

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González-Henríquez, Carmen, Mauricio Sarabia-Vallejos, and Juan Rodríguez Hernandez. "Antimicrobial Polymers for Additive Manufacturing." International Journal of Molecular Sciences 20, no. 5 (2019): 1210. http://dx.doi.org/10.3390/ijms20051210.

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Three-dimensional (3D) printing technologies can be widely used for producing detailed geometries based on individual and particular demands. Some applications are related to the production of personalized devices, implants (orthopedic and dental), drug dosage forms (antibacterial, immunosuppressive, anti-inflammatory, etc.), or 3D implants that contain active pharmaceutical treatments, which favor cellular proliferation and tissue regeneration. This review is focused on the generation of 3D printed polymer-based objects that present antibacterial properties. Two main different alternatives of

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Bao, Yinyin. "Controlling Molecular Aggregation-Induced Emission by Controlled Polymerization." Molecules 26, no. 20 (2021): 6267. http://dx.doi.org/10.3390/molecules26206267.

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In last twenty years, the significant development of AIE materials has been witnessed. A number of small molecules, polymers and composites with AIE activity have been synthesized, with some of these exhibiting great potential in optoelectronics and biomedical applications. Compared to AIE small molecules, macromolecular systems—especially well-defined AIE polymers—have been studied relatively less. Controlled polymerization methods provide the efficient synthesis of well-defined AIE polymers with varied monomers, tunable chain lengths and narrow dispersity. In particular, the preparation of s

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Zhang, Huiqi. "Reprocessable Photodeformable Azobenzene Polymers." Molecules 26, no. 15 (2021): 4455. http://dx.doi.org/10.3390/molecules26154455.

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Abstract (sommario):

Photodeformable azobenzene (azo) polymers are a class of smart polymers that can efficiently convert light energy into mechanical power, holding great promise in various photoactuating applications. They are typically of crosslinked polymer networks with highly oriented azo mesogens embedded inside. Upon exposure to the light of appropriate wavelength, they experience dramatic order parameter change following the configuration change of the azo units. This could result in the generation and accumulation of the gradient microscopic photomechanical force in the crosslinked polymer networks, thus

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Makino, Akira, and Shunsaku Kimura. "Solid Tumor-Targeting Theranostic Polymer Nanoparticle in Nuclear Medicinal Fields." Scientific World Journal 2014 (2014): 1–12. http://dx.doi.org/10.1155/2014/424513.

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Abstract (sommario):

Polymer nanoparticles can be prepared by self-assembling of amphiphilic polymers, and various types of molecular assemblies have been reported. In particular, in medicinal fields, utilization of these polymer nanoparticles as carriers for drug delivery system (DDS) has been actively tried, and some nanoparticulate drugs are currently under preclinical evaluations. A radionuclide is an unstable nucleus and decays with emission of radioactive rays, which can be utilized as a tracer in the diagnostic imaging systems of PET and SPECT and also in therapeutic purposes. Since polymer nanoparticles ca

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Kim, Junho, Eui Hyun Suh, Kyumin Lee, et al. "Development of Alkylthiazole-Based Novel Thermoelectric Conjugated Polymers for Facile Organic Doping." Nanomaterials 13, no. 7 (2023): 1286. http://dx.doi.org/10.3390/nano13071286.

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Abstract (sommario):

In this study, we developed two novel conjugated polymers that can easily be doped with F4TCNQ organic dopants using a sequential doping method and then studied their organic thermoelectric (OTE) properties. In particular, to promote the intermolecular ordering of OTE polymers in the presence of the F4TCNQ dopant, alkylthiazole-based conjugated building blocks with highly planar backbone structures were synthesized and copolymerized. All polymers showed strong molecular ordering and edge-on orientation in the film state, even in the presence of the F4TCNQ organic dopant. Thus, the sequential d

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Weis, Martin. "Organic Semiconducting Polymers in Photonic Devices: From Fundamental Properties to Emerging Applications." Applied Sciences 15, no. 7 (2025): 4028. https://doi.org/10.3390/app15074028.

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Abstract (sommario):

This review examines the distinct advantages of organic semiconductors over conventional insulating polymers as optically active materials in photonic applications. We analyze the fundamental principles governing their unique optical and electronic properties, from basic conjugated polymer systems to advanced molecular architectures. The review systematically explores key material classes, including polyfluorenes, polyphenylene vinylenes, and polythiophenes, highlighting their dual electrical–optical functionality unavailable in passive polymer systems. Particular attention is given to polymer

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Farahpour, Farnoush, Mohammad Reza Ejtehadi, and Fathollah Varnik. "Polyelectrolytes polarization in nonuniform electric fields." International Journal of Modern Physics C 25, no. 12 (2014): 1441010. http://dx.doi.org/10.1142/s0129183114410101.

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Abstract (sommario):

Stretching dynamics of polymers in microfluidics is of particular interest for polymer scientists. As a charged polymer, a polyelectrolyte (PE) can be deformed from its coiled equilibrium configuration to an extended chain by applying uniform or nonuniform electric fields. By means of hybrid lattice Boltzmann (LB)-molecular dynamics (MD) simulations, we investigate how the condensed counterions (CIs) around the PE contribute to the polymer stretching in inhomogeneous fields. As an application, we discuss the translocation phenomena and entropic traps, when the driving force is an applied exter

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