bluuebunny/crossref_metadata_2025_split huggingface dataset:
Compatibilization of Polymer Blends under Conditions of High Pressure and Shear Deformation
Authors: Hosseinnezhad Ramin , Vozniak Iurii , Rozanski Artur , Kulagin Roman , Beloshenko Victor , Galeski Andrzej 
Published: August 2024

AbstractStructural changes in polylactide/polybutylene terephthalate (PLA/PBT) and glycol‐modified polyethylene terephthalate/polybutylene terephthalate (PET‐G/PBT) polymer blends at a pressure of 1 GPa and room temperature in combination with shear deformation are investigated. High pressure torsion (HPT) is chosen as the compatibilization technique. Based on solid‐state NMR data, it is found that the compatibility of immiscible polymers is significantly improved under high pressure conditions in combination with shear deformation. It is assumed that the thickness of the deformed polymer layers decreases to the thickness of the interphase and it can be a fully interphase material.
Multiple‐Shape Memory Polymer Blends Formed by Massive Formation of Interphases via Ultrahigh Plastic Deformation
Authors: Vozniak Alina , Galeski Andrzej , Kulagin Roman , Beloshenko Victor , Vozniak Andrei , Savchenko Bohdan 
Published: August 2024

AbstractThe development of advanced shape memory polymers (SMPs) requires the creation of approaches that offer the possibility of forming different temporal shapes as well as changing the corresponding shape memory transition temperatures. A distinctive feature of ultrahigh plastic deformation methods is the possibility of producing polymer blends with a maximum content of interface to form a single broad thermal transition. This can be an attractive way to produce multi‐SMPs based on a simple processing technique. Two polymer pairs—glycol‐modified polyethylene terephthalate/polylactide (PETG/PLA), glycol‐modified polyethylene terephthalate/polybutylene terephthalate (PETG/PBT)—are used to form an immiscible symmetrical blend (50 wt%/50 wt%). Ultrahigh plastic deformation is achieved by high pressure torsion (HPT). HPT leads to intimate mixing of the chains of the respective polymer pairs. Thermomechanical programming successfully enables a triple shape memory effect with fine shape memory parameters.
Estimating Network Lifetime of AUN in Photo‐Aging by Kinetic Modeling and “Degelation” Model
Authors: Ishida Takato , Richaud Emmanuel , Hagihara Hideaki , Kitagaki Ryoma 
Published: August 2024

AbstractThe study develops an oxidative kinetic model of acrylic‐urethane network during photo‐aging. The kinetic model can track chemical reaction dynamics well and also enables to estimate the network lifetime by counting scission/crosslinking events. Estimated network lifetime is semiquantitively coincided with the one derived from different statistical approach.
Filling Fresh Metakaolin‐Based Geopolymer Paste with Wood Ash: Chemical and Mechanical Characterization
Authors: Catauro Michelina , Viola Veronica , D'Amore Alberto 
Published: August 2024

AbstractWood ash is the powdery residue remaining after wood combustion. Today, only some of the wood ashes are recycled, while most are disposed of in landfills. Increasing recycled wood ash can limit environmental damage and save transportation costs and waste disposal. This paper presents including 10% of wood ashes as a filler material for geopolymers. The ashes, coming from a local Italian restaurant, are sieved between 65 and 79 µm and are incorporated into a metakaolin‐based geopolymer matrix, cured at room temperature (25 °C). Ionic conductivity, pH, and Infrared Spectroscopy analysis, conducted after 7, 14, 28, and 56 days of curing time, reveal the occurrence of the geopolymerization process. Furthermore, the mechanical strength results allow the comparison of these materials with Portland cement, one of the most common polluting competitors.
Toughened CFRPs via PEO Nanofibers: Effect of Water Ageing on Delamination
Authors: Maccaferri Emanuele , Ortolani Jacopo , Mazzocchetti Laura , Benelli Tiziana , Brugo Tommaso Maria , Zucchelli Andrea , Giorgini Loris 
Published: August 2024

AbstractDelamination is a common failure mechanism affecting composite laminates. Thermoplastic poly(ethylene oxide) (PEO) nanofibers are recently proposed for toughening carbon fiber reinforced polymers (CFRPs), obtaining promising results. In the present work, PEO‐modified epoxy CFRPs underwent ageing in water for 1 month, and the interlaminar properties are assessed via double cantilever beam (DCB) and end‐notched flexure (ENF) tests. The Mode I delamination behavior of both PEO‐modified and unmodified commercial composite plates is compared. Water ageing slightly affects the mechanical properties of the nano‐modified laminates, though the interleaved nano‐reinforcement is water‐soluble. The achieved results are very encouraging and pave the way to the use of PEO nanofibrous mats for hindering delamination in composite laminates.
Flaw Detection by SHM with Static Sensors Approach: State of the Art and Perspectives
Authors: D'Amore Alberto , Grassia Luigi , Iannone Michele 
Published: August 2024

AbstractStructural health monitoring (SHM) is a technology aimed to monitor the soundness of the structures. Applications for aircraft structures are largely investigated. The goal is to utilize the information acquired during the monitoring to save maintenance costs, improve flight safety, and design lighter structures. Different issues, like load monitoring and impact detection, are investigated by SHM research. The most largely investigated issue is damage detection, i.e., developing a system that utilizes sensors to detect the damage in the structure. Damage detection can be performed with two sensors: dynamic and static. Dynamic sensors work by transmission of waves through the structures. Defects are identified by deviation and reflection of the waves by damages. The SHM approach described in this work is based on static sensors, like strain gages or fiber optics. The strain fields under load in pristine and damaged conditions are compared; the evaluation of the change in the strain field identifies damages. Two different algorithms for damage detection have been developed and patented in Leonardo Aircraft and are described in this work; they are based on the reverse finite element model (FEM) and neural network. The issues related to the strain field measurement are also briefly described.
Synthesis of Composite Hydrogels for Enhanced Oil Recovery
Authors: Gizatullina Nargiz N. , Yelemessova Gulnur T. , Klivenko Alexey N. , Shakhvorostov Alexey V. 
Published: August 2024

AbstractComposite hydrogels (CH) based on acrylamide (AAm), sodium acrylate (SA), and bentonite are prepared via free radical polymerization in the presence of cross‐linking agent—N,N‐methylene bisacrylamide (MBAA). As a result, a series of preformed particle gels (PPG) with different compositions are obtained. The CH is characterized by FTIR, mechanical analysis. The swelling behavior of CH is determined in water and brine water with different salinity. The influence of the monomer concentration, ratio of bentonite/monomers, on mechanical properties, and swelling degree of CH are studied.
Novel Supercapacitor Based on Pedot:PSS/Graphene Oxide Nanocomposite
Authors: Greco Giuseppe , Giuri Antonella , Bagheri Sonia , Rizzo Aurora , Mele Claudio , Corcione Carola Esposito 
Published: August 2024

AbstractOver the last few years, graphene oxide (GO) has stood out as an ideal carbon‐filler to dope polymer matrix, specifically conductive polymers. This paper investigates the possibility of producing ternary nanocomposites based on a conductive polymer poly(3,4 ethylene dioxythiophene) polystyrene sulfonate (PEDOT:PSS), doped with graphene oxide (GO) and is additivated with a green dispersing and reducing agent (ascorbic acid). Three‐component inks have been developed and their rheological and surface tension properties are studied to evaluate their filmability. Subsequently, through the drop‐casting technique, thin films of the inks are produced, and their electrochemical behavior is deeply analyzed via cyclic voltammetry tests (CV). Particularly, PEDOT:PSS/GO/AA ink shows a higher specific capacitance (Csp) up to 29.84 mF cm−2 than pristine PEDOT:PSS, suggesting that this ink can be used as an electrode material for supercapacitor devices.
Fractionation and Characterization of Commercial Low Acyl Gellan Gum
Authors: Tatykhanova Gulnur S. , Hirvonen Sami‐Pekka , Bardadym Yuliia V. , Gizatullina Nargiz N. , Saulimbay Moldir A. 
Published: August 2024

AbstractCommercial low acyl gellan (LAG) is purified by the fractional dissolution method. An aqueous solution of purified commercial LAG exhibits polyelectrolyte character due to its high molar mass and carboxylic groups in glucuronic acid fragments. The empirical Fuoss equation determines the intrinsic viscosity of purified LAG in salt‐less water. Fractionation of commercial LAG is carried out by ultrasound treatment. LAG fractions are characterized by 1H NMR and FTIR spectroscopy. The intrinsic viscosities of ultrasonically treated LAG samples are measured in 0.025 m of tetramethylammonium chloride (TMACl). The molecular weights of LAG fractions are determined by the Mark–Kuhn–Houwink equation.
Comparative Study of Gellan Gum Derived from Domestic Raw Materials of Kazakhstan and Commercial Gellan
Authors: Tatykhanova Gulnur S. , Gizatullina Nargiz N. , Kudaibergenova Gulnar M. , Berzhanova Ramza Zh. , Mukasheva Togzhan D. , Kudaibergenov Sarkyt E. 
Published: August 2024

AbstractGellan gum prepared from the domestic raw materials of Kazakhstan is studied by methods of 1H NMR spectroscopy, FTIR, GPC, TGA, and compared with characteristics of commercial gellan gum. Fermentation on glucose‐fructose syrup of Zharkent and Burunday corn starch plants (Kazakhstan) by Sphingomonas paucimobilis ATCC 31461 produces a biomass containing a high acyl gellan gum (HAG). The average molecular weights, Mw, Mn, Mz, and polydispersity index (PDI) of HAG are determined by GPC. Low acyl gellan (LAG) is obtained by treatment of HAG with alkaline solution. It is shown that the spectral and thermal characteristics of HAG and LAG produced from the glucose‐fructose syrup and commercial gellan gum are similar.
Control of 3D Printing Parameters to Design the Response of Heating Polymers
Authors: Guadagno Liberata , Longo Raffaele , Raimondo Marialuigia , Pantani Roberto , Sorrentino Andrea , Vertuccio Luigi , Catauro Michelina , Aliberti Francesca 
Published: August 2024

AbstractAdditive manufacturing (AM) is an innovative production process that allows for designing objects with self‐responsive properties exploiting the potentialities of nanotechnologies. In this context, acrylonitrile butadiene styrene (ABS) filled with multi‐walled carbon nanotubes (MWCNT) is printed via fusion deposition modeling (FDM) by setting two different printing directions, 0° and 90°. The investigation of the electrical properties of 3D printed parts demonstrates that the printing direction affects the pathway of electrical current flow and, consequently, the heating performance. A suitable setting of the raster angle allows the alignment of the carbon nanotubes along the printing direction. This alignment, verified through morphological investigations, strongly influences the heating properties due to the Joule effect.
Solid‐State Processing of Nascent Disentangled UHMWPE Reactor Powders Mixed with Carbon Nanoparticles
Authors: Lebedev Oleg V. , Tikunova Ekaterina P. , Golubev Evgeny K. , Kurkin Tikhon S. , Shevchenko Vitaly G. , Ozerin Alexander N. 
Published: August 2024

AbstractAspects of solid‐state processing of nascent disentangled ultra‐high‐molecular‐weight polyethylene (UHMWPE) powders of different syntheses mixed with electrically conductive carbon nanoparticles (NPs) of various types are studied. Effect of multiple parameters of the processing procedures on the electrophysical characteristics of the composite samples is investigated. Such parameters include time of preliminary ultrasonication (US) of NPs, time of US of UHMWPE/NPs mixtures, molding time, temperature, and pressure, deformation degree, etc. It is observed that by selecting optimal values of such parameters it is possible to obtain samples of composites with an extremely segregated structure made of the NPs, with NPs distributed evenly on the surfaces of the compacted UHMWPE powder particles. This ensures high levels of conductivity at very low values of NPs content. The segregated structure is retained when the composites are strengthened using the solid‐state uniaxial shear deformation process. While conductivity of most of the composites filled with various types of NPs monotonously decreases with the deformation ratio, conductivity of the composites filled with exceptionally long double‐walled carbon nanotubes is maintained. The processed oriented composites are also characterized by high EMR shielding properties, as well as interesting temperature dependencies of the electrical conductivity.
Rubber Containing Nanofibers and Their Ability in Structural Modification of CFRPs: A Summary
Authors: Maccaferri Emanuele , Ortolani Jacopo , Benelli Tiziana , Brugo Tommaso Maria , Zucchelli Andrea , Giorgini Loris , Mazzocchetti Laura 
Published: August 2024

AbstractRubber containing nanofiber is investigated as structural modifiers of carbon fiber reinforced polymers (CFRPs) to improve their delamination resistance. The ability to obtain long lasting nanofibrous shape from liquid nitrile butadiene rubber (NBR) has been demonstrated even without requiring instant cross‐linking when a second component is used together with NBR in the process. The second component can be a thermoplastic which either melts, such as poly(e‐caprolactone) (PCL), or holds steady, as poly(m‐phenylene isophthalamide) (PMIA) or nylon 66, during CFRP curing process. Assuming that NBR is not crosslinked, during curing of low Tm thermoplastic‐based rubber nanofibers, their morphology is lost, as for NBR/PCL, and both polymers blend with the surrounding epoxy resin thus leading to an outstanding toughening effect, but at the cost of the overall composite mechanical performance. When a second component is used which is preserved in nanofibrous fashion during curing (NBR/PMIA, NBR/nylon 66), instead, a good compromise is achieved, with still outstanding delamination hindering ability, together with almost fully preserved thermo‐mechanical performances.
Conductivity of Diblock Copolymer System Filled with Conductive Fillers
Authors: Chervanyov Alexander I. 
Published: August 2024

AbstractThe electrical response of the insulating diblock copolymer system (DBC) filled with conductive spherical fillers is investigated to the variation of the following factors: i) composite temperature; ii) affinities of fillers for copolymer blocks; iii) interaction between fillers. By performing the consistent phase‐field and Monte‐Carlo simulations of the filled DBC system, this article quantitatively demonstrates that the distribution of fillers in DBC essentially depends on the complicated interplay of the above three factors. The obtained distribution of filler particles, in turn, proves to be directly related to the electrical response of the DBC‐particle composite, calculated by the developed model. In particular, the order‐disorder transition in the DBC system has been found to co‐occur with the insulator‐conductor transition in the filler network providing a sufficient difference between the affinities of fillers for dissimilar DBC blocks. The order–order transition between the lamella and cylindrical morphologies of DBC has been found to cause a spike in the composite conductivity.
Evaluation of the Effect of Recycling of Carbon Fibers for Polypropylene Reinforcement
Authors: Giorgini Loris , Natali Paola , Sisti Laura , Vannini Micaela , Maccaferri Emanuele , Benelli Tiziana , Mazzocchetti Laura 
Published: August 2024

AbstractThe recycling of carbon fibers (CFs) from composites is becoming a necessity, with a gain both from economic and environmental point of views because carbon fibers are a high value‐added material and the energy requirement for their production is pretty high. The use of such recycled fibers needs to find reliable applications to fully close the circular economic loop and here it is demonstrated that their applications as short fiber reinforcement in thermoplastics are not only convenient but as reliable as prostin fibers. This work wants to evaluate the effect of the recycling and reprocessing recycled carbon fibers versus pristine fibers, when inserted in polyprolylene (PP), in the presence of different amounts of compatibilizer to promote a better fiber/matrix interaction.
Novel Hemp‐Based Biopolymers Plasticized with Spermidine and/or Glycerol
Authors: Mirpoor Seyedeh Fatemeh 
Published: August 2024

AbstractThis work investigates the effects of spermidine (SPD) on the properties of hemp‐based biopolymers developed in the absence or presence of glycerol (GLY). The mechanical properties of the biopolymer show that the tensile strength and Young's module significantly increase when the film is prepared with SPD alone (10 mm). However, the GLY plasticized films with the same concentration of 10 mm SPD have the highest elongation at break compared to the other films. The film moisture content, water solubility, and swelling ratio improve by the incorporation of SPD, resulting in the development of more hydrophobic biopolymers. However, the hydrophobicity and barrier properties to gases and water vapor of the biopolymers are higher when prepared with SPD alone.
3D Printed Watch Straps Manufactured with TPU Materials and the Influence of Infill Printing Characteristics on the Mechanical Tensile Behaviors
Authors: Braileanu Patricia Isabela , Pascu Nicoleta Elisabeta , Dobrescu Tiberiu Gabriel , Jiga Gabriel Gheorghe 
Published: August 2024

AbstractWrist watches have accompanied people in the most important moments since the 1810s and have undergone an esthetic and mechanical transformation process to align with safety standards and regulations depending on the destination of each type of wrist watch. This article aims to determine the influence of the filling percentage and the most common filling geometry pattern on the mechanical tensile behavior of a watch bracelet model manufactured from flexible filament. The comparative study is carried out on samples with two different filling percentages, manufactured by using the FDM technology from a thermoplastic material polyether‐polyurethane elastomer (TPU) with a hardness scale of 82A and thermoplastic elastomer (TPU) with a hardness scale of 93A, these being subsequently subjected to two‐direction traction tests with the aim of determining the braking strap models resistance depending on the material hardness, thus, creating the prerequisites for finding a solution to increase the durability of the custom made watch straps from TPU through FDM technology.
Morphological and Mechanical Characterization of Polyamide 11/Sepiolite Nanocomposites
Authors: Fares Sofia , Dehouche Nadjet , Kaci Mustapha 
Published: August 2024

AbstractThe objective of the paper is to investigate the effect of organo‐modified sepiolite (MSep) on morphology, mechanical, and viscoelastic properties of polyamide‐11 (PA11) prepared by melt compounding at 5 wt.%. The study reveals that the addition of both unmodified sepiolite (USep) and organo‐MSep to PA11 improves the reinforcement effect of the nanocomposite materials compared to neat PA11, being however more pronounced for the organo‐modified one. Indeed, morphological analysis by transmission electron microscopy (TEM) shows a finer dispersion of organo‐MSep in PA11 matrix than the unmodified one, which is characterized by a significant presence of fibers aggregates in number and size. Further, dynamic mechanical analysis (DMA) results are in a good agreement with both tensile properties and TEM observations.
Study of the Behavior of 3D Printed Thermoplastic Elastomers Structures Aimed at Emulating Traditional Polyurethane Foams
Authors: Natali Paola , Mazzocchetti Laura , Bertoldo Denis , Campari Enrico Gianfranco , Benelli Tiziana , Maccaferri Emanuele , Giani Niccolò , Giorgini Loris 
Published: August 2024

AbstractThe present paper introduces a preliminary analysis and the recent development of three‐dimensional (3D) printed thermoplastic polyurethane (TPE‐U) as a replacement of polyurethane (PU) foams that has led to a recyclable product. Among the various 3D printing techniques available, the team focuses on Fused Deposition Modeling (FDM) because of its simplicity, affordability, and versatility in printing geometries and recyclability of materials. Four thermoplastic polyurethane (TPU) elastomers with different stiffness (in the range of Shore A) are used. Therefore, through the combination of different printing geometries, modulation of the main printing parameters, and different materials, an attempt is made to simulate the mechanical behavior of PU foams, which are commonly used for the production of paddings. The mechanical evaluation, by means of dynamic mechanical analysis (DMA), of the of 3D printed specimens has highlighted a qualitatively different and potentially superior behavior with respect to that of PU foam.
AFM Investigation as a Key Analysis to Determine the Drug Location in Electrospun Drug Delivery Systems
Authors: Guadagno Liberata , Raimondo Marialuigia , Vertuccio Luigi , Ciardulli Maria Camilla , Sirignano Marco , Mariconda Annaluisa , Porta Giovanna Della , Longo Raffaele 
Published: August 2024

AbstractThe current study analyzes the possibility of determining the drug location in electrospun polymeric matrices and forecasting the release kinetics of drug delivery systems. Electrospun membranes made of polycaprolactone (PCL) loaded with dacarbazine (the drug of choice for the treatment of melanoma) and with AuM1 (a promising synthetic Au‐based complex recently proposed for antitumoral treatments) are successfully prepared. Atomic force microscopy (AFM) analysis is performed on various membranes, highlighting the relevance of investigating the three‐dimensional topology of the membranes for understanding the release kinetic. The produced mats are similar for all membranes, but significant differences in the microscopic roughness wall between the systems loaded with AuM1 and dacarbazine are observed.For AuM1, which has a low affinity with the PCL matrix, the complex aggregates on the nanofibers’ external walls, consequently increasing the roughness and causing a high burst in the first hours of release. On the other hand, dacarbazine is successfully included in the bulk core of the PCL nanofibers. Thus, the release kinetics is diffusive and well described by the Fick model.
3D Extrusion and Stereolithography Printing Methods for Producing Multifunctional Polymer Composites
Authors: Tamburri Emanuela , Montaina Luca , Pescosolido Francesca , Carcione Rocco , Battistoni Silvia 
Published: August 2024

AbstractThis study presents a short overview of the main 3D polymer composite items that are fabricated by extrusion and stereolithography printing. By coupling polymers traditionally used in additive manufacturing, such as PEGDA, and polymers of biomedical interest, such as PVA, with carbon nanostructures, such as nanodiamond and graphene nanoplates, and conductive polymers, such as PEDOT and PANI, it has been possible to produce objects with specific functional properties exploited for fabricating scaffolds for cell growth and proliferation as well as soft electrodes for developing organic compounds sensing devices and electrocardiogram monitoring systems under real‐time conditions.