Article
Materials Science, Multidisciplinary
Mahmoud I. Abbas, Mona M. Gouda, Sarah N. EL-Shimy, Mirvat F. Dib, Hala M. Abdellatif, Raqwana Baharoon, Mohamed Elsafi, Ahmed M. El-Khatib
Summary: This study investigates the enhancement of shielding properties of bentonite by adding barite and nanosized bismuth oxide particles. The results show that the addition of bismuth oxide reduces the transmitted flux, increases the linear attenuation coefficient, and improves the material's density, leading to improved radiation shielding performance.
Article
Mechanics
Lorenzo Lombardi, Daniele Tammaro
Summary: The study explored the effect of die swell on extrusion foam of thermoplastic polymers, revealing a close link between die swell and foaming during the extrusion process. The anisotropic expansion of foam was found to be strongly affected by die swell, which significantly impacts the shape and density of the final product.
Article
Polymer Science
Jose Luis Valin Rivera, Cristian Rodolfo Valenzuela Reyes, Arturo Andres Quinteros Wachtendorff, Angel Rodriguez Soto, Meyli Valin Fernandez, Roberto Iquilio Abarzua, Alvaro Gonzalez Ortega, Gilberto Garcia del Pino, Francisco Rolando Valenzuela Diaz
Summary: This study investigates the mechanical properties of composite materials comprising a polyester resin with sisal fiber and bentonite particles. The results show that the addition of bentonite affects the tensile strength, while the addition of sisal fiber improves the flexural strength and elastic modulus.
Article
Chemistry, Physical
Tao Wu, Zhengye Feng, Zilong Geng, Minhong Xu, Qiang Shen
Summary: The diffusion of Re(VII) and Se(IV) in bentonite can be restricted by the formation of barite precipitates. The effective diffusion coefficient of these radionuclides decreases with the increase of barite precipitates. The formation of high amounts of barite precipitates can completely stop the diffusive flux.
APPLIED CLAY SCIENCE
(2023)
Article
Polymer Science
Krzysztof Wilczynski, Kamila Buziak, Adrian Lewandowski, Andrzej Nastaj, Krzysztof J. Wilczynski
Summary: The study conducted extensive rheological and extrusion modeling on wood polymer composites based on the polypropylene matrix, investigating their unique flow properties and slip effects. Through numerical simulations and experimental validation, it was concluded that the location of the operating point in the extrusion process fundamentally depends on the material's rheological characteristics.
Article
Polymer Science
Fanny Casteran, Karim Delage, Nicolas Hascoet, Amine Ammar, Francisco Chinesta, Philippe Cassagnau
Summary: This article investigates two main problems: the controlled thermo-mechanical degradation of polyethylene using the extrusion process for recycling applications, and the data-based modelling of reactive extrusion processes. The study utilizes experiments, numerical methods, and machine learning techniques to address these issues and successfully predicts process outputs and material characteristics.
Article
Nanoscience & Nanotechnology
Alinda Oyku Akar, Umit Hakan Yildiz, Umit Tayfun
Summary: Polyamide 6 (PA) matrix was reinforced with different concentrations of Na-activated bentonite, amino functional silane treated bentonite, and organo-modified clays. Mechanical test results showed slight improvements in tensile strength and modulus parameters with filler additions to the PA matrix. Silane treated BNT exhibited better mechanical results compared to Na-activated bentonite additions. Thermal studies indicated that the inclusion of clay into the polymer matrix shifted the decomposition and melting temperatures of PA to higher values._organo-clay and bentonite additions with lower filling ratios enhanced the mechanical and thermal performance of polyamide.
REVIEWS ON ADVANCED MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Salma Ali Madkour, Seha Tirkes, Umit Tayfun
Summary: The addition of BRT can enhance the tensile strength and hardness of ABS, but decrease its impact energy. Furthermore, BRT inclusion can increase the storage modulus of ABS, while having little effect on the MFI parameter. BRT particles disperse more homogeneously in the ABS phase at lower contents, with the 10% filling ratio yielding the best performance among ABS composites.
APPLIED SURFACE SCIENCE ADVANCES
(2021)
Review
Polymer Science
Antonio Benjamim Mapossa, Afonso Henrique da Silva Junior, Carlos Rafael Silva de Oliveira, Washington Mhike
Summary: The extensive use of non-biodegradable plastic products has caused significant environmental issues. Biodegradable polymers offer a solution but face challenges, which researchers are addressing by incorporating bentonite clay into polymeric matrices. However, achieving complete dispersion of nanoclays remains a challenge. Various methods are used to prepare polymer-clay nanocomposites for versatile industrial applications. Combining bentonite clay with other fillers can reduce production costs. This work reviews the development, challenges, and future directions of bentonite clay-based composites with biodegradable polymers.
Article
Chemistry, Multidisciplinary
Tatyana Nikonova, Lukasz Gierz, Olga Zharkevich, Essim Dandybaev, Murat Baimuldin, Leonid Daich, Andrey Sichkarenko, Evgeniy Kotov
Summary: This article explains the process and features of operating an extrusion line for producing polypropylene film for sleeves. It covers the advantages and disadvantages of the technology and structure of the extrusion line, as well as the stages and parameters involved in polymer sleeves production. The article also discusses the quality characteristics of the film and the various factors that influence its properties, including temperature control automation.
APPLIED SCIENCES-BASEL
(2022)
Article
Nanoscience & Nanotechnology
Wenrui Zhang, Yiding Wang, Hongling Sun, Chuntai Liu, Changyu Shen, Xianhu Liu
Summary: In this study, high-density polyethylene/boron nitride (HDPE/BN) composites with high thermal conductivity were prepared. These composites exhibit strong sunlight reflectivity (>86%) and emissivity (>93%) at the atmospheric window band (8-13 μm). They can achieve subambient cooling capacity of about 4-6 °C below ambient temperature in direct sunlight, making them suitable for electronic devices and building radiative cooling applications. Simulation using Energy Plus building energy software showed potential cooling energy savings of 5-11 MJ m(-2) per year, accounting for about 8-20% of the annual cooling energy consumption for these buildings.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2023)
Article
Polymer Science
Dylan Jubinville, Guowei Chen, Tizazu H. Mekonnen
Summary: HDPE was analyzed after being reprocessed multiple times to simulate recycling, and the effect on its properties was determined. HPCs were fabricated by compounding HP with recycled HDPE, and maleated HDPE was added as a compatibilizer. The recycling process resulted in crosslinking reactions and changes in viscosity, while maintaining the molecular weight. The addition of hemp content led to improvements in tensile modulus, but also increased water absorption. However, after compatibilization, all mechanical properties improved and water absorption decreased significantly.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Materials Science, Textiles
Anass Benhamou, Abdelghani Boussetta, Nabil Grimi, Mohammed El Idrissi, Mehdi Nadifiyine, Francisco J. Barba, Amine Moubarik
Summary: This study extracted cellulose microfibers from OFI cladodes and examined their reinforcement capability in PET matrix composite materials. The effects of fiber loading on physical properties of the composites were studied, with the 15% fiber loading composite showing the best mechanical properties in dry and wet conditions.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Engineering, Manufacturing
Zengquan Liu, Xiaochun Yin, He Zhang, Mengmeng Wang, Yanhong Feng
Summary: With the arrival of the 5G era, integrated and miniaturized intelligent devices have higher demands for thermal management materials. This study utilized an eccentric rotor solid extruder to fabricate oriented BN/UHMWPE composites with high thermal conductivity, by establishing a segregated 3D thermal conductive network below the melting temperature of the UHMWPE matrix. The prepared composite showed high orientation, thermal conductivity, and stability, making it suitable for electronic packaging applications.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Engineering, Geological
Christian Wireko, Tarek Abichou
Summary: The study found that LPB GCL exhibited better swelling and hydraulic performance when permeated with salt solutions, and the rate of polymer elution increased with the concentration and valence of the dominant cation.
GEOTEXTILES AND GEOMEMBRANES
(2021)
Article
Materials Science, Composites
Sedef Sismanoglu, Umit Tayfun, Yasin Kanbur
Summary: In this study, eco-grade thermoplastic polyurethane (TPU) with 46% renewable content was enhanced with date palm seed (DPS). Surface treatments, including alkali and silane treatments, were applied to the DPS to improve its compatibility with the TPU matrix. The results showed that the silane treatment significantly improved the mechanical properties of the composites due to the enhanced compatibility and interface adhesion between DPS and TPU. The treated DPS-containing composites exhibited higher storage modulus and glass transition temperature compared to the composites filled with pristine DPS. The addition of DPS also increased the thermal stability of the flexible segment of TPU, regardless of the surface treatment. Moreover, the DPS loadings caused a significant increase in the melt flow index (MFI) value of unfilled TPU. The silane-treated DPS-containing composite exhibited the lowest water uptake value among the samples, indicating its hydrophobicity. The SEM micrographs confirmed the improved interface adhesion between DPS and TPU in the silane-treated composite.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2022)
Article
Thermodynamics
Hussam Cirmad, Seha Tirkes, Umit Tayfun
Summary: The study focused on loading expandable graphite (EG) into acrylonitrile-butadiene-styrene (ABS) terpolymer and analyzing the performance of the composites through various tests. Results showed that with an increase in EG content, certain mechanical properties of ABS improved, while elongation and impact strength exhibited a decreasing trend. The 15% and 20% EG-containing ABS composites were identified as the most suitable candidates among the prepared composites.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Materials Science, Composites
Musa Has, Aysegul Erdem, Lemiye Atabek Savas, Umit Tayfun, Mehmet Dogan
Summary: The addition of expandable graphite improves the flame retardant and mechanical properties of carbon fiber reinforced polyamide 6 composites, but reduces their thermal stability.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Alinda Oyku Akar, Umit Hakan Yildiz, Seha Tirkes, Umit Tayfun, Ferda Hacivelioglu
Summary: The study demonstrated that the addition of CNT significantly increased the tensile strength and impact resistance of ABS/CF composites, and confirmed the synergy between CNT nanoparticles and CF through electrical conduction results.
Article
Energy & Fuels
Sedef Sismanoglu, Umit Tayfun, Petronela Gradinariu, Carmen-Mihaela Popescu, Yasin Kanbur
Summary: The study demonstrates that surface treatment of black cumin with silane can improve the biodegradability and other properties of eco-composites. The experiment results show that surface-modified black cumin with different functionalized silanes exhibits optimum performance in terms of thermal and thermo-mechanical analysis.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Materials Science, Composites
Aysenur Mutlu, Umit Tayfun, Mehmet Dogan
Summary: This research examines the potential use of melamine derivatives as flame retardant additives in thermoplastic polyurethane containing chicken feather, and evaluates the performance of the composites using different tests. The results show that the additives have different effects in different phases, with melamine cyanurate performing better in the gas phase and melamine phosphate and melamine polyphosphate performing better in the condensed phase.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2022)
Article
Chemistry, Applied
Hajar Bouzmane, Suha Tirkes, Volkan Murat Yilmaz, Umit Tayfun, Seha Tirkes
Summary: In this study, quartz and feldspar powders were surface treated using a silane coupling agent to improve their compatibility with the polymer matrix. The effects of surface treatments on the mechanical and thermo-mechanical properties of TPU-based composites were investigated. Results showed that the enrichment of quartz and feldspar surfaces improved the performance of the composites, with quartz exhibiting slightly higher performance due to its silica-rich composition. The silane layer on the mineral surface also acted as a barrier to water uptake of the composites.
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
(2023)
Article
Chemistry, Physical
Alperen Kaplan, Aysegul Erdem, Cagrialp Arslan, Soner Savas, Umit Tayfun, Mehmet Dogan
Summary: The development of polymeric nanocomposites provides a practical strategy to achieve weight reduction and enhance performance in structural applications. Polyamide 6 (PA6) is highly potential due to its high mechanical properties. In this study, four different silicon-containing nanomaterials (nanoclay, halloysite nanotube, dodecaphenyl polyhedral oligomeric silsesquioxane, and silica nanoparticles) are compared based on their reinforcing activities through various analyses. The best performance in different behaviors of composites is observed with different nanofillers.
Article
Engineering, Manufacturing
Umit Tayfun, Seha Tirkes, Mehmet Dogan, Suha Tirkes, Mehmet Zahmakiran
Summary: This study evaluates the use of porous pumice powder as an additive in ABS-based composite materials. The addition of pumice improves the mechanical and thermal properties of ABS, but excessive inclusion can lead to a decline in performance. Acidic pumice is more effective in enhancing the mechanical performance of the composites compared to basic pumice. Pumice addition also affects the melt flow behavior and glass transition temperature of ABS.
3D PRINTING AND ADDITIVE MANUFACTURING
(2022)
Article
Green & Sustainable Science & Technology
Umit Tayfun, Alinda Oykue Akar, Frat Hacoglu, Mehmet Dogan
Summary: Tuning the chemical functionality of lignocellulosic fiber through different modification routes enhances the interfacial adhesion of composite materials. Surface-modified coconut fiber improves the tensile strength and hardness of composites, and optimizes the thermo-mechanical response of thermoplastic polyurethane (TPU). Silane-modified coconut fiber composite exhibits the lowest water uptake due to the hydrophobic behavior of the silane layer. SEM investigations confirm the increased interfacial interaction between the TPU matrix and modified coconut fiber. The chemically enriched surface of coconut fiber improves the performance of composites by enhancing the adhesion in the TPU-coconut fiber interface.
Article
Chemistry, Applied
Umit Tayfun
Summary: In order to overcome compatibility leakage between composite phases, additives' chemical nature needs to be optimized. The surface of basalt fiber (BF) was chemically enriched via biobased epoxy resin sizing and functional silanization process to improve its interfacial adhesion. Surface properties were examined using SEM/EDX and FTIR analyses. Findings showed that surface-modified BF improved the tensile strength and hardness of composites. The results confirmed that enhanced interfacial adhesion led to performance improvements for BF-loaded EPU composites.
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
(2023)
Proceedings Paper
Polymer Science
Alinda Oyku Akar, Umit Hakan Yildiz, Umit Tayfun
Summary: In this study, the reinforcement of polyamide 6 (PA) matrix using purified, fine ground, and amino-silane treated halloysite nanotubes (HINT) at different concentrations was carried out. Mechanical test results showed slight improvements in tensile strength and Youngs' modulus with the addition of HINT. The addition of amino silane-modified HINT resulted in higher impact performance at concentrations up to 3%, while further addition of HINT caused a reduction in mechanical parameters.
PROCEEDINGS OF THE 36TH CONFERENCE OF THE POLYMER PROCESSING SOCIETY, PPS36
(2023)
Article
Green & Sustainable Science & Technology
Sedef Sismanoglu, Yasin Kanbur, Carmen-Mihaela Popescu, Diana Kindzera, Umit Tayfun
Summary: In recent years, scientific research has focused on environmentally friendly solutions for plastic-waste problems. In this study, mussel shells were integrated into green thermoplastic polyurethane composites and their surface modification improved the adhesion between composite phases. The modified composite materials showed enhanced mechanical and thermal properties compared to unmodified materials, along with improved wear resistance and water repellency. Furthermore, the addition of mussel shells increased the biodegradation rate of the composites, making them more environmentally friendly than pure polyurethane.
WASTE DISPOSAL & SUSTAINABLE ENERGY
(2023)
Article
Nanoscience & Nanotechnology
Alinda Oyku Akar, Umit Hakan Yildiz, Umit Tayfun
Summary: Polyamide 6 (PA) matrix was reinforced with different concentrations of Na-activated bentonite, amino functional silane treated bentonite, and organo-modified clays. Mechanical test results showed slight improvements in tensile strength and modulus parameters with filler additions to the PA matrix. Silane treated BNT exhibited better mechanical results compared to Na-activated bentonite additions. Thermal studies indicated that the inclusion of clay into the polymer matrix shifted the decomposition and melting temperatures of PA to higher values._organo-clay and bentonite additions with lower filling ratios enhanced the mechanical and thermal performance of polyamide.
REVIEWS ON ADVANCED MATERIALS SCIENCE
(2021)
Article
Green & Sustainable Science & Technology
Fatma Kucuk, Sedef Sismanoglu, Yasin Kanbur, Umit Tayfun
Summary: The present paper investigates the effect of diatomite on mechanical, thermo-mechanical, and morphological properties of thermoplastic polyurethane composites, finding a positive impact up to 30% diatomite content. However, further addition of diatomite caused remarkable reductions in related properties.
CLEANER ENGINEERING AND TECHNOLOGY
(2021)
