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Öğe Biowaste orange peel incorporated chitosan/polyvinyl alcohol composite films for food packaging applications(Elsevier Ltd, 2021) Terzioğlu, Pınar; Güney, Fatma; Parın, Fatma Nur; Şen, İbrahim; Tuna, SibelEcofriendly chitosan/polyvinyl alcohol (PVA) composite films enriched with orange peel were developed by solvent casting technique. The effect of various orange peel contents (0.25–1.25 % w/w) on the barrier, bioactivity, color, microstructure, mechanical, optical, physical, structural, and wettability properties of the chitosan/PVA films were investigated. Fourier Transform Infrared spectroscopy results showed the interaction between the orange peel and the polymers. The addition of orange peel increased the thickness, flexibility, thermal stability and water vapor permeability of the chitosan/PVA films. Orange peel loading improved the ultraviolet–visible light barrier characteristic of neat films by lowering the transparency value. The presence of orange peel in the composite films resulted in decrease of hydrophobicity and oxygen transmission rate. Furthermore, orange peel notably improved the antioxidant activity of films. Consequently, chitosan/polyvinyl alcohol/orange peel composite films may be potential ecofriendly bioactive packaging candidates for food preservation.Öğe Characterization of Olive Seed Powder Incorporated Low Density Polyethylene Composites(Sakarya University, 2025) Tuna, Sibel; Şen, İbrahimGlobal warming, increasing production and consumption rates, environmental concerns have revealed the need for some innovative material studies, and studies on the use of polymeric composites prepared with natural based fillers have become widespread to increase environmental awareness and ensure sustainable production. Composite materials prepared by using easily accessible, affordable, lightweight, high-strength plant based fillers can be used in many areas. In this study, composites of low density polyethylene (LDPE), which is one of the most widely used thermoplastics, were prepared by injection moulding process using the waste seeds of olives (OS), which have an important place in Turkey's agriculture and economy, and the density, hardness (Shore D), spectroscopic (Fourier transform infrared (FTIR) spectroscopy), morphological (Scanning electron microscopy (SEM)), mechanical, thermal (Differential Scanning Calorimetry (DSC), Heat Deflection Temperature (HDT) and Vicat softening temperature) analyses of OS filled LDPE composites were performed. As a result of the study, an increase in hardness and elastic modulus values of OS filled LDPE composites was observed, while no noticeable decrease in thermal properties was seen. © 2025, Sakarya University. All rights reserved.Öğe Characterization of Olive Seed Powder Incorporated Low Density Polyethylene Composites(2025) Tuna, Sibel; Şen, İbrahimGlobal warming, increasing production and consumption rates, environmental concerns have revealed the need for some innovative material studies, and studies on the use of polymeric composites prepared with natural based fillers have become widespread in order to increase environmental awareness and ensure sustainable production. Composite materials prepared by using easily accessible, affordable, lightweight, high-strength plant based fillers can be used in many areas. In this study, composites of low density polyethylene (LDPE), which is one of the most widely used thermoplastics, were prepared by injection moulding process using the waste seeds of olives (OS), which have an important place in Turkey's agriculture and economy, and the density, hardness (Shore D), spectroscopic (Fourier transform infrared (FTIR) spectroscopy), morphological (Scanning electron microscopy (SEM)), mechanical, thermal (Differential Scanning Calorimetry (DSC), Heat Deflection Temperature (HDT) and Vicat softening temperature) analyses of OS filled LDPE composites were performed. As a result of the study, an increase in hardness and elastic modulus values of OS filled LDPE composites was observed, while no noticeable decrease in thermal properties was seen.Öğe MANUFACTURING AND CHARACTERIZATION OF SUGAR BEET PULP PARTICLES FILLED POLYPROPYLENE MATRIX BIOCOMPOSITE(2025) Gökdemir, Barış; Sever, Kutlay; Atagür, Metehan; Şen, İbrahimIn this study, Polypropylene (PP) matrix biocomposites were developed with the aim of reducing sugar beet pulp (SP) waste and demonstrating the potential of agricultural waste materials in various applications. Sugar beet pulp extracted from a sugar production factory was subjected to a drying process and then mechanically ground. Following this process, the resultant powdered sugar beet pulp particles were subjected to a sieving process, yielding particles within the size range of 100–250 ?m. These particles were then incorporated into the pure PP matrix at filling levels ranging from 5% to 20%. Subsequently, the mechanical (tensile, flexural, DMA), thermal (TGA, DSC), and chemical (FTIR) properties of these biocomposites were investigated. DMA results indicated a notable improvement in storage modulus with increased filler content, supporting the stiffening effect of sugar beet pulp particles. DSC analysis showed minimal change in melting temperature, but a slight decrease in crystallinity degree with higher filler ratios. FTIR spectra confirmed the presence of characteristic functional groups from lignocellulosic sugar beet pulp within the PP matrix, indicating successful incorporation. It was determined that the elastic modulus in the PP matrix biocomposites increased as the amount of sugar beet pulp particles increased. When the thermogravimetric analysis (TGA) data of PP and biocomposites were compared, an increase in the maximum degradation temperature (Tmax) was observed as the SP100 and SP250 ratio increased, while a decrease in the temperature at which degradation began (Ton) was observed. These biocomposites demonstrate promising potential for application in the automotive, packaging, and construction industries as sustainable materials.Öğe Polyamide 12/Antimony Trioxide/Sepiolite or Boron Composites: Mechanical Properties and Flame Retardancy(2020) Öztürk, Ahmet Muşteba; Sarıbal, Fırat; Duman, Şeyma Duman; Akkoyun, Meral; Şen, İbrahim; Dondas, Dıdem OvalıThis study reports on the mechanical and flame-retardancy properties of polyamide 12 (PA 12) based composites reinforced with antimony trioxide, sepiolite, or boron powders. These composites were fabricated by the twin-screw extruder and hot-press techniques. The microstructural characteristics and flame-retardancy of the PA 12-based composite samples were obtained by using a scanning electron microscope, a vertical UL-94 burning, and limiting oxygen index tests. The Shore-D hardness, Charpy impact, and tensile tests were conducted to reveal the mechanical performance of composites. The PA 12/antimony trioxide/sepiolite sample presented the best mechanical performance. The additions of antimony trioxide/boron into the PA 12 matrix gave the best contribution to the flame-retardancy.Öğe Production and Characterization of Electrical Conductive Polymeric Hybrid Composites Containing Organic and Inorganic Materials(Prof.Dr. İskender AKKURT, 2025) Sever, Kutlay; Yılmaz, Hüseyin; Atagür, Metehan; Şen, İbrahimPolymer composites are becoming more and more involved in many industries such as aerospace, automotive, transportation and sports. As usage increases in the commercial market, the polymer industry provides materials to almost every area of technology and industry, allowing the production of materials or new materials to be produced and the development or orientation of new types of needs. In the last 10 years, the use of polymer composites has become the new materials needed in electronic technology. The aim of this study is to investigate the effects of polypropylene (PP) on mechanical and conductivity properties by using mica (M) as an inorganic filler and carbon nano tube (CNT) as an organic filler. Before hybrid composite materials were produced, polypropylene (PP) and M-PP composites were produced and composite with the best mechanical properties were selected. PP-M composites were produced by using a thermokincetic mixer with the addition of mica in 10%, 20%, and 30% weight ratios. Hybrid composites were manufactured using CNT addition into PP-20M with %1, %3, %5, and %7 weight ratios. Mechanical properties of the composite materials produced using tensile and bending tests and viscoelastic properties by dynamic mechanical analysis (DMA), thermal properties by differential scanning calorimeter (DSC) and thermogravimetric (TGA) analyses and morphological structures by scanning electron microscopy (SEM) were investigated. © IJCESEN.Öğe SiO? İlavesinin Borik Asit Çapraz Bağlı Polivinil Alkol (PVA) Filmlerinin Mekanik ve Termal Özellikleri Üzerindeki Etkisi(Bursa Uludağ Üniversitesi, 2025) Şen, İbrahimBu çalışmada, suda çözünebilen polivinil alkol (PVA) hem borik asit (BA) ile çapraz bağlanarak hem de çapraz bağlı PVA'ya farklı oranlarda SiO2 eklenerek termal, mekanik ve kimyasal değişimleri incelenmiştir. Mekanik özellikler için çekme mukavemeti (TS), maksimum çekme mukavemetinde yüzde uzama (ETS) ve elastik modül (EM) parametreleri araştırılmıştır. Bulgular, BA ile çapraz bağlamanın TS ve EM değerlerinde bir artışa yol açtığını ve ETS'de bir azalmaya neden olduğunu ortaya koymuştur. Buna karşılık, SiO2'nin dolgu malzemesi olarak dahil edilmesi tüm parametrelerde düşüşe neden olmuştur. Termal özellikleri aydınlatmak için diferansiyel taramalı kalorimetri (DSC), termogravimetrik analiz (TGA) ve dinamik mekanik analiz (DMA) yapılmıştır. Sonuçlar, BA ile çapraz bağlamanın termal kararlılığı önemli ölçüde artırdığını, SiO2 ilavesinin ise önemli değişiklikler sağlamadığını göstermiştir. DSC analizine göre, hem BA ile çapraz bağlama hem de çapraz bağlı PVA'ya SiO2 eklenmesi, PVA filmlerinin camsı geçiş sıcaklığında (Tg) düzenli artışlara neden oldu. DMA analizinde tan ? termogramında Tg pikleri gözlenmiş ve bu piklerdeki artışın dalgalı olduğu tespit edilmiştir.
