Sürdürülebilir Kalkınma Amaçları

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Yazarlar

• Aydin, C.(2)
• Aydin, H.(2)
• Kısmet, Y.(2)
• Taskin, M.(2)
• ALMisned, Ghada(1)
• Aydin, Handan(1)
• Ayikurt, P.(1)
• Barim, Esra(1)
• Barım, Esra(1)
• Başgöz, Öyküm(1)
• Biryan, Fatih(1)
• Bulut, N.(1)
• Canbay, Canan A.(1)
• Coşkun, Meltem(1)
• Dagdelen, F.(1)
• Demir, Pınar(1)
• Değirmenci, Mustafa(1)
• Dogan, A.(1)
• Fiedler, B.(1)
• Güler, Seval Hale(1)
• Güler, Ömer(1)
• Höchstötter, K.H.(1)
• Issa, Shams A.M.(1)
• Kaygili, O.(1)
• Kirilmiş, Cumhur(1)
• Kök, Mediha(1)
• Orhan, A.(1)
• Pamuk Ayikurt(1)
• Pihtili, Güzin(1)
• Tekin, H.O.(1)
• Torgut, Gülben(1)
• Zakaly, Hesham M.H.(1)
• Çirak, Z Deniz(1)

• MakaleAçık Erişim2026Scopus SJRQ2/r/munzur/1389
  Design of Fe–35Ni/PCL nanocomposites with coupled magnetic and shape memory properties

  Kök, Mediha; Çirak, Z Deniz; Aydin, Handan; Coşkun, Meltem

  In this study, poly(ϵ-caprolactone) (PCL)-based nanocomposite films reinforced with a Fe–35%Ni alloy, which possesses a low coefficient of thermal expansion and distinct magnetic properties, were produced. The composites were prepared using the solvent casting method, with the Fe–Ni alloy incorporated into the PCL matrix at different weight ratios (10%–50%). The structural, morphological, thermal, and magnetic properties of the resulting nanocomposites were comprehensively investigated using FTIR (Fourier transform infrared spectroscopy), XRD (X-ray diffraction), SEM (scanning electron microscopy/energy dispersive x-ray spectroscopy), differential scanning calorimetry, TGA (Thermogravimetric analysis) ve (vibrating sample Magnetometry). FTIR results indicated that the Fe–Ni addition does not form chemical bonds with the PCL matrix and that the composite structure is formed through physical interactions. XRD analyses confirmed that the semi-crystalline structure of PCL is preserved and that the Fe–Ni alloy exhibits a face-centered cubic (FCC) crystal structure. SEM images revealed that while a homogeneous distribution is achieved at low doping levels, partial agglomeration occurs at high levels. Thermal analyses showed that Fe–Ni particles increase the degree of crystallization through a nucleation effect and provide a significant increase in melting temperature and crystallinity values, particularly in the 10%–40% range. TGA results revealed that the thermal stability of the composites increased and their decomposition behavior became multi-stage. Magnetic measurements showed that the saturation magnetization increased significantly with increasing Fe–Ni content, and the composites acquired ferromagnetic character. Furthermore, it was determined that the developed composites exhibit distinct shape memory behavior and can return to their original form upon thermal stimulation. The findings indicate that Fe–35%Ni-doped PCL nanocomposites are a promising candidate for multifunctional applications due to their enhanced thermal, magnetic, and smart material properties.

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• MakaleAçık Erişim2025Scopus SJRQ3/r/munzur/1338
  A study on copolymers of styrene with a methacrylamide containing benzofuran side group: Their monomer reactivity ratios, thermal stabilities, thermal degradation kinetics

  Barim, Esra; Demir, Pınar; Değirmenci, Mustafa; Kirilmiş, Cumhur

  The aim of this study was to determine the monomer reactivity ratios, thermal properties and thermal degradation behavior of new P(N-[2-(4-brombenzoyl)-benzofuran-3-yl]-2-methac-rylamide-co-styrene) polymers synthesized at different compositions. For this purpose, novel copolymers of N-[2-(4-brombenzoyl)-benzofuran-3-yl]-2-methacrylamide (NBBM) monomer with styrene (St) monomer were prepared using free radical polymerization method. The 1 H-NMR spectra was used to calculate the compositions of the copolymers. The reactivity ratios of monomers were calculated in line with the universal copolymerization equation using Kelen-Tüdös and Finemann-Ross linearization methods, and found to be r1:0,62 r2:1,09 and r1:0,61, r2:1,07 respectively (where r1 is reactivity ratio of NBBM). DSC, TGA and DTG were used to study the thermal behaviors of the copolymers. The Tg value of P(NBMM) was found to be 211oC and the Tg values of the studied copolymers were determined to increase from 144oC to 184oC with increasing concentration of NBMM units. Thermal data showed that the maximum degradation temperatures increased from 349oC to 391oC as the St units increased in the copolymer system. The activation energy (Ea) values of P(NBBM) and the studied copolymer were determined from the TGA curves obtained at different heating rates and the Flynn-Wall-Qzawa, Kissinger, Tang isoconversional methods were used. Solid state reaction mechanisms were also calculated by being used the Van Krevelen method, a non-isoconversion model. The Ea values obtained with isoconversion models for P(NBBM) and copolymer were found very close to the values obtained from non-isoconversion models. Moreover, the R3 mechanism was proposed for the homopolymer and copolymer.

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• MakaleAçık Erişim2025Scopus SJRQ2/r/munzur/1061
  Effect of Nano Titanium Dioxide on the Electrical and Thermal Properties of Poly(2,2,2-Trifluoroethyl Methacrylate) for Dielectric Materials

  Barım, Esra; Torgut, Gülben

  The increasing application areas of energy storage devices in recent years make it necessary to produce materials with sufficient efficiency. In this study, composites of poly(2,2,2-trifluoroethyl methacrylate) P(TFEM) homopolymer with nano titanium dioxide (TiO2 NPs) were prepared for applications of these devices requiring thermoelectric properties, and their thermal, dielectric, and electrical properties were investigated. Thermogravimetric analysis showed that TiO2 NPs in all composites limited the thermal diffusion of TiO2 NPs in the polymer matrix and increased the thermal stability of P(TFEM) from 341°C to 361.5°C. As dielectric properties, the dielectric constant (ε′), dielectric loss (ε″), AC conductivity (σac), and real (Z′) and imaginary (Z″) components of impedance of the composites containing TiO2 NPs were evaluated as functions of frequency and different weight percentages of TiO2 NPs. Increases in ε′ and ε″ at up to 15 wt% TiO2 NPs suggested increased dipole polarization. At 100 Hz, the ε″ value of P(TFEM) increased from 3.2 × 10−2 to 1.1 × 10−2, σac increased from 4.98 × 10−10 to 1.00 × 10−8, Z′ increased from 3.67 × 1010 to 8.66 × 1010, and Z″ increased from 2.09 × 108 to 4.42 × 108. Furthermore, ε′, ε″, and impedance decreased with increasing frequency for both P(TFEM) and TiO2 NPs composites, while σac increased with increasing frequency.

  AtıfScopus3·OpenAlex5

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• MakaleYalnız künye2025Scopus SJRQ3/r/munzur/946
  Development of alternative carbon fibre powder and rare earth element-based filler for high density polyethylene; [Entwicklung von alternativen Kohlenstofffaserpulvern und Seltene Erden-basierten Füllstoffen für Polyethylen hoher Dichte]

  Ayikurt, P.; Kısmet, Y.; Dogan, A.; Höchstötter, K.H.; Fiedler, B.

  This study developed alternative fillers to enhance the flowability of high-density polyethylene (HDPE). Lanthanum and cerium oxide with over 90 % purity were used as binder interfacial elements in fillers developed using both carbon fiber powder wastes and powder coating wastes. Polyethylene gel was used to make the fillers thermoplastic and homogenous. A total of six different fillers were developed and melt flow index analyses were performed. As a result of these analyses, it was found that the fluidity of high-density polyethylene improved significantly, especially with fillers containing carbon fiber powder. As a result, high-density polyethylene mixtures containing 10 %, 20 %, 30 %, 40 %, and 50% by weight of carbon fiber powder-based fillers were pressed into molds by a plastic injection molding machine, and samples were produced. According to the mechanical analysis results of these specimens, tensile and flexural strengths decreased slightly depending on the filling ratio, while the impact strengths remained constant. Differential scanning calorimetry analysis was performed to determine the glass transition temperature and melting/crystallization temperatures of the obtained mixtures, while thermogravimetric analysis was performed to determine the mass losses. At the same time, electron microscope analysis of the cross sections of the samples were performed.

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• MakaleYalnız künye2024Scopus SJRQ3/r/munzur/2126
  Powder coating waste filler in high-density polyethylene – Variations in morphology, mechanical and thermal performance; [Variationen in Morphologie, mechanischer und thermischer Leistung von Pulverlackrecyclaten als Füllstoff in Polyethylen mit hoher Dichte]

  Kısmet, Y.

  In the present study, electrostatic powder coating waste was recycled and employed to reinforce high-density polyethylene. The hydrolysis method was preferred to modify the powder coating waste of various systems, and they were mixed with high-density polyethylene at various weight ratios. The mixtures were prepared in a mechanical mixer and then in an extruder to obtain a homogeneous mixture. This homogeneous structure was pressed into molds with a plastic injection device to obtain standard tensile samples. Mechanical and thermal tests were conducted on the samples. It was determined that the tensile stress of the sample decreased with the increase in filler content. The changes in sample tensile strength were investigated after the samples were aged. Three-point bending strength of the samples was also investigated and it was observed that they became more resistant to vertical loads as the filler content increased. The Izod impact strength of the samples differed based on the filler type and weight ratio. Furthermore, mass loss in the produced mixtures was determined with thermogravimetric analysis. The matrix and filler bonding mechanisms were observed under an electron microscope.

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  AtıfScopus1·WoS1·OpenAlex1

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• Yüksek Lisans TeziAçık Erişim2023/r/munzur/7310
  Karbon elyaf takviyeli polietilenin mekanik, termal vefiziksel özelliklerine nadir toprak elementlerinin etkileri

  Pamuk Ayikurt

  Bu çalıĢmada termoplastiklerin önemli bir üyesi olan polietilenin mekanik, termal ve morfolojik özellikleri üzerine karbon elyaf tozu ve nadir toprak elementlerinin etkileri incelenmiĢtir. Polietilen olarak alçak yoğunluklu (AYPE) ve yüksek yoğunluklu (YYPE) polietilenler ayrı ayrı çalıĢılmıĢtır. Nadir toprak elementi olarak ise %90 ve üzeri saflıkta lantan ve seryum oksitler kullanılmıĢtır. Öncelikle bu elementler saf suda ayrı ayrı çözüldükten sonra karbon elyaf tozu bu çözeltilere karıĢtırıldı. Lantan ve seryumun karbon elyafa emilimi sağlandıktan sonra bu karıĢımlar hazırlanan alçak yoğunluklu polietilen çözeltisi içerisine dökülerek termoplastik karakterde takviye elemanı geliĢtirildi. Lantan ve seryum esaslı olarak ayrı ayrı elde edilen bu takviye elemanları kurutulup granül hale getirildikten sonra çalıĢmada kullanılacak olan matris malzemeler (AYPE ve YYPE) ile ayrı ayrı ağırlıkça %5, %10, %20 ve %30 oranlarında önce mekanik olarak daha sonrada uygun sıcaklıklarda ekstrüzyonda homojen olarak karıĢtırıldı. Ekstrüzyonda homojen hale getirilen bu karıĢımlar ekstrüzyon çıkıĢında soğutuldu ve akabinde kırıcıdan geçirilerek granül hale getirildi. Elde edilen bu granüller plastik enjeksiyon makinası ile kalıplara basılarak standart çekme çubukları üretildi. Üretilen bu çekme çubuklarının mekanik olarak çekme, eğilme, izod darbe ve sertlik analizleri gerçekleĢtirildi. Elde edilen karıĢımların camsı geçiĢ sıcaklıkları, erime sıcaklıkları ve kütle kayıplarının belirlenmesi için ise TGA/DTA analizi yapıldı. Aynı zamanda matris ve dolgu arasında ki bağlanma mekanizmasının belirlenmesi için ise numunelerin kesit görüntüleri elektron mikroskobu ile incelendi. Hem AYPE hem de YYPE içerisinde artan takviye elemanı miktarına bağlı olarak değiĢimler grafiklerle gösterilerek tartıĢıldı.

  İncele
• MakaleAçık Erişim2022Scopus SJRQ2/r/munzur/2677
  Synergistic effect of boron nitride and graphene nanosheets on behavioural attitudes of polyester matrix: Synthesis, experimental and Monte Carlo simulation studies

  Başgöz, Öyküm; Güler, Seval Hale; Güler, Ömer; Canbay, Canan A.; Zakaly, Hesham M.H.; Issa, Shams A.M.; ALMisned, Ghada; Tekin, H.O.

  We report the synergistic effects of boron nitride and graphene nanosheets on physical, structural, and nuclear radiation attenuation properties of polyester matrix-incorporated nanocomposites. Some critical material properties are thoroughly evaluated for several types of synthesized samples. Polyester is employed to strengthen graphene and boron nitride nanolayers, and their characteristics are investigated in detail. Additionally, we report the gamma-ray and fast neutron attenuation characteristics of synthesized nanocomposites to get a better understanding of the reinforcing effect as a function of material type and weight percentage. Thermal analysis findings indicate that adding graphene lowers the decomposition temperature but co-adding graphene and BNNS enhances thermal decomposition in comparison to graphene itself. Tensile tests showed that the inclusion of both GRP and GRP/BNNS strengthens the material. Among the polyester composite samples analyzed, the G3 sample with the most GNP reinforcement had the lowest HVL values throughout the broadest range of energy levels investigated. The recent findings may be beneficial to the scientific community in terms of incorporating these reinforcing types and ratios into polyester materials for a variety of applications, including industrial and research purposes.

  AtıfScopus22·OpenAlex19

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• MakaleAçık Erişim2021Scopus SJRQ2/r/munzur/2406
  Study on the thermal and electrical properties of novel poly[propyl acrylate-co-phenyl methacrylate] containing acetamido group

  Biryan, Fatih; Pihtili, Güzin

  In the available research, firstly a new 3-acetamido phenyl acrylate (APhA) monomer and a novel copolymer containing acetamido phenyl group were synthesized. 3-acetamido phenyl acrylate (APhA) monomer was acquired by the reaction of acryloyl chloride and N-(3-hydroxyphenyl) acetamide. 3-acetamido propyl methacrylate (AAPMA) monomer was prepared in our previous study. A series of copolymers were prepared using these monomers in different mole ratios by free-radical polymerization method at 70 °C The structure of P(AAPMA-co-APhA) copolymer systems was characterized by FT-IR and NMR techniques. Thermal characteristics of P(AAPMA-co-APhA) copolymers were evaluated through thermogravimetric analysis (TGA) and differential scanning calorimeter (DSC) in an N2 atmosphere. Due to the presence of the amide group, we can say that the polymer with the least weight loss and the highest residue percentage at 500 °C is poly(APhA). AC electrical conductivity and dielectric and electrical parameters were analyzed in a range of 100 Hz–20 kHz frequency. The dielectric constant values of poly(AAPMA-co-APhA0.63) and P(AAPMA-co-APhA0.30) were 4.98 and 4.57 respectively. According to the results, the dielectric value decreased as the APhA units increased.

  AtıfScopus5·WoS5·OpenAlex5

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• MakaleYalnız künye2020Scopus SJRQ2/r/munzur/3564
  The effect of graphene oxide on structural, opto-electrical and thermal properties of manganese sillenite (Bi12MnO20) nano-powders

  Aydin, C.; Taskin, M.; Aydin, H.

  In this study, manganese sillenite nano-powders were produced by hydrothermal method by adding graphene oxide in different mass amounts. Structural, morphological, thermal, optical and electrical properties of the obtained undoped and graphene-oxide-doped samples were investigated. XRD results showed that the produced samples had nano-sizes and the crystal sizes changed with the addition of graphene oxide. SEM and TEM images showed that the microstructures of the samples were nano-sized and composed of randomly oriented particles without orientation relationship between them. From FT-IR spectra of the samples, chemical properties and bond structures were determined. With the help of thermal analysis measurements, reactions in the sample structures at increasing temperatures, reaction temperatures, reaction energies and total mass losses were determined. The forbidden energy ranges of the samples decreased at significant rates with the addition of graphene oxide. By checking the P–E hysteresis cycles, the samples are understood to show ferroelectric properties. Dielectric measurements and temperature-dependent electrical conductivity measurements of the produced nano-powders confirmed that the samples exhibited semiconductor behaviour. The obtained results showed that manganese sillenites can be synthesised by low-temperature hydrothermal method and physical, chemical and thermal properties can be controlled by adding different amounts of graphene oxide for use in electronic and energy applications.

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  AtıfScopus6·WoS6·OpenAlex6

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• MakaleAçık Erişim2020Scopus SJRQ2/r/munzur/3363
  Variation with graphene oxide doping of structural, optical, dielectric and thermal properties of BaCO3:ZnO nanocrystals synthesized by solgel combustion method

  Aydin, H.; Taskin, M.; Aydin, C.; Dagdelen, F.; Kaygili, O.; Bulut, N.; Orhan, A.

  The results obtained from thermogravimetric (TG) analysis, X-ray diffraction analysis, optical characterization and dielectric measurements of the samples were investigated. In X-ray diffraction patterns, the presence of both BaCO3 and ZnO peaks showed that ZnO and BaCO3 nanocrystals were independently grown. Changes in the band peak position in the FTIR spectra showed that the chemical structure of Ba:Zn nanocomposites changed with the doping of graphene oxide. The optical band gap (Eg) of the samples was calculated as 3.18, 3.19, 3.2, 3.21 and 3.23 eV for BaZn, BaZn25, BaZn50, BaZn75 and BaZn100, respectively. It was determined that the dielectric constants and dielectric losses of the nanocomposites exhibited normal dielectric behavior, decreased with the frequency described in light of Maxwell–Wagner model and increased with increasing graphene oxide concentration. TG measurement showed that the mass loss in the sample decreased with increasing graphene oxide.

  AtıfScopus4·WoS4·OpenAlex4

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