Yazar "Eroglu, Murat" seçeneğine göre listele

Listeleniyor 1 - 8 / 8
  • Küçük Resim Yok
    Öğe
    Development and Characterization of Novel Polylactic Acid/Calcium Fluoride Biocomposite Films: Effects on Structural, Mechanical, Thermal, and Optical Properties
    (Wiley-V C H Verlag Gmbh, 2025) Eroglu, Murat
    Novel biocomposite films produced from polylactic acid (PLA)/calcium fluoride (CaF2) have been developed and characterized in this study through solvent casting methods. The PLA matrix was incorporated with CaF2 powder at different concentrations (0.5-30 wt%), which can keep the biodegradability but improved material properties. The structural, mechanical, thermal, and optical effects of varying CaF2 content were discussed using XRD, FTIR, SEM, TGA, DSC, and mechanical tests. About 30 wt% increases in the tensile strength of the P30 sample (30 wt% CaF2) have shown to be significantly improved, from 9.3% to 30.6% by CaF2 supplement. SEM analysis showed that due to excessive CaF2 loading, points of stress concentration and hence surface cracks appeared indicating the loading limit. Thermal analysis proved to improve stability at higher amounts of CaF2 (>5 wt%), shown in TGA results with reduced mass loss and ash content. However, with increasing CaF2 content, the optical properties were compromised, resulting in more opaque and yellowish films. All of this showed that, however, CaF2 appears to be a very good reinforcing agent for PLA, optimum loading must be weighed for mechanical, thermal, and optical properties. It is evidence toward the improvement of enhanced PLA-based biocomposites for numerous applications, maintaining environmental sustainability.
  • Küçük Resim Yok
    Öğe
    Ecofriendly quince peel powder incorporated Polylactic acid biocomposite film
    (Sage Publications Ltd, 2024) Sen, Ibrahim; Eroglu, Murat; Severgun, Olcay; Kizil, Demet
    This study aims to develop sustainable, renewable and biodegradable biocomposite films from environmentally friendly materials. For this purpose, completely biodegradable polymer composites were prepared by mixing polylactic acid (PLA) with a new source, quince peel (QP), by solvent casting method, and their structural, mechanical and thermal properties were examined. The tensile strengths of the composites prepared using QP in proportions varying between 5% (P5Q) and 30% (P30Q) by weight vary between 21.13 +/- 0.80 and 12.01 +/- 0.10 MPa, and their elongations at break vary between 11.33 +/- 0.38 and 4.08 +/- 1.06 %. As the QP contribution increased, the tensile strength and breaking elongation of these composites generally decreased, while the elastic modulus also increased. Among these composites, whose elastic modulus varies between 1040.00 +/- 140.01 and 811.33 +/- 13.31 MPa, it was determined that the elastic modulus (1040.00 +/- 140.01 MPa) of the 20% QP added composite (P20Q) was higher than the others. When the thermal analysis of PLA/QP films were examined, it was observed that the glass transition temperatures (Tg) were between 58.54 and 51.45 degrees C and the melting temperatures (Tm) were between 167.71 and 164.28 degrees C, and these temperatures generally decreased with increasing QP doping. When the T50 values, which represent the temperature at which 50% of the composite materials decompose, were examined, it was found that the QP-added ones were higher than the pure composites. While this value was 317.96 degrees C in pure PLA composite, T50 values varied between 327.92 and 340.80 degrees C depending on the varying QP ratios. According to the XRD results performed to evaluate the crystalline properties of PLA composites containing quince bark, the crystallinity of pure PLA was determined as 19.5% and the crystallinity of composites containing 5, 10, 20 and 30 wt % QP additives was determined as 19.3, 18.3, 16.4 and 14.6%, respectively.
  • Küçük Resim Yok
    Öğe
    Effect of Olive Leaf Powder on Structural, Thermal, Mechanical, and Antioxidant Properties of Polylactic Acid Based Biocomposite Films
    (Wiley, 2025) Tuna, Sibel; Kizil, Demet; Sen, Ibrahim; Eroglu, Murat
    In the present study, polylactic acid films containing olive leaves with different particle sizes and different additive ratios were characterized in terms of structural, thermal, mechanical, and antioxidant properties. XRD and SEM analyses showed that PLA films with olive leaf powder generally have an amorphous structure, whereas films with low filler ratios and fine particles exhibit higher crystallinity. Not so surprisingly, neither filler amount nor mixing time are making a big difference in the crystallinity or morphology of the surface. In the context of DSC analysis, a maximum variation of 2 degrees C in the glass transition temperature was observed. A comparable trend shift was observed between the Tg (glass transition temperature for DMA) values in the DMA analysis and the Tg (glass transition temperature for DSC) values in the DSC analysis. However, the change in the DMA analysis was more definitive. Antioxidant activity of the films was observed to increase with decreasing particle size of olive leaves added to polylactic acid and increasing additive ratio. Adding olive leaf powder to PLA and then looking at the effects on these aspects as mechanical, thermal, morphological, and antioxidant properties contributed to the evaluation of PLA as a potential additive for producing biodegradable polymers.
  • Küçük Resim Yok
    Öğe
    Effect of peach peel on shape memory properties of polylactic acid
    (Sage Publications Ltd, 2024) Eroglu, Murat
    In this study, two different peach peel powders were produced using the sieving process: with fiber (filler-fiber powder) and without fiber (filler powder). To investigate the effects of the prepared powders on the shape memory properties of PLA, PLA/Filler (wt%90 PLA: wt%10 filler) and PLA/Fiber-Filler (wt%90 PLA: wt%10 Fiber-Filler) biocomposite films were prepared by the solvent casting technique. The shape memory properties of the films, such as shape fixity ratio and shape recovery ratio, were determined by the bending test. For the PLA film, the shape fixity ratio is 81 +/- 5%. When filler powders are applied, the shape fixity ratio is unaffected. However, when fiber-filler powder is added, the shape fixity ratio drops to 75 +/- 1%. The shape recovery ratio for PLA film is 50 +/- 7%. The shape recovery ratio increases to 54 +/- 4% when filler powder is added. However, the percentage of shape recovery ratio remains the same when filler-fiber powders are added. Shape memory performance can be enhanced by adding peach peel filler powder to the PLA. The peach peel filler can be considered as a cost-effective filler to improve the shape memory properties of PLA-based biocomposites. As a result, peach peel filler reinforced PLA based composite films may be possible low-cost and biodegreadable shape memory material candidates for a variety of industries like aerospace and soft robotics.
  • Küçük Resim Yok
    Öğe
    Evaluation of ultrasonic probe and bath sonication methods for the dispersion of TiO2 nanoparticles in PLA-based nanocomposites
    (Sage Publications Ltd, 2025) Severgun, Olcay; Eroglu, Murat
    Polylactic acid (PLA) is a promising biodegradable polymer that has someday, valuable applications in many industries. Its inherent brittleness and limited thermal stability, however, are restricting its wider use. In this study, titanium dioxide (TiO2) nanoparticles were added to PLA films to enhance their mechanical and thermal properties. The two different methods of dispersing the nanoparticles, ultrasonic-probe sonication (UPS) and bath sonication (BS), were investigated for their effectiveness to achieve homogeneous nanoparticle distribution. The findings revealed improvement in mechanical and thermal properties of PLA/TiO2 nanocomposites using both methods. UPS outperformed in achieving better dispersion, which led to measurably enhanced material properties. However, BS proved to be a valid and economically feasible method, producing composites with substantially improved properties compared to pure PLA, making it suitable for large-scale applications. Results indicated that the two approaches could thus be effectively utilized in creating high-performance nanocomposites from PLA intended for environmentally friendly biodegradable packaging, biomedical materials, or structural components requiring improved property performance.
  • Küçük Resim Yok
    Öğe
    Incorporatıon of carob pod powder on polyvınyl alcohol-based bıocomposıte hydrogel fılm
    (Springer, 2025) Mutlu, Busra; Eroglu, Murat
    Carob pod powder (CP), a neglected agro-waste material, provides a sustainable, cheap substitute for synthetic fillers, meeting the global demand for eco-friendly materials. In this context, this study investigates the incorporation of CP into polyvinyl alcohol (PVA)-based biocomposite hydrogel films to enhance their mechanical, structural, physicochemical, physical, and optical properties. The hydrogel films were prepared by dissolving PVA in distilled water, followed by the addition of CP powder at varying concentrations (5%, 10%, and 20% by weight). The mixtures were crosslinked using 6 M NaOH solution. Characterization of the prepared hydrogel samples was carried out by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), mechanical and optical testing. The results showed the addition of CP powder considerably improves the tensile strength and elongation at break of the hydrogel films, being most effective at 10% CP concentration. Hydrogel samples experienced decreasing moisture content and swelling ratios with increasing CP content, producing a more compact and hydrophobic structure. Optical properties, such as color and clarity, were affected by increased CP loadings, with darker films and reduced transparency at these higher CP levels. Thus, it can be stated that CP powder is a viable natural filler to enhance the properties of PVA-based hydrogel films for various biomedical and packing applications. We demonstrate the applicability of CP as a natural filler to facilitate sustainable hydrogel film design for biomedical and packaging applications. The work addresses both performance challenges and environmental concerns.
  • Küçük Resim Yok
    Öğe
    Manufacturing and Characterization of Three Modified Vegetable Oil-Added Polylactic Acid Composites
    (Wiley, 2024) Sen, Ibrahim; Atagur, Metehan; Tuna, Sibel; Eroglu, Murat; Kurtlu, Meral Akkoyun; Sever, Kutlay
    Polylactic acid (PLA) was modified with three types of modified vegetable oils (MVOs), which are the epoxidized soybean oil (ESBO), maleinized sunflower oil (MSO), and maleinized olive oil (MOO), at different weight fractions. A corotating twin screw extruder was used to produce composite materials by the melt-mixing process. The effect of MVO content, from 2.5% to 10%, on the morphology, mechanical properties, density, and water absorption was investigated in detail. The addition of ESBO and maleinized vegetable oils leads to a slight decrease in the density of PLA from 1.252 to 1.231 g/cm3. As the concentration of MVO in PLA increases, the amount of water absorption also increases, and the highest water absorption value was observed in P10MSO. The FTIR spectra of all concentrations of the MOO and MSO have two peaks at 1781 and 1861 cm-1, attributed to the C=O stretching which is related to maleic acid copolymerization. In general, the elastic modulus (EM) was slightly changed by the addition of MVOs to PLA, while the tensile strength (TS) decreased. Due to the plasticizing effect of MVOs, an increase in the Izod impact strength was obtained.
  • Küçük Resim Yok
    Öğe
    Rosehip (Rosa rugosa) seed essential oil-loaded polyvinyl alcohol/ carboxymethyl cellulose biocomposites for active packaging applications
    (Elsevier, 2025) Eroglu, Murat; Severgun, Olcay; Mutlu, Busta
    This research focused on fabricating eco-conscious biocomposite films composed of polyvinyl alcohol (PVA) and carboxymethyl cellulose (CMC) incorporated with rosehip seed oil (RSO) for active packaging applications. The effects of RSO concentrations (1-5 %w/w) on the morphological, structural, mechanical, thermal, physical, optical and barrier properties as well as antioxidant and antibacterial features of the biocomposite films were systematically investigated. Scanning electron microscopy analysis demonstrated that the films' morphology could be tuned by varying RSO content, while Fourier transform infrared spectroscopyanalysis confirmed interactions between RSO and the polymer matrix. Moreover, the incorporation of RSO significantly influenced the mechanical properties increasing the tensile strength to 62.0 +/- 5.2 MPa, while reducing the elongation at break to 5.2 +/- 0.8 % at higher concentrations due to restricted chain mobility. The inclusion of RSO was observed to enhance the films' hydrophobicity, as well as their overall physical and optical characteristics. Oxygen and water vapor transmission rates decreased with RSO addition, whereas carbon dioxide transmission rate remained largely unchanged. In particular, the water vapor transmission rate was reduced from 1.31 g/m2 & sdot;h in neat PVA films to 1.02 g/m2 & sdot;h in PVA/CMC/5RSO film. Furthermore, the antioxidant activity of the films increased markedly in a concentration-dependent manner, with moderate RSO incorporation providing effective radical scavenging, whereas neat films showed only minimal activity. Additionally, the active films demonstrated strong inhibition against gram-positive bacteria ( (Staphylococcus aureus) and moderate activity against gram-negative bacteria ( (Escherichia coli). Consequently, these innovative multicomponent film formulations were determined to be appropriate for deployment in active food packaging solutions.