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Öğe COMPARISON OF SOME WOOD PROPERTIES OF JUVENILE BLACK PINES OF DIFFERENT ORIGIN PLANTED IN THE SAME HABITAT(Universidad del Bio-Bio, 2021) Arslan, M. B.; Avcı, E.; Tozluoğlu, A.; Birtürk, T.; Saraçbaşı, A.; Örtel, E.Black pine (Pinus nigra) is a significant raw material source for the forest products industry in Turkey. The purpose of this research was to study some chemical, anatomical, physical, and mechanical properties of wood obtained from juvenile black pines planted in Kavaklıdere - Muğla, originating from five different locations: Muğla, Balıkesir, Denizli, Bursa, and Kütahya. Although pines originating from Muğla and Balıkesir were good in terms of wood properties, those from Denizli, Bursa, and Kütahya exhibited no remarkable features. Black pine of Muğla origin was recommended for planting in Kavaklıdere and similar habitats, whereas pines of Denizli, Bursa, and Kütahya origins were not recommended. However, pine of Balıkesir origin may be an alternative to that of Muğla origin for black pine plantations at Kavaklıdere and similar sites. © 2021. All Rights Reserved.Öğe The effect of different enzymatic pretreatment processes on the production of nanocellulose from wheat straw(Gazi Universitesi, 2023) Sertkaya, S.; Arslan, R.; Tozluoğlu, A.; Fidan, H.; Erol, Ö.; Ünal, H.İ.; Candan, Z.Nanocellulose is an important material in the field of forest products with its application potential which can be obtained from lignocellulosic raw materials such as roots, stems, straw, leaves and bark. It emerges as a result of agricultural activities and gives positive effects on the final products obtained due to its physical, chemical, and morphological properties. Compared to the alkaline or acidic production method, which is frequently used as a nanocellulose production method in the literature, the enzymatic hydrolysis method has been less studied. In general, cellulose nanofibrils (CNF) are produced by nanocellulose production processes via enzymatic hydrolysis, while crystalline nanocelluloses (CNC) are produced by non-enzymatic processes. In this study, CNF was obtained by two different enzymatic pretreatments (hemicellulase Pulpzyme HC 2500 and cellulase Celluclast 1.5 L commercial enzymes) followed by homogenization on soda-NaBH4 bleached pulp fibers obtained from wheat straw for the first time and the changes in chemical, morphological, thermal, and rheological properties the CNF obtained after the homogenization process were investigated. HPLC analyses performed after enzymatic pretreatment showed that more carbohydrates were removed from the structure at increasing enzyme concentrations, and SEM images taken after homogenization under high pressure showed that the fibers were homogeneously reduced to nano size (average fiber diameter of 20-50 nm) in CNF production. © 2023 Gazi Universitesi Muhendislik-Mimarlik. All rights reserved.Öğe Effect of Size Press Coating of Cationic Starch/ Nanofibrillated Cellulose on Physical and Mechanical Properties of Recycled Papersheets(North Carolina State University, 2023) Tozluoğlu, A.; Fidan, H.This study aimed to evaluate the effect of size press coating on two types of recycled papers using different types of nanofibrillated cellulose (NFC) and cationic starch (CS) on physical and mechanical properties. Wheat straw was used as a cellulose source, and NFC was obtained through oxidative and enzymatic pretreatments. Recycled fluting and coreboard papers were coated with cationic starch/NFC blends at various concentrations of NFC (0.5%, 1%, 2%, 3%, and 4%) using a three-time repetitive size press application, followed by one-time drying section, and compared to uncoated papers. The application of a coating suspension containing 4% periodate-oxidized NFC on both paper surfaces resulted in a significant improvement in the tensile index, burst index, and internal bond strength of the papersheets, with increases of up to 60.6%, 96.3%, and 119.9%, respectively. Furthermore, significant decreases in air permeability were also observed with reductions of 75% and 81.6% for coreboard and fluting papers, respectively. Compared to other pretreatment methods, periodate oxidation resulted in higher viscosity values in NFC samples. Therefore, the application of periodate-oxidized NFC with a size press resulted in a significant improvement in the mechanical and barrier properties of papers made from recycled pulps. © 2023, North Carolina State University. All rights reserved.Öğe Potential Use of Nanofibrillated Cellulose-loaded Cationic Starch Solutions as Coating Formulation for Recycled Fluting Papers(North Carolina State University, 2024) Tozluoğlu, A.Effects of cellulose nanofibers (CNF) and cationic starch (CS) were evaluated as coating components relative to the physical and mechanical properties of fluting papersheets fabricated from recycled corrugated cardboard fibers. Fabricated fluting papers were subjected to size press applications by three different coating blends. Coating suspensions were prepared at various concentrations of CNF (0.5%, 1%, 2%, 3%, and 4%) and 4 wt% CS, and the same amounts of CS/CNF. The paper sheets were fabricated using size press machine as three-time repetitive applications, followed by one-time drying section, and compared to uncoated, CS-coated, and CNF-coated papers. The application of CNF suspensions increased tensile indices up to 11.7%. Moreover, CS/CNF suspensions resulted in a 67.2% increase in tensile index values. The coating of CS/CNF suspensions increased the burst index values by 163% at the CS+1%CNF concentration when compared to the control pulp. Surface application of prepared suspensions reduced the porosity of the samples under all conditions. The highest reduction in the air permeability was observed in the CS+4%CNF-coated samples as 91.5%. It can be concluded that the superficial applications of CNF on the physical and mechanical properties of recycled fluting paper was more effective in the presence of CS. © 2024, North Carolina State University. All rights reserved.
