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Найденный: 8 Экземпляр 0.000 sn
Базы данных : Scopus ✕Тематический рубрикатор : NMR ✕
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Synthesis, characterization and coating properties of carboxymethyl cellulose from sock production wastes

Nurzat ŞAYKİYEVA | Kubat KEMELOV | Mirlan MOLDOBAYEV | Canıl İSKAKOVA | Mustafa DOLAZ

This study aims to evaluate and reuse defective products and cotton wastes resulting from factories producing socks in Bishkek, Kyrgyzstan, in order to solve the issues related to their disposal. For this purpose, microcrystalline cellulose (MCC) was obtained after isolating the cellulose from these wastes by treating them with sulfuric acid solutions. Then, under constant NaOH and monochloroacetic acid (MCA), CMC with the highest DS value of (0.65) was synthesized at 65 degrees C for 2 hours. When the reaction time was increased (3, 4 and 5 hours) at the same temperature, the DS value decreas ...Более

Статья 2023 Mühendislik Fakültesi Cellulose Chemistry and Technology57 ( 3-4 ) 50 Просмотры
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Synthesis, Characterization, and Investigation of Coating Properties of Carboxymethyl Acorn Starch (CMAS)

Nurzat ŞAYKİYEVA | Mirlan MOLDOBAYEV | Kubat KEMELOV | Canıl İSKAKOVA | Mustafa DOLAZ

Kyrgyzstan is a landlocked country in Central Asia, famous for its crystal-clear lakes, majestic Tien Shan Mountains that bisect the territory of Turkistan, and magnificent natural beauty. This study aims to evaluate the fruit (acorns) of the oak trees (Quercus robur L.) grown in Bishkek, the capital city of Kyrgyzstan. For this purpose, carboxymethyl acorn starch (CMAS), which is not synthesized in literature, is first synthesized by isolating acorn starch (AS) from the acorns. The structures of CMASs are characterized by H-1(C-13)-NMR, FT-IR, XRD, and SEM techniques. The viscosities of the s ...Более

Статья 2023 Mühendislik Fakültesi Starch-Starke75 ( 9-10 ) 37 Просмотры
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Three novel 1,2,3-triazole-fused compounds: Syntheses, structural and spectroscopic characterizations with molecular modeling

Ferhan TÜMER

In this study, we report syntheses, structural and spectroscopic characterizations, and molecular modeling of three novel triazole fused compounds: 4-((4-methoxyphenoxy)methyl)-1-(4-methoxyphenyl)-1H-1,2,3-triazole, 1-(4-isopropylphenyl)-4-((4-methoxyphenoxy)methyl)-1H-1,2,3-triazole, and 1-(4-fluorophenyl)-4-((4-methoxyphenoxy)methyl)-1H-1,2,3-triazole. Their molecular structures and intermolecular interactions were elucidated using single-crystal X-ray crystallography. The compounds crystallize in the P-1 and P21/c space groups with weak C−H∙∙∙N and C-H∙∙∙O interactions. Hirshfeld surface an ...Более

Статья 2023 Mühendislik Fakültesi Journal of Molecular Structure1299 17 Просмотры
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LABORATORY SCALE PRODUCTION OF HYDROXYPROPYLMETHYLCELLULOSE (HPMC) IN A GAS-TIGHT REACTOR UNDER PRESSURE AND ITS APPLICATION IN CEMENT PASTE

Mustafa DOLAZ

Unfortunately, cellulose, which is the most abundant of natural polysaccharides in the world, and is found in high amounts in cotton and the waste/by-products of textile factories, cannot be recycled sufficiently. As an attempt to find a solution to this problem, in this study, a by-product of the towel production process, called towel clippings (TC), was used as a source of cellulose for obtaining HPMC. HPMC was synthesized for the first time from the reaction of cellulose, propylene oxide (PO) and chloromethane (CM) under pressure in a gas-tight laboratory scale reactor and then evaluated as ...Более

Статья 2022 Mühendislik Fakültesi Cellulose Chemistry and Technology56 ( 5-6 ) 89 Просмотры
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The Oxidation Behavior of Potato Starch and Benzyl Alcohol via Peroxide in the Catalysis of Metal Complexes

Mustafa DOLAZ

Two new Schiff bases ligands (HL1 and HL2) and their Co2, Mn2, Fe3, Ru3, Cr3, and VO2 complexes were synthesized and characterized by FT-IR, 1H-NMR, and Mass spect. and analytical methods. A single-crystal X-ray diffraction study determined the molecular structure of HL1. The catalytic effects of metal complexes on benzyl alcohol and potato starch (PS) oxidation were compared in an H-2O-2 medium. The percent conversion of benzyl alcohol to benzaldehyde and benzoic acid was determined by Gas Chromatography. [Co(L-1)(2)], [Mn(L-1)(2)], [Co(L-2)(2)], and [Mn(L-2)(2)] showed the highest catalytic ...Более

Статья 2022 Mühendislik Fakültesi Starch-Starke8 ( 9 ) 60 Просмотры
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Synthesis and Characterization of Hydroxypropyl Acorn Starch (HPAS) From Oak Acorn

Mustafa DOLAZ

The utilization of forest auxiliary products and their conversion into products with higher added value is important for the use of renewable resources. For this purpose, acorns belonging to the Q. coccifera species were collected in November, which is their ripening period, and dried and ground in the laboratory. Then, acorn starch (AS) was isolated from the sieved acorn flour. For 5 g of this isolated AS, hydroxypropyl acorn starch (HPAS) with the highest molar substitution (MS = 0.319) was synthesized by optimizing at 45 degrees C for 5 h with 30 g of propylene oxide and 1.88 g of NaOH. The ...Более

Статья 2021 Mühendislik Fakültesi Journal of Polymers and the Environment29 ( 7 ) 126 Просмотры
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RECOVERING OF INDIGO DYE FROM DENIM WASTEWATER WITH H2O2 IN THE PRESENCE OF KI CATALYST

Mustafa DOLAZ

Today, the textile industry, which is rapidly developing and growing in proportion to the human population, poses serious environmental and health problems in terms of waste. In the world, indigo dyes are widely used in the manufacturing of jeans fabrics especially in textile factories producing cotton fabrics. The overall objective of the present study is to recover indigo dye which is referred to as the pollutant released into the wastewater and to assess the removal of color via oxidation. For this purpose, denim wastewater containing solid particles and small size cotton fibers was filtere ...Более

Статья 2021 Mühendislik Fakültesi Environmental Engineering and Management Journal20 ( 9 ) 67 Просмотры
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Synthesis and Characterization of Hydroxyethyl Starch from Chips Wastes Under Microwave Irradiation

Mustafa DOLAZ

This article focuses on the synthesis of hydroxyethyl potato starch (HEPS) for liquid hand soap by evaluating waste potato starch (WPS), a byproduct in potato chips production. It is a cheap, biodegradable, non-toxic and renewable natural polymer, available in great quantities on a global level. In a factory producing potato chips, WPS, which remained in the aqueous medium during peeling, slicing, and washing the potatoes, was purified at the desired temperature with H2O2 and NaOH. HEPSs with the molar substitution (MS) in the range from 0.298 to 0.670, were synthesized under microwave irradia ...Более

Статья 2020 Mühendislik Fakültesi Journal of Polymers and the Environment29 ( 3 ) 82 Просмотры
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