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Relevant bibliographies by topics / Oxirane Content

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Journal articles

Academic literature on the topic 'Oxirane Content'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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Journal articles on the topic "Oxirane Content"

1

Perez-Arce, Jonatan, Ander Centeno-Pedrazo, Jalel Labidi, Jose R. Ochoa-Gomez, and Eduardo J. Garcia-Suarez. "Lignin-Based Polyols with Controlled Microstructure by Cationic Ring Opening Polymerization." Polymers 13, no. 4 (2021): 651. http://dx.doi.org/10.3390/polym13040651.

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Lignin-based polyols (LBPs) with controlled microstructure were obtained by cationic ring opening polymerization (CROP) of oxiranes in an organosolv lignin (OL) tetrahydrofuran (THF) solution. The control on the microstructure and consequently on the properties of the LBPs such as hydroxyl number, average molecular weight, melting, crystallization and decomposition temperatures, are crucial to determine the performance and application of the derived-products. The influence of key parameters, for example, molar ratio between the oxirane and the hydroxyl groups content in OLO, initial OL concent

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2

Musik, Marlena, Eugeniusz Milchert, and Kornelia Malarczyk-Matusiak. "Technological Parameters of Epoxidation of Sesame Oil with Performic Acid." Polish Journal of Chemical Technology 20, no. 3 (2018): 53–59. http://dx.doi.org/10.2478/pjct-2018-0038.

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Abstract The course of epoxidation of sesame oil (SO) with performic acid formed „in situ” by the reaction of 30 wt% hydrogen peroxide and formic acid in the presence of sulfuric acid(VI) as a catalyst was studied. The most advantageous of the technological independent parameters of epoxidation are as follows: temperature 80°C, H2O2/ C=C 3.5:1, HCOOH/C=C 0.8:1, amount of catalyst as H2SO4/(H2O2+HCOOH) 1 wt%, stirring speed at least 700 rpm, reaction time 6 h. The iodine number (IN), epoxy number (EN), a relative conversion to oxirane (RCO) and oxirane oxygen content (EOe) were determined every

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3

Jalil, Mohd Jumain, Noorfazlida Mohamed, Siti Khatijah Jamaludin, Ayub M. Som, and Ahmad Rafizan Mohamad Daud. "Epoxidation of Palm Kernel Oil-Based Crude Oleic Acid." Advanced Materials Research 906 (April 2014): 125–30. http://dx.doi.org/10.4028/www.scientific.net/amr.906.125.

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Most vegetable oils have high content of unsaturated bond and can be converted into epoxidized fatty acids. These days, epoxidized vegetable oils are great concern as they are obtained from sustainable, renewable natural resources and are environmental friendly. The epoxidation of palm oleic acid was carried out by using in situ generated performic acid (HCOOOH) to produce epoxidized oleic acid. The degree of temperature, the molar ratio of formic acid or hydrogen peroxide and types of catalyst was considered. Epoxidation results were based on complete conversion oxirane, rate of epoxidation a

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4

Bakhtin, S.G., and A.V. Charyarov. "SPECTROPHOTOMETRIC DETERMINATION OF THE CONCENTRATION AND NUCLEOPHILICITY OF QUATERNARY AMMONIUM AND PHOSPHONIUM SALTS BASED ON THE REACTION OF NUCLEOPHILIC OPENING OF THE EPOXIDE RING." Bulletin of Donetsk National University. Series А. Natural Sciences, no. 4 (December 3, 2024): 26–32. https://doi.org/10.5281/zenodo.14276568.

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A new spectrophotometric method for determining the content of tetraalkylammonium or phosphonium salts is proposed, based on the chromogenic S<sub>N</sub>2 reaction of oxirane ring opening in the systems "epoxide – salt R<sub>4</sub>N<sup>+</sup><strong>X</strong><sup>–</sup> or R<sub>4</sub>P<sup>+</sup><strong>X</strong><sup>–</sup> – proton donor reagent". Formal kinetic patterns of the epoxide ring opening reaction in the proposed systems are investigated. <strong><em>Keywords:</em></strong><strong> </strong>tetraalkylammonium, tetraalkylphosphonium, oxirane, epoxid

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5

Neswati, N. Nazir, S. Arief, and Yusniwati. "Combination of temperature and time of oxirane rings opening reaction for producing palm oil polyol as raw material of flexible polyurethane foam." IOP Conference Series: Earth and Environmental Science 1059, no. 1 (2022): 012077. http://dx.doi.org/10.1088/1755-1315/1059/1/012077.

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Abstract Flexible polyurethane foams can be synthesized using polyols having a hydroxyl value of less than 100 mg KOH/g. The value of the hydroxyl value is affected by the temperature and time of the oxirane rings opening reaction. The purpose of this study was to examine the combination of temperature and time of the best oxirane rings opening reaction to produce polyols with a hydroxyl value of less than 100 mg KOH/g. Epoxidized palm oil was treated with temperature (50°C, 60°C, 70°C, and 80°C) and time (1 hour, 2 hours, 3 hours, and 4 hours). Parameters observed were hydroxyl value, hydroxy

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6

Derawi, Darfizzi, and Jumat Salimon. "Optimization on Epoxidation of Palm Olein by Using Performic Acid." E-Journal of Chemistry 7, no. 4 (2010): 1440–48. http://dx.doi.org/10.1155/2010/384948.

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The epoxidation process of palm olein (POo) was carried out by usingin situgenerated performic acid (HCOOOH) to produce epoxidized palm olein (EPO). HCOOOH was produced by mixing of formic acid (HCOOH) as oxygen carrier and hydrogen peroxide (H2O2) as oxygen donor in various ratio of POo: HCOOH: H2O2. The effect of HCOOH and H2O2concentration, temperature, stirring effect and reaction time were studied. The presence of oxirane ring of EPO was characterised by fourier transformation infra-red (FTIR), proton and carbon nuclear magnetic resonance (1H-NMR and (13C-NMR) spectra. The results showed

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7

Thuy, Nguyen Thi, Nguyen Thanh Liem, and Vu Minh Duc. "Epoxidation of soybean oil by using Na₂WO₄/H₂O₂/H₃PO₄ based catalyst." Vietnam Journal of Chemistry 60, no. 3 (2022): 398–406. http://dx.doi.org/10.1002/vjch.202100216.

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AbstractThis paper presents epoxidation using a Na2WO4/H2O2/H3PO4‐based complex catalyst, which is formed from in aqueous phase in situ during the process. The success of the epoxidation was demonstrated by the FTIR investigation results. A variety of factors such as reaction conditions, reactant and composition of catalyst system that influence the epoxidation reaction was examined through the oxirane content, yield, conversion, and catalyst selectivity. In which, the rate of addition of reactants as well as the catalytic complex is one of the influencing factors studied. The optimal ratio of

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8

Hambali, R. A., M. A. Faiza, and A. Zuliahani. "Non-Isocyanate Polyurethane (NIPU) based on Rubber Seed Oil Synthesized via Low-Pressured Carbonization Reaction." Sains Malaysiana 50, no. 8 (2021): 2407–17. http://dx.doi.org/10.17576/jsm-2021-5008-22.

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Epoxidised rubber seed oil (ERSO) was successfully synthesized into non-isocyanate polyurethane via carboxylation method whereas peroxoformic acid was formed by in-situ reaction for epoxidation. The effects of temperature and ratio of hydrogen peroxide and formic acid to rubber seed oil carboxylation were studied. The optimum temperature for the epoxidation reaction was found at 50 °C to avoid ring opening reaction of epoxy whilst the optimum ratio of hydrogen peroxide and formic acid is equal molar of double bond: formic acid at 1:2 and 1:1, respectively. At a lower concentration of hydrogen

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9

Silva, Juliana, Aline Faria, Geraldo Oliveira, and Fernando Lage. "ANÁLISE COMPARATIVA ENTRE COMPÓSITOS REFORÇADOS COM BAGAÇO DE CANA-DE-AÇÚCAR PRODUZIDOS A PARTIR DE ÓLEO DE SOJA EPOXIDADO COMERCIAL E ÓLEO DE SOJA PROVENIENTE DE FRITURAS." LUMEN ET VIRTUS 15, no. 43 (2024): 9245–57. https://doi.org/10.56238/levv15n43-117.

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Commercial epoxy is produced from petroleum derivatives and is widely used as a matrix in the production of composites due to its simple processing. Epoxidized soybean oil makes it possible to produce a more sustainable matrix. With a view to sustainability, the present work aims to produce composite materials produced from commercial epoxidized soybean oil and epoxidized residual frying soybean oil. The characterization of the epoxidized oils was carried out by determining the oxirane oxygen content (OOe), infrared spectroscopy by Fourier transform and tensile test. As epoxidized soybean oils

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10

Yenni Listiana, Hilde Rosa Tampubolon, and Mersi Suriani Sinaga. "PENGARUH KONSENTRASI KATALIS DAN WAKTU REAKSI PADA PEMBUATAN EPOKSI MINYAK GORENG BEKAS." Jurnal Teknik Kimia USU 6, no. 3 (2017): 28–33. http://dx.doi.org/10.32734/jtk.v6i3.1586.

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Epoxy is produced from an epoxidation of vegetable oil or natural oil with au nsaturated bond. Epoxy can be applied as a stabilizer, plasticizers in polyvinyl chloride (PVC) and can be used as an antioxidant in natural rubber processing, as a surfactant, anti-corrosive additive agent in lubricants and pesticide raw materials. The purpose of this research was to evaluate epoxy production from waste cooking oil. In this research, waste cooking oil was reacted with hexane as solvent, sulfuric acid as catalyst, glacial acetic acid and hydrogen peroxide. The catalyst concentration was varied from 1

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