scholarly journals Polyols Prepared from Ring-Opening Epoxidized Soybean Oil by a Castor Oil-Based Fatty Diol

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Jing Zhang ◽  
Ji Jun Tang ◽  
Jiao Xia Zhang
Keyword(s):  
Soybean Oil ◽  
Castor Oil ◽  
Ring Opening ◽  
Epoxidized Soybean Oil ◽  
Epoxy Ring ◽  
Molecular Weights ◽  
Molar Ratios ◽  
Epoxy Ring Opening ◽  
Ft Ir

Several biorenewable vegetable oil-based polyols with different molecular weights and various hydroxyl functionalities were successfully prepared by ring-opening epoxidized soybean oil with a castor oil-based fatty diol. It was found that several factors, including reaction time, reaction temperature, and molar ratios between epoxidized soybean oil and castor oil diol, affect structures and rheology behaviors of the final polyols. Proton NMR, FT-IR, GPC, and rheometry results revealed that the hydroxyl functionalities, molecular weight, and viscosity of the polyols could be tailored by controlling the above-mentioned factors. Besides, the role of solvents in the epoxy ring-opening process was investigated as well.

scholarly journals A Novel Green Synthesis Method of Poly (3-Glycidoxypropyltrimethoxysilane) Catalyzed by Treated Bentonite

2020 ◽  
Vol 15 (2) ◽  
pp. 290-303
Author(s):  
Nadia Embarek ◽  
Nabahat Sahli
Keyword(s):  
Ring Opening ◽  
Low Cost ◽  
Synthesis Method ◽  
Bulk Polymerization ◽  
Scanning Calorimetry ◽  
Epoxy Ring ◽  
Polymer Yield ◽  
Epoxy Ring Opening ◽  
Ft Ir

The present work focuses on the preparation and characterization of poly(3-Glycidoxypropyltrimethoxysilane) (PGPTMS) under mild conditions. Ring-opening polymerization of the 3-Glycidoxypropyltrimethoxysilane (GPTMS) is initiated with the bentonite of Maghnite-H+ (Mag-H+), an ecologic and low-cost catalyst. The evolution of epoxy ring-opening was studied in bulk and in solution using CH2Cl2 as solvent, as well as the influences of several factors such as the amount of Mag-H+, polymerization time and temperature on the yield of polymer were investigated. The best polymer yield (30 %) was obtained in bulk polymerization at room temperature (20 °C) for a reaction time 8 h, and it’s increases with time and reaches 68 % for 7 days. The structures of the obtained polymers (PGPTMS) were confirmed respectively by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance (NMR). The thermal properties of the prepared polymers were given by Differential Scanning Calorimetry (DSC) and thermogravimetric analysis (TGA), the Tg of PGPTMS is recorded at -31.27 °C, and it is thermally stable with a degradation start temperature greater than 300 °C, all  decomposition stopped at 600 °C. Copyright © 2020 BCREC Group. All rights reserved

scholarly journals INVESTIGATION OF BIOPLASTIC PROPERTIES DEVELOPED FROM ACRYLATE EPOXIDIZED SOYBEAN OIL THROUGH RING OPENING POLYMERIZATION PROCESS

1970 ◽  
Vol 1 (1) ◽  
pp. 29-41 ◽  
Author(s):  
Hiew Ming Yu ◽  
Arun Gupta ◽  
Ritu Gupta ◽  
Saad Bala Husain
Keyword(s):  
Mechanical Properties ◽  
Soybean Oil ◽  
Ring Opening ◽  
Unsaturated Fatty Acids ◽  
Ring Opening Polymerization ◽  
Epoxidized Soybean Oil ◽  
Polymerization Process ◽  
Synthesis And Characterization ◽  
Glycerol Concentration

Soybean oil is one of the major vegetable oils containing more than 99% of triglycerides of saturated and unsaturated fatty acids and has become an interesting source to produce bioplastic. This study investigates the synthesis and characterization of bioplastic developed by the acrylate epoxidized soybean oil through ring opening polymerization process. The mechanical properties of the samples were characterized using Fourier Transform Infrared Spectroscopy, Thermogravimetric analysis and the physio-chemical properties of the bioplastics were studied. In this study, the bioplastic made up from soybean oil with the lowest glycerol concentration showed the best mechanical properties.

scholarly journals GRAPHENE OXIDE AND A GO/ZnO NANOCOMPOSITE AS CATALYSTS FOR EPOXY RING-OPENING OF EPOXIDIZED SOYBEAN FATTY ACIDS METHYL ESTERS

2019 ◽  
Vol 36 (3) ◽  
pp. 1165-1173 ◽  
Author(s):  
Kaline A. Wanderley ◽  
Amanda M. Leite ◽  
Gabriel Cardoso ◽  
Anderson M. Medeiros ◽  
Caroline L. Matos ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Graphene Oxide ◽  
Ring Opening ◽  
Methyl Esters ◽  
Epoxy Ring ◽  
Epoxy Ring Opening

scholarly journals The Effect of Solvothermal Conditions on the Properties of Three-Dimensional N-Doped Graphene Aerogels

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 350 ◽  
Author(s):  
Alina Pruna ◽  
Alfonso Cárcel ◽  
Adolfo Benedito ◽  
Enrique Giménez
Keyword(s):  
Ring Opening ◽  
Operating Temperature ◽  
Three Dimensional ◽  
Low Density ◽  
Epoxy Ring ◽  
Graphene Aerogels ◽  
N Doping ◽  
Epoxy Ring Opening ◽  
Doped Graphene ◽  
Solvothermal Conditions

Low-density three-dimensional (3D) N-doped graphene aerogels by a one-step solvothermal method in the presence of ethylenediamine (EDA) are reported. The gelation, formation, and properties of the aerogels were studied with solvothermal conditions, namely, operating temperature, time, graphene oxide (GO) concentration, and the GO/EDA w/w ratio. Two ranges of solvothermal conditions are employed: one involving an operating temperature below 100 °C and a conventional chemical reduction of GO with EDA at atmospheric pressure and a second one employing a higher temperature range up to 165 and a high pressure reduction with EDA. The results show that both solvothermal approaches allow for the fabrication of homogeneous N-doped 3D graphene aerogels with density values close to 10 mg cm−3. The measurements indicated that low values of GO concentration, temperature, and EDA are optimum for obtaining low-density 3D aerogels. N doping is improved with an EDA amount in lower temperature conditions. The N doping mechanism below 100 °C is dominated by the epoxy ring opening while at temperatures up to 165 °C both epoxy ring opening and amidation take place. The CO2 adsorption properties are strongly controlled by the nitrogen configuration, namely, pyridinic nitrogen in terms of its density.

scholarly journals Tailored Crosslinking Process and Protective Efficiency of Epoxy Coatings Containing Glycidyl-POSS

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 591 ◽  
Author(s):  
Mirjana Rodošek ◽  
Mohor Mihelčič ◽  
Marija Čolović ◽  
Ervin Šest ◽  
Matic Šobak ◽  
...  
Keyword(s):  
Ring Opening ◽  
Protective Coatings ◽  
Diglycidyl Ether ◽  
Scanning Calorimetry ◽  
Protective Efficiency ◽  
Crosslinking Process ◽  
Operational Temperature ◽  
Epoxy Ring Opening ◽  
Ft Ir ◽  
Oligomeric Silsesquioxane

Versatile product protective coatings that deliver faster drying times and shorter minimum overcoat intervals that enable curing at faster line speeds and though lower energy consumption are often desired by coating manufacturers. Product protective coatings, based on silsesquioxane-modified diglycidyl ether of bisphenol-A (DGEBA) epoxy resin, are prepared through a glycidyl ring-opening polymerization using dicyandiamide (DICY) as a curing agent. As silsesquioxane modifier serves the octaglycidyl-polyhedral oligomeric silsesquioxane (GlyPOSS). To decrease the operational temperature of the curing processes, three different accelerators for crosslinking are tested, i.e., N,N-benzyl dimethylamine, 2-methylimidazole, and commercial Curezol 2MZ-A. Differential scanning calorimetry, temperature-dependent FT-IR spectroscopy, and rheology allow differentiation among accelerators’ effectiveness according to their structure. The former only contributed to epoxy ring-opening, while the latter two, besides participate in crosslinking. The surface roughness of the protective coatings on aluminum alloy substrate decreases when the accelerators are applied. The scanning electron microscopy (SEM) confirms that coatings with accelerators are more homogeneous. The protective efficiency is tested with a potentiodynamic polarization technique in 0.5 M NaCl electrolyte. All coatings containing GlyPOSS, either without or with accelerators, reveal superior protective efficiency compared to neat DGEBA/DICY coating.

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