scholarly journals Chemical Modification of ED-24 Epoxy Resin Peroxy Derivative by C9H4F16O Fluorine-Containing Alcohol-Telomer

2010 ◽  
Vol 4 (2) ◽  
pp. 125-130 ◽  
Author(s):  
Michael Bratychak ◽  
◽  
Taras Chervinskyy ◽  
Olena Shust ◽  
Olena Shyshchak ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Chemical Modification ◽  
Epoxy Resin ◽  
Catalytic System ◽  
Reaction Rate ◽  
Process Time ◽  
Catalyst Amount ◽  
Active Additive

The possibility of chemical modification of ED-24 epoxy resin peroxy derivative (PDER) by C9H4F16O fluorine-containing alcohol-telomer (FAT-C9) has been shown using 18-Crown and ZnCl2 catalytic system. The effect of catalyst amount, temperature and process time on the reaction rate has been studied. New peroxy oligomer containing fluorine atoms (FPO) has been synthesized and characterized. The FPO structure has been confirmed by IR-spectroscopy. It has been proposed to use FPO as an active additive to the polymeric mixes based on ED-20 industrial epoxy resin and TGM-3 oligoesteracrylate.

scholarly journals Production of Bitumen Modified with Low-Molecular Organic Compounds from Petroleum Residues. 3. Tar Modified with Formaldehyde

2021 ◽  
Vol 15 (4) ◽  
pp. 608-620
Author(s):  
Volodymyr Gunka ◽  
◽  
Yuriy Prysiazhnyi ◽  
Yurii Hrynchuk ◽  
Iurii Sidun ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Hydrochloric Acid ◽  
Ir Spectroscopy ◽  
Chemical Modification ◽  
Organic Compounds ◽  
Group Composition ◽  
Process Time ◽  
Structural Group ◽  
Brittle Point ◽  
Structural Group Composition

The chemical modification of tar with formaldehyde as 37% aqueous solutionhas been studied in the presence of the catalysts. Hydrochloric acid, sulfuric acid, sodium hydroxide and acid tar were used as the catalysts. The effect of the catalyst nature and amount, as well as temperature, process time and initial components ratio on the softening point, penetration, brittle point and adhesion to crushed stone has been determined. The structure of the modified tars was confirmed by IR spectroscopy. The structural-group composition was determined. Arene-formaldehyde resins have been synthesized on the basis of toluene and modified tars using hydrochloric acid as a catalyst. The synthesized resins were characterized using IR spectroscopy. The chemistry of the tar modification with formaldehyde has been proposed.

scholarly journals Chemical Modification of Dianic Epoxy Resin by Fluorine-Containing Alcohols

2009 ◽  
Vol 3 (3) ◽  
pp. 191-196
Author(s):  
Michael Bratychak ◽  
◽  
Olena Shust ◽  
Olena Astakhova ◽  
Olena Shyshchak ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Chemical Modification ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Catalyst System ◽  
Benzyltriethylammonium Chloride

New epoxy resins with fluorine atoms have been synthesized via chemical modification of dianic epoxy resin with fluorine-containing alhocols-telomers C7, C9 and C13, using benzyltriethylammonium chloride and KOH as a catalyst system. Their characteristics have been examined. The structure of synthesized products has been confirmed by IR-spectroscopy. It has been shown that new epoxy resins may be used as active plasticizers for industrial epoxy resin.

scholarly journals Monitoring the Interfacial Polymerization of Piperazine and Trimesoyl Chloride with Hydrophilic Interlayer or Macromolecular Additive by in-situ FT-IR Spectroscopy

2019 ◽  
Author(s):  
Xi Yang
Keyword(s):  
Ir Spectroscopy ◽  
Reaction Rate ◽  
Interfacial Polymerization ◽  
Reaction System ◽  
Reaction Rates ◽  
Water Permeation ◽  
Ft Ir ◽  
Trimesoyl Chloride ◽  
Ft Ir Spectroscopy

The interfacial polymerization (IP) of piperazine (PIP) and trimesoyl chloride (TMC) has been extensively utilized to synthesize the nanofiltration (NF) membrane. However, it is still a huge challenge to monitor the IP reaction, because of the fast reaction rate and the formed ultra-thin film. Herein, two effective strategies are applied to reduce the IP reaction rate: (1) the introduction of hydrophilic interlayers between the porous substrate and the formed polyamide layer; (2) the addition of macromolecular additives in the aqueous solution of PIP. As a result, in-situ FT-IR spectroscopy was firstly used to monitor the IP reaction of PIP/TMC reaction system, with hydrophilic interlayers or macromolecular additives. Moreover, we study the formed polyamide layer growth on the substrate, in a real-time manner. The in-situ FT-IR experimental results confirm that the IP reaction rates are effectively suppressed and the formed polyamide thickness reduces from 138±24 nm to 46±2 nm. Furthermore, the optimized NF membrane with excellent performance are consequently obtained, which include the boosted water permeation flux about 141~238 (L·m2·h/MPa) and superior salt rejection of Na2SO4 > 98.4%.

scholarly journals Preparation of 1-Hydroxy-2,5-hexanedione from HMF by the Combination of Commercial Pd/C and Acetic Acid

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2475 ◽  
Author(s):  
Yanliang Yang ◽  
Dexi Yang ◽  
Chi Zhang ◽  
Min Zheng ◽  
Ying Duan
Keyword(s):  
Aqueous Solution ◽  
Acetic Acid ◽  
Reaction Time ◽  
Catalytic System ◽  
Biomass Conversion ◽  
High Concentration ◽  
Influence Of Temperature ◽  
Catalyst Amount

The development of a simple and durable catalytic system for the production of chemicals from a high concentration of a substrate is important for biomass conversion. In this manuscript, 5-hydroxymethylfurfural (HMF) was converted to 1-hydroxy-2,5-hexanedione (HHD) using the combination of commercial Pd/C and acetic acid (AcOH) in water. The influence of temperature, H2 pressure, reaction time, catalyst amount and the concentration of AcOH and HMF on this transformation was investigated. A 68% yield of HHD was able to be obtained from HMF at a 13.6 wt% aqueous solution with a 98% conversion of HMF. The resinification of intermediates on the catalyst was characterized to be the main reason for the deactivation of Pd/C. The reusability of the used Pd/C was studied to find that most of the activity could be recovered by being washed in hot tetrahydrofuran.

Chemical modification of starch with epoxy resin to enhance the interfacial adhesion of epoxy-based glass fiber composites

RSC Advances ◽  
2016 ◽  
Vol 6 (87) ◽  
pp. 84187-84193 ◽  
Author(s):  
Ying Wang ◽  
Hui Li ◽  
Xiaodan Wang ◽  
Hong Lei ◽  
Jichuan Huo
Keyword(s):  
Thermal Properties ◽  
Chemical Modification ◽  
Glass Fiber ◽  
Epoxy Resin ◽  
Interfacial Adhesion ◽  
Glass Fibers ◽  
Fiber Composites ◽  
Mechanical And Thermal Properties ◽  
Glass Fiber Composites ◽  
Chemically Modified

In order to fabricate epoxy-based glass fiber composites with superior mechanical and thermal properties, starch was chemically modified by E-51 epoxy resin, as a sizing for glass fibers.

Modeling of the Formation Process of the Coherent Intermetallides in Nickel Alloys during Laser Treatment

2019 ◽  
Vol 822 ◽  
pp. 438-444 ◽  
Author(s):  
Andrey V. Alekseev ◽  
Ekaterina A. Valdaitseva ◽  
Vladimir L. Aleksandrov
Keyword(s):  
Laser Treatment ◽  
Reaction Rate ◽  
Treatment Process ◽  
Reaction Rate Constant ◽  
Process Time ◽  
Al Alloy ◽  
Chemical Reaction Rate Constant ◽  
Intermetallic Inclusion ◽  
Laser Cladding Process ◽  
New Phase

A solution for new phase inclusion growth is suggested for the case of the Ni-based alloys. This solution takes into account a chemical composition of the alloy and conditions of the laser treatment process. A method for calculation of the chemical reaction rate constant is also suggested for the Ni3Al formation in the Ni-Al alloy. Modeling is fulfilled for the laser cladding process. Time dependences for the reacting component concentration is obtained as well as for intermetallic inclusion growth and thermal cycle.

Radiation-Chemical Modification of PVDF Films as a Method of Creating Proton-Conducting Membranes

2016 ◽  
Vol 683 ◽  
pp. 193-198 ◽  
Author(s):  
Valentina Sokhoreva ◽  
Natalya A. Dubrova ◽  
Akbota Dyussembekova
Keyword(s):  
Ir Spectroscopy ◽  
Chemical Modification ◽  
Radiation Source ◽  
Gravimetric Analysis ◽  
Radiation Chemical ◽  
Proton Conducting ◽  
Conductive Membranes ◽  
Conducting Membranes

In this work we represent the results for the development of proton conductive membranes by radiochemical modification of thin PVDF films with their subsequent sulfonation. Radiation source were 4He ions with energy of 27 MeV produced by cyclotron R-7M the FTI TPU. The results of IR-spectroscopy, gravimetric analysis and microscopy are represented to evaluate changes in membranes properties. It was shown that the deepness of modificated gel can be controlled by radiation.

scholarly journals Preparation and Properties of Autocatalytic Biobased Waterborne Polyol from Rosin Based Epoxy Resin

2022 ◽  
Author(s):  
Guomin Wu ◽  
Jian Chen ◽  
Zhaozhe Yang ◽  
Can Jin ◽  
Guifeng Liu ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Tertiary Amine ◽  
Reaction Rate ◽  
Waterborne Polyurethane ◽  
Crosslinking Reaction ◽  
Forming Process ◽  
Waterborne Coatings ◽  
Ft Ir ◽  
Amine Groups ◽  
Heterogeneous Film

Abstract Due to the complex heterogeneous film forming process of two-component waterborne polyurethane (2K-WPU), the crosslinking reaction rate of 2K-WPU cannot meet the demand of efficient application in coatings. In order to improve the crosslinking reaction rate of 2K-WPU, a waterborne polyol containing tertiary amine groups was synthesized from rosin based epoxy resin and secondary amine compound, and then autocatalytic 2K-WPU was prepared by crosslinking the rosin based waterborne amino polyol with polyisocyanate. The structure of the polyol from rosin based epoxy resin was characterized with Fourier infrared (FT-IR) and nuclear magnetic resonance (NMR). The crosslinking kinetics and the crosslinked product of the rosin based waterborne amino polyol were also compared with a commercial acrylic polyol. It was shown from the results that the crosslinking reaction rate of the rosin based waterborne amino polyol was faster than that of the commercial acrylic polyol, which indicated the tertiary amine groups chemically bonded in the rosin based polyols could autocatalyze the crosslinking reaction of 2K-WPUs with catalysts free. The film of the rosin based waterborne amino polyol had excellent impact strength, adhesion, flexibility, hardness, gloss, fullness and solvent resistance, showing a good application prospect in the field of waterborne coatings.

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