The purpose of present study is in the direction of development of an anticorrosive coating formulation of high durability for carbon steel corrosion in 3 wt% NaCl medium. The formulation comprises of a macromolecular epoxy coating (DGEDDS‐MDA) based bisphenol S diglycidyl ether (DGEDDS) cured with a methylene dianiline (MDA). The formulation was characterized by FT‐IR spectroscopy method. Performance of the epoxy coating was represented using PDP and EIS approaches. The formulation acts as effective anticorrosive coating for long durability (180 days). Surfaces of the specimens before and after 180 days exposure to UV radiation were examined using SEM. PDP, SEM, and EIS studies showed that DGEDDS‐MDA acted as highly durable and effective anticorrosive formulation. Results also showed that the formulation acts as interface type inhibitor and its presence enhances the polarization resistance (Rp) value. DFT study suggests that the formulation DGEDDS‐MDA possesses strong ability to interact with metal surface through its several electron rich centers. MD and MC simulations showed that studied formulation effectively adsorb on the substrate (metallic surface). Results of EIS, PDP, and SEM studies (experimental) were well‐supported by DFT, MD, and MC (computational) simulations.
The quasi-one pot synthesis of new 2-aminopyrido[1,2-a][1,3,5]triazin-4-ones starting from 2-aminopyridine and 2-aminopicolines is herein described in order to obtain a library of cyclic guanidines.
Unsaturated polyester resins (UPRs) are commonly used as matrix resins for fiber-reinforced composites. During processing, the resins undergo a molecular cross-linking process called curing, during which they change irreversibly from viscous liquids to rigid and highly cross-linked polymer solids. The gelation time is critical for the success of a resin system, but it is difficult to measure accurately. It depends on several parameters. In this study, the parameters investigated are the effect of choice and their relative proportions. Parameters such as catalyst, accelerators, inhibitor, and fillers were examined. Various combinations of catalyst, accelerator, inhibitor, temperature and filler were analyzed to investigate the effect on the gel time of the unsaturated polyester resins. Then, this review assembles the scientific data on the gelation of unsaturated polyester resins to help readers better understand this process. Students, researchers, technologists, engineers, and chemists involved in the technology of synthesizing these monomers and polymers will benefit from this material.
The goal of this research is to investigate the impact of the three parameters on the cure of the unsaturated polyester resin. The obtained values show the influence of each parameter on the cure and hence enables to establish a time-range with regard of the percentage of the components for a good management of the curing process.
The paper aims to evaluate the gel time and exotherm temperature properties of the curing of unsaturated polyester resin at various amounts of Methyl ethyl ketone peroxide, cobalt octoate and porcelain powder. The gel time of samples are determined using the simple method, while the exotherm temperature are evaluated using the thermocouple. The variation of these properties is discussed theoretically and experimentally.
A straightforward approach to novel 2-dialkylamino-4H-pyrido[1,2-a][1,3,5]triazin-4-ones synthesis is presented. The construction of these compounds was achieved by one-pot synthesis involving condensation of 2-aminopyridine or 2-aminopicolines with ethoxycarbonylisothiocianate, followed by amination of the thioureas, and finally thermal ring closure of resulting guanidines. This allowed access to the unreported title heterocycles. We described an efficient, facile, one-pot synthesis of a novel 2-dialkylamino-4H-pyrido[1,2-a][1,3,5]triazin-4-ones in order to obtain a library of pyridotriazines which will be used as building blocks in medicinal chemistry.
Triazine derivativesTriazine derivatives R 0655 A Versatile Synthesis of 2-Amino-4H-pyrido[1,2-a][1,3,5]triazin-4-ones from 2-Aminopyridines. -A quasi-one pot synthesis of new 2-amino-4H-pyrido[1,2-a][1,3,5]triazin-4-ones [cf. (V), 11 examples] from 2-aminopyridines is presented. -(KOPP, M.; LANCELOT, J.-C.; DAGDAG, S.; MIEL, H.; RAULT*, S.; J.
Suzuki cross coupling reaction is one of the most famous organic reactions of the 20th century’s chemistry. It is deemed of as one of the most famous reaction in the field of chemistry. It is a very effective method for making carbon–carbon bonds. It has been extensively utilized in the synthesis of many carbon molecules including the most complex ones.Syntheses of 2-diethylamino-4H-7-(Het) aryl pyrido [1,2-a] [1,3,5] triazin-4-ones are currently under investigation in order to obtain great potentialities in medicinal chemistry of compounds class. The methodology we propose herein is able to produce numerous 2-diethylamino-4H-7-(Het)arylpyrido[1,2-a][1,3,5]triazin-4-one and derivatives that were synthesized, purified and characterized by 1HNMR, 13CNMR, MS techniques. Furthermore, it allows sequential introduction of various substituents into a 2-alkylylamino-4H-7-(Het)arylpyrido[1,2-a][1,3,5]triazin-4-ones ring using a one-pot procedure. The biological evaluation as well as the physico-chemical characterisation of various products are currently under way and will be described elsewhere.
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