Bibliografias temáticas / Cyclocarbonates

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Literatura científica selecionada sobre o tema "Cyclocarbonates"

Autor: Grafiati
Publicado: 23 de novembro de 2024

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Artigos de revistas sobre o assunto "Cyclocarbonates"

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Hudzenko, N. V., V. K. Grishchenko, A. V. Barantsova, N. A. Busko e Z. V. Falchenko. "Cyclic carbonates of rapeseed methyl esters as monomers for urethane composites". Voprosy Khimii i Khimicheskoi Tekhnologii, n.º 2 (março de 2021): 30–38. http://dx.doi.org/10.32434/0321-4095-2021-135-2-30-38.

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The two-stage synthesis of cyclic carbonates based on methyl esters of fatty acids from rapeseed oil is characterized. The first stage involves the synthesis of epoxides by the reaction of unsaturated methyl esters of rapeseed fatty acids with hydrogen peroxide, orthophosphoric and acetic acids. The second step is a carbonization reaction, which was carried out by passing carbon dioxide through the reactive mixture in the presence of tetrabutylammonium bromide as a catalyst. A reactive oligourethane based on cyclocarbonates cyclic carbonates of rapeseed fatty acids and piperazine was synthesized by the non-isocyanate method via the interaction of cyclocarbonate group with the amino group of piperazine. Polymer composites based on synthesized cyclocarbonates, epoxides and amines of different chemical nature were prepared and studied. Thus, there is a possibility of regulating the physical and mechanical properties of epoxyurethane composites.
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Kricheldorf, Hans R., Bettina Weegen-Schulz e Jörg Jenssen. "Cationic polymerization of cyclocarbonates". Makromolekulare Chemie. Macromolecular Symposia 60, n.º 1 (julho de 1992): 119–31. http://dx.doi.org/10.1002/masy.19920600111.

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Kricheldorf, Hans R., Bettina Weegen-Schulz e Jörg Jenssen. "Cationic polymerization of aliphatic cyclocarbonates". Macromolecular Symposia 132, n.º 1 (julho de 1998): 421–30. http://dx.doi.org/10.1002/masy.19981320139.

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Besse, Vincent, Fatou Camara, Coline Voirin, Remi Auvergne, Sylvain Caillol e Bernard Boutevin. "Synthesis and applications of unsaturated cyclocarbonates". Polymer Chemistry 4, n.º 17 (2013): 4545. http://dx.doi.org/10.1039/c3py00343d.

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Chen, Jian, He Li, Mingmei Zhong e Qihua Yang. "Hierarchical mesoporous organic polymer with an intercalated metal complex for the efficient synthesis of cyclic carbonates from flue gas". Green Chemistry 18, n.º 24 (2016): 6493–500. http://dx.doi.org/10.1039/c6gc02367c.

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Direct conversion of flue gas and epoxides to cyclocarbonates has been shown, using a 2,2-bipyridine Zn(ii) based hierarchical meso/microporous polymer as a catalyst. Mesopores facilitate reactant diffusion, while micropores enhance CO2 enrichment.
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Busko, N. A., V. K. Grishchenko, Ya V. Kochetova, Z. V. Falchenko, P. M. Davyskyba, M. O. Takse e M. O. Volochniuk. "SYNTHESIS AND STUDY OF THE PROPERTIES OF EPOXYCYCLOCARBONATES BASED ON ACRYLATE-VINYL COPOLYMERS". Polymer journal 45, n.º 3 (9 de setembro de 2023): 241–51. http://dx.doi.org/10.15407/polymerj.45.03.242.

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A method of synthesis of acrylate-vinyl copolymers based on glycidyl methacrylate and styrene at different molar ratios and epoxy cyclocarbonates based on them was developed. Synthesis of styrene-glycidyl methacrylate (СP GMA/St) copolymers was carried out by the method of thermally initiated radical polymerization in steel reactors in the presence of 1% azo-bis-isobutyronitrile initiator at a temperature of 65 °C for 10 hours. The number of epoxy groups in the synthesized СP GMA/St, determined by the potentiometric titration method, naturally decreases with a decrease in the molar ratio of GMA/styrene. The synthesis of СP GMA/St epoxycyclocarbonates was carried out in a high-pressure autoclave by passing CO2 through the reaction mixture of a solution of KP in toluene with a catalyst (tetrabutylammonium bromide 5%) with stirring at a temperature of 110–120 °C, a pressure of (4-5) atm. The structure of СP and ECC was confirmed by IR spectroscopy. No bands of double bonds are observed in the IR spectra of СP GMA/St, there are vibration bands characteristic of oligostyrene and vibration bands of C=O, C–O–C and epoxy groups. During the formation of ECC, new vibration bands of cyclocarbonate groups with a maximum of 1802 cm-1 appear, changes are observed in the absorption region of C–O–C groups (1100–1300) cm-1, and the vibration bands of epoxy groups with a maximum of 843 cm-1 decrease. The study of relaxation transitions in acrylate-vinyl copolymers GMA/St and epoxy cyclocarbonates based on them using the DSC method showed that all samples are amorphous single-phase polymers. After changing the background, the excessive enthalpy observed during the first heating disappears, and the glass transition temperature shifts towards higher temperatures, which indicates the formation of a denser and thermodynamically balanced structure. The thermostability of the synthesized GMA/St copolymers and epoxy cyclocarbons was investigated by the method of thermogravimetry. It was established that all the obtained substances have one stage of weight loss and are heat resistant, since weight loss begins at a temperature above 240 °C. In the future, the obtained epoxycyclocarbonates will be used for the synthesis of polyurethanes by the non-isocyanate method.
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Zabalov, M. V., M. A. Levina, V. G. Krasheninnikov e R. P. Tiger. "Reactivity of New Monomers of the Polyurethanes Green Chemistry, the Reaction Mechanism, and the Medium Effect". Высокомолекулярные соединения Б 65, n.º 4 (1 de julho de 2023): 286–94. http://dx.doi.org/10.31857/s2308113923700511.

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The influence of the substituents inductive effect and the proton-donor OH group in the substituted cyclocarbonates differing in the alkyl chain length on the activation barrier of their aminolysis reaction, which underlies the process of urethane formation without the participation of isocyanates, has been studied. Account for the solvent molecules has allowed quantitative interpretation of the process regularities. Kinetics of the model aminolysis reaction of a series of monomers in DMSO has been investigated.
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Zabalov, M. V., R. P. Tiger e A. A. Berlin. "Mechanism of urethane formation from cyclocarbonates and amines: a quantum chemical study". Russian Chemical Bulletin 61, n.º 3 (março de 2012): 518–27. http://dx.doi.org/10.1007/s11172-012-0076-8.

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Yang, Xiaoqing, Peiping Zhou, Yingya Zhai, Kama Huang e Guozhu Jia. "The Synthesis of Cyclocarbonates from Epoxides Utilizing Sodium Bicarbonates instead of CO2 under Microwaves". Current Microwave Chemistry 02, n.º 999 (10 de dezembro de 2014): 1. http://dx.doi.org/10.2174/2213335602666141210214019.

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Kricheldorf, Hans R., e Bettina Weegen-Schulz. "Polymers of carbonic acid. 11. Reactions and polymerizations of aliphatic cyclocarbonates with boron halogenides". Macromolecules 26, n.º 22 (outubro de 1993): 5991–98. http://dx.doi.org/10.1021/ma00074a022.

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Mais fontes

Teses / dissertações sobre o assunto "Cyclocarbonates"

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Mongkhoun, Emma. "Synthèse d'une nouvelle famille de bioconjugués peptide-polymère". Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS245.

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L'utilisation des peptides à des fins thérapeutiques passionne les chercheurs depuis plus d'un siècle. En effet, ces biomolécules se distinguent par leur bioactivité, leur grande spécificité et leurs fonctions physiologiques essentielles. Cependant, leur faible stabilité métabolique et physique limite leur emploi direct en tant que médicaments. Les bioconjugués peptide-polymère se sont révélés être une solution prometteuse pour surmonter ces limitations. Dans cette thèse, nous explorons une nouvelle méthode de synthèse de bioconjugués en utilisant la polymérisation anionique par ouverture de cycle. Cette approche, simple à mettre en oeuvre, permet de produire rapidement des bioconjugués sans avoir besoin de pré-fonctionnaliser les peptides. Les γ-thiolactones jouent un rôle central dans ce travail, étant utilisées à la fois comme co-amorceurs pour la polymérisation anionique par ouverture de cycle d'épisulfures et comme co-monomères dans la synthèse de poly(thioéther-alt-ester). Les matériaux obtenus présentent des propriétés physicochimiques intéressantes, notamment une sensibilité à l'oxydation et une faible cytotoxicité, ce qui ouvre la voie à des applications potentielles dans le domaine biomédical
The use of peptides for therapeutic purposes has fascinated researchers for over a century. Indeed, these biomolecules are characterized by their bioactivity, high specificity and essential physiological functions. However, their low metabolic and physical stability limits their direct use as drugs. Peptide-polymer bioconjugates constitute is presented as an alternative to overcome these limitations. In this thesis, we explore a new method for bioconjugate synthesis using anionic ring-opening polymerization. This simple to implement approach enables rapid production of bioconjugates without the need to pre-functionalize peptides. γ-thiolactones play a central role in this work, being used both as co-initiators for anionic ring-opening polymerization of episulfides and as co-monomers in the synthesis of poly(thioether-alt-ester). The materials obtained display interesting physicochemical properties, including oxidation sensitivity and low cytotoxicity, paving the way for potential applications in the biomedical field
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Blain, Marine. "Substitution des isocyanates dans les polyuréthanes pour des revêtements transparents de forte épaisseur". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1058.

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L'entreprise Juxta produit des résines pour des revêtements transparents de fortes épaisseurs en polyuréthane. Ces revêtements sont fabriqués à partir de deux produits dangereux : les isocyanates et un catalyseur à base de mercure. Pour protéger ses employés et consommateurs, l'entreprise Juxta a lancé un projet de substitution des isocyanates dans les polyuréthanes. Pour ce faire, trois nouvelles voies de synthèse ont été envisagées :La voie cyclocarbonate/amine est la plus novatrice. Dans un premier temps, la réactivité de cyclocarbonates et d'amines modèles a été étudiée ainsi que l'effet de différents catalyseurs. Les meilleurs catalyseurs sont de la famille des thiourées, urées et guanidines. Puis une voie d'accès à des cyclocarbonates incolores a été mise au point. Enfin, une étude a permis de mettre en évidence que les liaisons hydrogènes étaient responsables du faible avancement de la réaction lors de la synthèse de polyhydroxyuréthanes linéaires.La voie époxy/amine a permis de développer une gamme de matériaux transparents avec des Tg allant de 18 à 47°C. Une étude IR a été réalisée, permettant de mieux appréhender le phénomène de carbonatation de l'amine, récurent lors de la synthèse de résines époxys à température ambiante. L'utilisation de prépolymères aminotéléchéliques permet de contourner ce phénomène.La voie acrylate/amine a permis de développer un matériau transparent de basse Tg, -12°C. L'étude de la réactivité des acrylates avec les amines a été réalisée par DSC et RMN. Des tests de formulation ont été effectués dans le but d'augmenter la Tg
Juxta company produces thick transparent polyurethane coatings. These coatings are made from hazardous compounds, isocyanates and a mercury based catalyst. In order to protect its employees and consumers Juxta company wants to get rid of the isocyanates in its formulations. Therefore, three new synthesis pathways have been considered.The carbonate/amine pathway is the more innovative one. First, the reactivity and catalysis of model cyclocarbonates and amines were studied. The thioureas, ureas and guanidines proved to be very efficient catalyst families for the cyclocarbonate aminolysis. Then a synthesis was developed to obtain transparent cyclocarbonates. To conclude, a study conducted on linear polyurethanes demonstrated that hydrogen bondings are responsible for the low conversions observed with this reaction.Transparent materials with Tg ranging from 18°C to 47°C were synthesized using the epoxy/amine pathway. An IR study was performed to better understand the amine carbonation phenomenon. It is a frequent phenomenon when the epoxy resins are synthesized at room temperature. Aminotelechelic prepolymers can be used to circumvent it.A low Tg (-12°C) transparent material was synthesized using acrylate/amine synthesis. The couple reactivity was studied by DSC and NMR. Then several formulations were performed in order to increase the Tg
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Capar, Özgür [Verfasser], Laura [Gutachter] Hartmann e Helmut [Gutachter] Ritter. "Von Epoxid-Bausteinen zu funktionalen Polymeren: Synthese von Cyclocarbonat-Monomeren und Polyhydroxyurethanen sowie Polymer-Proteinkonjugaten / Özgür Capar ; Gutachter: Laura Hartmann, Helmut Ritter". Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2021. http://d-nb.info/1239413599/34.

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Carre, Camille. "Synthèse et caractérisation de nouveaux matériaux polyuréthanes respectueux de l'environnement et de la santé". Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAE043.

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De nouveaux polyuréthanes ont été synthétisés sans isocyanate et en intégrant des synthons biosourcés afin de développer des matériaux innovants et performants pour des applications dans le domaine de l’industrie automobile et du bâtiment. À l’issue d’un état de l’art, divers synthons et différentes stratégies ont été retenus afin d’obtenir de nouvelles architectures (macro)moléculaires et conférer aux matériaux finaux les propriétés physico-chimiques recherchées. Dans un premier temps, la réaction entre un biscyclocarbonate issu d’une molécule modèle, l’acide sébacique, et des diamines dimériques ainsi que plusieurs paramètres réactionnels ont été étudiés. Cette première étude a permis de montrer l’intérêt du ratio entre les monomères ainsi que l’influence de la fonctionnalité des diamines sur les propriétés chimiques, thermiques, rhéologiques et mécaniques des matériaux polyuréthanes sans isocyanate. Cette approche a permis dans un second temps de synthétiser des matériaux pouvant être entièrement biosourcés et de comparer leurs propriétés à celles des polyuréthanes conventionnels. Les performances de certains des matériaux thermodurcissables obtenus ont confirmé l’intérêt de cette stratégie pour les applications visées. Enfin, une troisième approche a été consacrée à la synthèse de polyuréthanes sans isocyanate thermoplastiques via la synthèse de prépolymères. Les différentes études ont montré l’importance de la structure des divers synthons sur l’organisation macromoléculaire, et ainsi sur les propriétés des matériaux finaux
Novative and performant polyurethane materials without isocyanate were synthesized using biobased molecules for applications in automotive and building industries. After a state of the art, different building blocks were selected and various strategies were established to develop new (macro)molecular architectures. First, reactions between a biscyclocarbonate from a model structure and dimer diamines were studied as well as the impact of various reaction parameters. Secondly, this approach was adapted to fully biobased materials. The properties of these nonisocyanate polyurethanes were compared with those of conventional ones. The influence of the monomer structures on the final materials was also demonstrated. The performance of some thermoset materials have confirmed the importance of the chosen strategies for the desired applications. Finally, a third approach was dedicated to the synthesis of thermoplastic nonisocyanate polyurethanes via a prepolymer synthesis. The various studies have revealed the specific impact of the building block structure on the macromolecular organization, and thus on the properties of the final materials
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Ku, Kuan-Tseng, e 顧冠增. "Non-Isocyanate Synthesis of Polyurethane from Cyclocarbonate Intermediates and Aliphatic Amines". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/u2494f.

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碩士
國立中興大學
化學工程學系所
100
In this study, my initial approach to NIPU started with the screening of active amines toward cyclocarbonates through model study to identify the best combination in terms of their reaction rates and selectivity in forming carbamates. The study establishes that only aliphatic primary amines are reactive enough to effect ring-opening reactions of cyclocarbonates. We also found that linear aliphatic primary amine is the most preferred over cyclic aliphatic amines because of faster ring-opening rate and better selectivity toward cyclocarbonates in formation of carbamate. The above guiding chemistry was applied to our NIPU formulation development. In one of our approach, starting bis-cyclocarbonates were prepared first from bisphenol A-diglycidylether (BPA-DGE) by insertion of carbon dioxide. The subsequent amine-terminated prepolymers were then synthesized by the reaction of the prepared bis-cyclocarbonates with p-xylylenediamine at 100℃. Finally, variety of blocked isocyanates of different functionalities and weight proportions were used to finish up the processes in formation of both linear or crosslinked NIPU products. These products were characterized individually by FTIR, TGA, DSC, GPC and ATR. It was found that the optimal NIPU achieved so far has been the one chain-extended with MBI-7950-75 that exhibited high dimension stability and median hardness (3H) with Tg of 60.3℃. Another bis-cyclocarbonates were synthesized from hexamethylene diisocyanate with glycerin carbonate (GC) in high yield (95%). This bis-cyclocarbonate was also ring-opened by reaction with hexamethylenediamine and tris(2-aminoethyl)amine. However, the resulting mechanical properties of NIPU products are not as good as those of BPA-GCE derived series, and the reason may be because of more urea formation through trans-esterification during the ring-opening step. Through this research, we have realized that the major and common shortcomings of NIPU processes are due to low molecular-weights of the products because of the complication in chain extending step. This difficulty will be a challenge for the future effort.
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Livros sobre o assunto "Cyclocarbonates"

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Hamburg, Universität, ed. Untersuchungen über die Polymerisation aliphatischer Cyclocarbonate mit Zinnkatalysatoren. [s.l.], 1996.

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Capítulos de livros sobre o assunto "Cyclocarbonates"

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Figovsky, Oleg L., e Leonid Shapovalov. "Cyclocarbonate-Based Polymers, Non-Isocyanate Polyurethane Adhesives and Coatings". In Encyclopedia of Surface and Colloid Science, Third Edition, 1613–30. CRC Press, 2016. http://dx.doi.org/10.1081/e-escs3-120041611.

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Trabalhos de conferências sobre o assunto "Cyclocarbonates"

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"Chemical resistance of biopolymers based on the epoxy resin modified with epoxidised and cyclocarbonated soybean oils". In Chemical technology and engineering. Lviv Polytechnic National University, 2021. http://dx.doi.org/10.23939/cte2021.01.188.

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