Papers by Leonid Shapovalov
Advanced Polymer Concretes and Compounds, 2013
Cyclic carbonates (CC) are a comparatively new class of raw materials for preparation of high per... more Cyclic carbonates (CC) are a comparatively new class of raw materials for preparation of high performance “green” heterochain polymers. CC can be prepared using different synthetic methods. In particular, the cycloaddition of CO2 into epoxides to afford five-membered cyclic carbonate with versatile reactivity and the subsequent reaction between the cyclic carbonate and aliphatic primary amine forming urethane linkage have been the active subjects of investigations since they allow non-isocyanate polyurethanes (NIPUs) to be prepared. Polycarbonates may be prepared also by polymerization of mono cyclic carbonates containing C=C double bonds.
Surface Coatings International Part B: Coatings Transactions, 2004
SummariesA new generation of protective coatings based on non-isocyanate polyurethanes (NIPU) and... more SummariesA new generation of protective coatings based on non-isocyanate polyurethanes (NIPU) and waterborne compositions of fire-resistant coatings are being developed.This paper discusses advanced chemical and UV-resistant coatings for industrial application, based on the reaction of cyclocarbonates, primary amines and epoxy resins to produce NIPU and HNIPU (hybrid non-isocyante polyurethanes).The results of investigations of advanced fire-resistant and flame-retardant coatings based on sodium silicate, aluminum hydroxide, sodium oxalate and pigments are reported.RésuméUne nouvelle génération de revêtements protecteurs, basés sur le polyuréthane non isocyanate et sur des compositions hydrodiluables de revêtements qui résistent au feu est en train d’être développée. Dans la premier partie de cet article on discute des revêtements avancés chimiques et résistant à UV qui ont une application industrielle. [Les constations] sont basés sur la réaction de cyclocarbonates, d’amines primaires, et de résines époxy.La deuxième partie présente les résultats d’un examen des revêtements avancés qui sont résistant au feu et retardateurs de flammes. Ces revêtements sont basés sur le silicate de sodium, l’hydroxyde d’aluminium, l’oxalate de sodium, et des pigments.ZusammenfassungEine neue Generation von Schutzlacken auf non-Isocyanat-Polyurethanbasis und wasserlösliche Kompositionen von feuerresistenten Anstrichen werden derzeit entwickelt.Der erste Teil dieser Arbeit beschäftigt sich mit neuartigen Chemikalien-und UV-resistenten Lacken für industrielle Anwendungen, die auf der Reaktion von Zyklocarbonaten, Primäraminen und Epoxidharzen beruhen.Der zweite Teil konzentriert auf das Ergebnis von Studien von feuerresistenten und flammretardierenden Anstrichen auf Basis von Natriumsilikat, Aluminiumhydroxid, Natriumoxalat und Pigmenten.
Задача данной статьи – систематизировать опубликованные результаты в области неизоцианатных полиу... more Задача данной статьи – систематизировать опубликованные результаты в области неизоцианатных полиуретанов (НИПУ). Основное внимание было уделено замене ими традиционных полиуретанов, отверждаемых при обычных температурах и практически не содержащих летучих органических веществ (ЛОВ). Такие материалы используют в основном при производстве красок, половых покрытий и пен. Рассмотрены возобновляемые источники сырья и другие новые пути синтеза НИПУ. Приведены также сведения о гибридных композициях (ГНИПУ).
Scientific Israel – Technological Advantages, 2008
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L'invention concerne un procede et un appareil ameliores de synthese de cyclocarbonates oligo... more L'invention concerne un procede et un appareil ameliores de synthese de cyclocarbonates oligomeriques a partir de composes epoxy et de dioxyde de carbone en presence d'un catalyseur. L'invention concerne egalement des composes epoxy en etoile et la preparation ainsi que l'utilisation de ceux-ci dans la production de cyclocarbonates en etoile, d'oligomeres urethane hydroxy en etoile, et de NIPU et de HNIPU en etoile. L'invention concerne en outre des composes epoxy acryliques, des cyclocarbonates acryliques, des oligomeres urethane hydroxy acryliques, et des NIPU et des HNIPU acryliques ainsi que leurs procedes de preparation.
Recent advances in chemistry and technology of non-isocyanate polyurethane (NIPU) materials based... more Recent advances in chemistry and technology of non-isocyanate polyurethane (NIPU) materials based on cyclic carbonate oligomers are reviewed in this paper. Reaction of the cyclic carbonate and amino groups results in β-hydroxyurethane fragments with specifi c properties. Primary attention is given to the hybrid materials that contain epoxy and acrylic compounds, especially materials based on renewable raw materials. Hybrid organicinorganic composites comprising of silanes are also considered. An overview of the recent publications in this fi eld is provided with a more detailed description of the Polymate Ltd. achievements. The use of NIPU materials as coatings, adhesives, and foams is described.
Macromolecular Symposia, 2002
We have studied different ways of preparing UV resistant oligomers with terminated cyclocarbonate... more We have studied different ways of preparing UV resistant oligomers with terminated cyclocarbonates, epoxy and amino groups. We have studied possibility of preparing HNIPU UV stable coatings. Linear and branched amino containing oligomers based on di- and tricyclocarbonates and primary diamines were investigated. It was found that oligomers should be used for curing epoxy-saturated resins, but since the residual quantity of amines this system can't be used for UV resistant coatings. The same problem was in system on the base of nonisocyanate epoxy-urethane oligomers cured by tertiary amines. Coating on the base of acrylic cyclocarbonates and oligomers with primary amines are similar to conventional polyurethane coatings on the base of acrylic hydroxyl containing oligomers and isocyanates, but mechanical properties and chemical resistance are better.
The paper is devoted to advanced chemical and UV-resistant coatings for industrial application ba... more The paper is devoted to advanced chemical and UV-resistant coatings for industrial application based on reaction of cyclocarbonates primary amines and epoxy resins. We present results of investigations of advanced fire resistant and flame-retardant coatings on the base of sodium silicate, aluminum hydroxide, sodium oxalate, and pigments and results of investigations of biodegradable ecopolymer compositions applied as coating for various hydrophilic substrates. One of the main methods of decreasing environmental hazards is applying environmentally friendly materials [1]. We would like to describe a few of them. 1 Nonisocyanate polyurethane coatings Network nonisocyanate polyurethanes are formed as a result of the reaction between cyclocarbonate olygomers and primary amine oligomers [2]. This reaction forms an intra-molecular hydrogen bond through the hydroxy group at the ß-carbon atom of the polyurethane chain as illustrated below:
The latest published achievements in the research and developments of non-isocyanate polyurethane... more The latest published achievements in the research and developments of non-isocyanate polyurethanes on the base of five-membered cyclic carbonates and amines are briefly presented. Preparations of hybrid epoxy-amine hydroxyurethane-grafted polymers with a controlled number of cross-links are described. Examples of the use of hydroxyurethanes of different nature for modification of the oligomeric compositions are also given.
Nonisocyanate polyurethane and hybrid Epoxy-Polyurethane materials are the next generations of po... more Nonisocyanate polyurethane and hybrid Epoxy-Polyurethane materials are the next generations of polyurethanes with high chemical resistance properties and increased mechanical resistance properties when compared to conventional epoxy materials. Hybrid nonisocyanate chemical resistant epoxyurethane network polymers are formed from the reaction between olygomeric aminourethane adducts and aromatic amines (adducts) with epoxy resins. HNIPU display the same chemical resistant properties as conventional epoxy resins yet their mechanical properties are better. As result, hybrid nonisocyanate epoxyurethanes can be effectively utilized in many industrial applications.
Cyclic carbonates (CC) are a comparatively new class of raw materials for preparation of high per... more Cyclic carbonates (CC) are a comparatively new class of raw materials for preparation of high performance “green” heterochain polymers. CC can be prepared using different synthetic methods. In particular, the cycloaddition of CO2 into epoxides to afford five-membered cyclic carbonate with versatile reactivity and the subsequent reaction between the cyclic carbonate and aliphatic primary amine forming urethane linkage have been the active subjects of investigations since they allow non-isocyanate polyurethanes (NIPUs) to be prepared. Polycarbonates may be prepared also by polymerization of mono cyclic carbonates containing C=C double bonds.
Surface Coatings International Part B-coatings Transactions, 2005
Summary Conventional monolithic polyurethanes have good mechanical properties, but they are poro... more Summary Conventional monolithic polyurethanes have good mechanical properties, but they are porous, and posseses poor hydrolytic stability and insufficient permeability. The involvement of toxic components, such as isocyanates, in their production process makes this process extremely toxic and dangerous. Network non-isocyanate polyurethanes (NIPUs) are formed from the reaction between cyclocarbonate oligomers (CCOs) and primary amine oligomers (PAOs). The authors of this
Chemistry & Chemical Technology
The article reviews production and application of the nonisocyanate polyurethanes based on cyclic... more The article reviews production and application of the nonisocyanate polyurethanes based on cyclic carbonate oligomers. Nonisocyanate polyurethane (NIPU) networks are obtained by the reaction between the polycyclic carbonate oligomers and aliphatic or cycloaliphatic polyamines with primary amino groups. The result is a crosslinked polymer with β-hydroxyurethane groups of different structure defined as a polyhydroxyurethane polymer. The article discusses NIPU and hybrid NIPU (HNIPU), which also contains epoxy and acrylic compounds. Significant attention was paid to the formation of the materials based on renewable raw materials. The authors provide an overview of the recent publications in this field with a more detailed description of the Polymate Ltd. achievements.
Chemistry & Chemical Technology, 2016
The latest published achievements in the research and developments of non-isocyanate polyurethane... more The latest published achievements in the research and developments of non-isocyanate polyurethanes on the base of five-membered cyclic carbonates and amines are briefly presented. Preparations of hybrid epoxy-amine hydroxyurethane-grafted polymers with a controlled number of cross-links are described. Examples of the use of hydroxyurethanes of different nature for modification of the oligomeric compositions are also given.
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Papers by Leonid Shapovalov