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Article
Revisiting the Problem of Adsorption/Desorption Isotherms on Hypercrosslinked Polymers
This contribution is focused on the examination of adsorption/desorptiom isotherms for nitrogen at 77 K and benzene vapors at 293 K on various hypercrosslinked polystyrene (HP) resins. All isotherms for N2 are id...
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Article
Anion Exchangers Based on 4-Vinylpyridine and Alkyl Dihalides: Synthesis and Application in the Sorption of Noble Metal Ions and the Addition of СО2 to Epoxides
Strongly basic anion exchangers are synthesized by the spontaneous polymerization of 4-vinylpyridine under its interaction with alkyl dibromides. It is demonstrated that they can be successfully applied in the...
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Article
Attempts to Optimizing the Synthesis of Hypercrosslinked Polystyrene. 1. Crosslinking with Monochlorodimethyl Ether
This contribution was focused on the develo** of an improved method for preparing hypercrosslinked polystyrene by bridging styrene-0.5% DVB copolymer with monochlorodimethyl ether (MCDE) up to 100, 150, 200 ...
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Article
Attempts to Optimizing the Synthesis of Hypercrosslinked Polystyrene. Reactions with in situ Formed Monochlorodimethyl Ether
The study is focused on the development of a “one-pot” procedure for preparing hypercrosslinked polystyrene sorbents. The method is based on in situ formation of monochlorodimethyl ether (MCDE) via the reactio...
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Article
Synthesis of Strong Anion Exchangers by the Interaction of 4-Vinylpyridine with Epoxy-Containing Alkylating Reagents and Their Use in the Sorption of Noble Metals
Methods of obtaining strong anion exchangers provided with oxygen-containing functional groups (–OH, C–O–C), along with pyridinium cations, were described. Spontaneous polymerization of monomeric 4-vinylpyridi...
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Article
Open AccessThe Riddle of Atmospheric Oxygen: Photosynthesis or Photolysis?
The stoichiometry of the photosynthetic reaction requires that the quantities of the end products (organic biomaterial and free oxygen) be equal. However, the correct balance of the amounts of oxygen and organ...
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Article
On the Mechanism of Swelling of Gel-Type, Macroporous and Hypercrosslinked Copolymers of Styrene
Gel type polymers, polymers of expanded structure and macroporous polymers of styrene mostly with 6 mole% of divinylbenzene have been obtained by suspension polymerization, expanded and macroporous structures ...
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Article
Open AccessPalladium Nanoparticles in Hypercrosslinked Polystyrene: Synthesis and Application in the Hydrogenation of Arenes
A novel method for incorporation of palladium nanoparticles into a porous hypercrosslinked polystyrene matrix has been developed. The composite obtained by reduction of [Pd(π-allyl)Cl]2 with hydrogen in...
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Article
Synthesis of organic cyclic carbonates assisted by macroporous polystyrene-based catalyst
An easy-to-prepare recyclable catalyst of quaternary ammonium nature and based on commercially available and inexpensive macroporous polymeric sorbent Purolite A103 resin has been devised for the carbon dioxid...
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Article
Synthesis of Polymer–Metal Composites by the Impregnation of Hypercrosslinked Polystyrene with Palladium Compounds in Supercritical Carbon Dioxide and Their Catalytic Activity in the Liquid-Phase Hydrogenation of Diphenylacetylene
Composites—palladium metal particles in a polymer matrix—are obtained by impregnation of hypercrosslinked polystyrene with palladium compounds in supercritical carbon dioxide (SC-CO2) followed by molecular hydrog...
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Article
Hydroxy-containing ionic liquids as catalysts in the synthesis of organic carbonates from epoxides and CO2
Hydroxy-containing ionic liquids such as triethyl(3-hydroxypropyl)ammonium, 1-(3-hydroxypropyl)-3-methylimidazolium, 3-(2-hydroxyethyl)-1-methylimidazolium, and 1-(3-hydroxypropyl)pyridinium chlorides were use...
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Article
The use of a diammonium salt in the synthesis of organic carbonates from epoxides and CO2: promoting effect of support
Onium salt, N1, N1, N1, N5, N5, N5-hexaethylpentane-1,5-diammonium dibromide, was used as a catalyst for the addition of CO2 to epoxides. An influence of insoluble supports on the rate of the process as well as p...
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Article
Iron-containing composite based on hypercrosslinked polymer sorbents in the sorption of toxic and bad-smelling substances
A simple technique for introducing iron hydroxide into a highly porous polystyrene matrix is proposed. The resulting composite sorbent showed a high ability to purify air by removing hydrogen sulfide, bad-smel...
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Article
Silica gel modified with tetraalkylammonium halides as an available and efficient catalyst for the synthesis of cyclic organic carbonates from epoxides and CO2
Silica gel with the additives of tetraalkylammonium halides serves as an efficient catalyst for the solvent-free insertion of carbon dioxide into epoxides (10–56 atm of CO2, 105–100 °C), leading to cyclic carbona...
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Article
The use of hypercrosslinked polymer sorbents and composites based on them in the sorption of toxic and bad-smelling substances
The sorption of cadaverine from the air on hypercrosslinked polystyrene sorbents was investigated. An available technique for the introduction of iron oxide into the polystyrene matrix was proposed. The sorben...
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Article
Heavy-Metal Ion Extracting Agents Based on Crosslinked Polyethylenimine
New porous polymer materials based on crosslinked highly branched polyethylenimine (PEI) are synthesized. Epichlorohydrin, diethylene glycol diglycidyl ether, and chloroacetic acid diesters with ethylene glyco...
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Article
Asymmetric Ir-catalyzed hydrogenation of 4-R-1,3-dihydro-2H-1,5-benzodiazepin-2-ones using a novel phosphoramidite ligand
A novel chiral phosphoramidite ligand, (Sa)-2-[N-ethyl-N-(1-naphthylmethyl)amino]-dinaphtho[2,1-d:1´,2´-f][1,3,2]dioxaphosphepane, was obtained and tested in Ir-catalyzed asymmetric hydrogenation of a series of 4...
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Article
Optical Properties and Model of the Electronic and Spatial Structure of Hypercrosslinked Polystyrene
A number of hypercrosslinked polystyrene networks are studied. The networks are obtained via additional crosslinking of granules of styrene copolymer with 0.5% divinylbenzene (0.3–0.5 mm) and microgranules wit...
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Article
On the Features of Sorption Concentration of Ru on Super-Crosslinked Polystyrenes during the Analysis of Rocks by the Method of Inductively Coupled Plasma Mass Spectrometry
New sorption systems based on a series of super-crosslinked polystyrenes of brands HP and Styrosorb for the concentration of Ru from the solutions obtained after decomposition of rocks are studied. To extract ...
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Article
Synthesis and Physicochemical Properties of Hypercrosslinked Polysterene Restricted-Access Materials
With a view to simplifying and reducing the cost of the synthesis of novel selective restricted-access materials based on microporous hypercrosslinked polystyrene for solid-phase extraction, various polystyren...
