L. Ya. Tsarik

Copolymerization of divinyl monomers with maleic and fumaric acid derivatives

The process of formation of reticular copolymer molecular structures produced in free radical copolymerization of divinyl monomers (divinyl ethers of diethylene glycol and hydroquinone, divinyl sulfide, p-divinylbenzene, etc.) with maleic and fumaric acid derivatives is studied. The basic factor that determines the features of molecular and network structures of copolymers is reactivity of the divinyl monomer in copolymerization with monovinyl monomer. The network of copolymers of maleic anhydride with the divinyl ether of hydroquinone is formed out of oligomer microgels. Divinyl sulfide in copolymerization with maleic acid is disposed to cyclocopolymerization; also crosslinking reactions occur. Formation of network structure of copolymers of divinylbenzene with maleic and fumaric acid derivatives is shown to proceed via an alternating copolymerization mechanism.

Methods of investigation suspension copolymerization of butadiene ester of hydroquinone and acrylonitrile

Abstract A method was developed for suspension copolymerization of butadiene ester of hydroquinone and acrylonitrile in the presence of a stabilizer — a copolymer of methyl methacrylate and sodium salt of methacrylic acid for the concentration of a crosslinking agent of 10, 20 mole %. It was found possible to form macro-porous copolymers by suspension copolymerization of butadiene ester of hydroquinone and acrylonitrile in the presence of isoamyl alcohol and nonane. Copolymers, which are characterized by high latent porosity, were obtained in the presence of dimethyl formamide, dichlorethane and chloroform.

Suspension Copolymerization of Styrene and Divinylbenzene in the Presence of Stabilizers (Starch and Gelatin)

The procedure for preparing spherical particles of copolymers of styrene and technical-grade divinylbenzene in the presence of stabilizers (starch and gelatin) added to improve the process parameters was examined with the aim to develop a process for production of gel ion-exchange resins.

Suspension copolymerization of divinylbenzene in a gel medium

A procedure of suspension polymerization and copolymerization in a medium of thermally reversible gels was developed.

Wastes from woodworking industry as a filler for a cable sheathing compound

The suitability of an alternative filler for a cable polyvinyl chloride plastic compound was studied. Physicomechanical, chemical, and relaxation properties and inflammability of plastic compound were analyzed in relation to the filler content.

Effect of a linear polymer on crosslinking heterophase copolymerization of maleic anhydride, styrene, and divinylbenzene

A polymeric porogene has been shown to promote the formation of a developed porous structure in network maleic anhydride-styrene-divinylbenzene copolymers synthesized through crosslinking free-radical alternating copolymerization in the presence of a solvating solvent (dioxane).

Copolymerization of divinyl and monovinyl monomers

The data on the free-radical and cationic copolymerization of divinyl and monovinyl monomers are surveyed. The monomer systems under consideration show promise for the production of crosslinked copolymers free of divinyl monomer blocks. Specific features of the gelation and kinetics of the three-dimensional copolymerization of divinyl monomers are considered. This information is necessary for characterization of crosslinked copolymers useful as matrices for the manufacture of sorbents.

Copolymerization of p-divinylbenzene with maleic anhydride☆

Abstract The three-dimensional radical copolymerization of p -divinylbenzene and maleic anhydride has been investigated. It was established that the network structure of the copolymers forms during alternating copolymerization.

Radical three-dimensional copolymerization of the divinyl ether of hydroquinone and maleic anhydride☆

Abstract The authors have studied the radical three-dimensional copolymerization of maleic anhydride with the divinyl ether of hydroquinone which display low activity on homopolymerization and forming between themselves donor-acceptor complexes with weak charge transfer. A soluble oligomer with the ratio of monomer units 1 : 1 has been isolated and characterized. From the values of the constants of relative activity of the monomers, the results of sol-gel analysis of the copolymers obtained, their composition and properties and also analysis of the Bridge-Stewart models the authors postulate the structure of the regularly crosslinked copolymers of the divinyl ether of hydroquinone and maleic anhydride. The kinetics of copolymerization in the course of the entire process has been studied by the method of thermometry and the points of gel formation for different contents of the divinyl monomer determined. A mechanism of chain growth to the point of gel formation is proposed.

Heat of wetting and porous structure of network copolymers

Abstract The heats of wetting by different solvents of porous copolymers of a monovinyl with a divinyl monomer have been measured. It is shown that the heats of wetting may serve as a characteristic of the quality of the solvent as a pore former on synthesis of porous network polymers.