M. I. Abdullin

Hydrochlorinated Derivatives of Syndiotactic 1,2-Polybutadiene

Chlorine-containing polymeric products with a degree of functionalization of up to 70% are synthesized through the hydrochlorination of syndiotactic 1,2-polybutadiene via carbon-carbon double bonds. The introduction of chlorine atoms into polydiene units causes substantial changes in the viscosity of polymer solutions, the flowability of the polymer melt, the glass-transition and flow temperatures, and the thermal stability of polymers. The hydrochlorinated derivatives of syndiotactic 1,2-polybutadiene demonstrate good adhesion with respect to steel and can be used in adhesive compositions.

Dichlorocyclopropane derivatives of syndiotactic 1,2-polybutadiene

Polymeric products containing hem-dichlorocyclopropane units with a degree of functionalization of up to 97% are synthesized via the reaction of syndiotactic 1,2-polybutadiene with dichlorocarbene obtained by the interaction of chloroform with an aqueous solution of sodium hydroxide in the presence of a phase-transfer catalyst. The incorporation of dichlorocyclopropane groups into units of polydiene substantially changes its molecular mass and polydispersity, the solution viscosity, the polymer melt flowability, and the glass-transition temperature and flow temperature of the polymer.

Chlorinated Polymers Based on Low-Molecular-Mass 1,2-Polybutadiene

It has been shown that chlorinated polymer products based on low-molecular-mass 1,2-polybuta-diene can be produced by incorporation of chlorine and hydrogen chloride via carbon-carbon double bonds of polymer macromolecules. The functionalization of polydiene by halogen atoms results in such significant changes in the physicochemical properties of the polymer as solution viscosity and flowability of the polymer product. 1,2-Polybutadiene modified by chlorination and hydrochlorination shows good adhesion to steel and can be used as a component of adhesive compositions, which are used in the production of PVC adhesive films for insulation of main pipelines.

Properties of dichlorocyclopropane derivatives of syndiotactic 1,2-polybutadiene

Properties of new halogenated polymeric products containing dichlorocyclopropane groups in the macromolecules and obtained by modification of syndiotactic 1,2-polybutadiene were studied. The influence of the degree of the polymer functionalization on the rheological and physicochemical properties and on the heat resistance of the dichlorocyclopropane derivatives of syndiotactic 1,2-polybutadiene was revealed. Dichlorocyclopropanated 1,2-polybutadiene can be used as a component of plasticized polyvinyl chloride formulations, improving the processability of the polymeric compound.

Synthons for biologically active compounds on the basis of naphthalene ozonolysis products

Ozonolysis of naphthalene in aqueous methanol, followed by the reduction of peroxy compounds thus formed with potassium iodide in the presence of acetic acid, gave 3-methoxy-2-benzofuran-1(3H)-one. In the absence of water, the product was methyl o-formylbenzoate. The latter was used as a synthon for the preparation of aromatic analogs of (2E)-2,6-dimethyloct-2-ene-1,8-diol ethers which are effective juvenoids.

Derivatives of syndiotactic cyclopropane-containing 1,2-polybutadiene

The results of syndiotactic 1,2-polybutadiene cyclopropanation with diazomethane are demonstrated in an organic solvent in the presence of an organometallic catalyst to produce new polymers containing an unsubstituted cyclopropane group in the macrochain. A comparative evaluation of the levels of activity and regioselectivity of catalysts in 1,2-polybutadiene cyclopropanation is performed. This modification of syndiotactic 1,2-polybutadiene is shown to make it possible to obtain thermoplastic products with a relatively high energy saturation.

Thermal Degradation of Halogen Derivatives of Syndiotactic 1,2-Polybutadiene

Thermal degradation of halogen derivatives of syndiotactic 1,2-polybutadiene, differing in the kind of the halogen, its content in the polymeric product, and its position in the monomeric unit, was studied by thermal gravimetric analysis. Comparative evaluation of the heat resistance of the halogenated polymers under consideration was made.

Reaction of apple pectin modified by pharmacophores, with copper(II) cations

The reaction of apple pectin modified by organic pharmacophores (nicotinic, salicylic, 5-aminosalicylic, and anthranilic acids) with Cu(II) cations was studied by spectral methods. The compositions of the complexes were determined and their stability constants, as well as the thermodynamic parameters (ΔH0, ΔG0, ΔS0) of the complex formation were calculated. The structure of the drug in the polymeric ligand was found to affect certain physicochemical properties of the metal complexes.

Properties of modified polymers based on syndiotactic 1,2-polybutadiene

The influence of the chemical modification on the properties of syndiotactic 1,2-polybutadiene derivatives that contain various functional groups in macromolecules and show promise for practical use was studied. The dependence of the glass transition point and the fluidity and rheological properties of modified polydiene melts on the nature of the functional group in the macrochain and on the degree of the polymer functionalization was revealed. The possibility of directional synthesis of modified polymer products with the required operation characteristics on the basis of syndiotactic 1,2-polybutadiene was demonstrated.

Epoxidation of syndiotactic 1,2-polybutadiene with peracids

The epoxidation of syndiotactic 1,2-polybutadiene (84 and 16% 1,2 and 1,4 units, respectively) with carboxylic peracids prepared in situ and m-chloroperbenzoic acid was studied. In the course of epoxidation in the presence of carboxylic peracids, oxirane groups are formed only through epoxidation of double bonds in the macromolecular backbone, whereas m-chloroperbenzoic acid is responsible for the chemical modification of 1,2 and 1,4 units of polybutadiene. The basic kinetic parameters of 1,2-polybutadiene epoxidation with peracids of various chemical structures were determined.