Initiating and Cross-Linking Properties of Urea-Formaldehyde Oligomers with Peroxide Groups

The initiating properties of urea-formaldehyde oligomers with peroxide groups have been studied. For comparison, the initiating activity has been examined for the polymerization of styrene by the peroxide oligomer based on the epoxy oligomer Epidian-5 and tert-butyl hydroperoxide. The cross-linking properties of the urea-formaldehyde oligomers with peroxide groups have been investigated using unsaturated oligoesters as a model. The chemistry of the formation of the substances with a cross-linked structure has been studied using IR spectroscopy.

Obtaining of Coumarone-Indene Resins Based on Light Fraction of Coal Tar. 2. Coumarone-Indene Resins with Epoxy Group

Coumarone-indene resins with epoxy groups (CIRE) have been obtained using light fraction of coal tar or fraction with the distillation range of 423–463 K based on it. Styrene and glycidyl methacrylate were used as modifiers. CIRE were synthesized via radical cooligomerization using monoperoxide derivative of dioxyphenylpropane diglycidyl ether (PO) as an initiator. Thermal stability of PO has been studied. The effect of initiator amount, reaction temperature and time on the yield and softening temperature of CIRE has been determined.

Obtaining of coumarone-indene resins based on light fraction of coal tar 1. coumarone-indene resins with carboxy groups

Coumarone-indene resins (CIR) with carboxy groups were synthesized via cooligomerization of unsaturated compounds presented in light fraction of coal tar and its fraction boiling out within 423–463 K with the addition of such industrial monomers as styrene, maleic anhydride, glycidyl methacrylate and methacrylic acid. 2,2`-Azobis(2-methylpropionitrile) in the form of 0.2 M solution in toluene was used as an initiator. The effect of monomers nature, initiator amount, temperature and reaction time on the yield and characteristics of resulted CIR has been determined.

Catalytic Cooligomerization of Styrene and Dicyclopentadiene: Yield and Properties Dependence on Reaction Mixture Composition

Cationic cooligomerization of styrene and dicyclopentadiene, being main polymerizable components of C9 fraction of liquid pyrolysis products of hydrocarbon feed, has been studied. Dependence of the cooligomer yield and properties including average molecular weight, softening point, bromine number, colour, and density on styrene/dicyclopentadiene ratio in the reaction mixture have been determined. Cooligomerization was carried out in solution using AlCl3 based liquid catalytic complex and silica-alumina acid type catalyst that made it possible to compare the catalysts.

Ultrasonic Activation of the Catalysts of Ethylbenzene Dehydration to Styrene

The ultrasonic treatment of Fe2-Bi-Mo2-Ox catalyst of ethylbenzene oxidative dehydration to styrene has been studied. Its physico-chemical properties have been compared with those of non-activated catalyst before and after operation. It has been shown that the catalyst prepared from salts solution activated by ultrasound has better activity and increases styrene yield under the same conditions.

Copolymerization of Peroxy Derivatives of Dioxydiphenylpropane Diglycidyl Ether Monomethacrylate with Styrene

The copolymerization reaction of peroxy derivatives of dioxydiphenylpropane diglycidyl ether monomethacrylate with styrene has been studied at 333 K in the medium of toluene using azo-bis-isobutyric acid dinitrile as an initiator at different molar ratio of the initial monomers. The reaction rates have been determined and copolymerization constants have been calculated. The structure of the synthesized copolymers was confirmed by chemical and IR-spectroscopic analyses