Influence of the concentrations of the components and preparation procedures on the relaxation transitions in blends of polyvinyl chloride with butadiene-acrylonitrile elastomers

The temperature dependence of the tangent of the mechanical loss angle tan δ-T and the nature of the relaxation transitions were examined for model blends of polyvinyl chloride with butadiene-acrylonitrile elastomers.     

Investigation of the formation of poly(ethylene terephthalate) with model molecules: Kinetics and mechanisms of the catalytic esterification and alcoholysis reactions. II. Catalysis by metallic derivatives (monofunctional reactants)

The reactions of model molecules were considered to study the kinetics and the mechanism of the esterification and the alcoholysis reactions catalyzed by various metal compounds (Li, Na, K, Zn, Co, Mn, Ti). Ti was found to be the most active catalyst for both reactions and to be acting via a different mechanism (concerted). The possible structure of the active titanium intermediate was investigated by means of ¹H- and ¹³C-NMR spectroscopy, FT–IR spectroscopy, and electroconductivity.     

Estimate of the reactivity of acid chlorides of mono- and dicarboxylic acids

Russian Chemical Bulletin -     

Silatrane-containing poly(β-amino esters)

Russian Chemical Bulletin - A series of poly(β-amino esters) were synthesized using the Michael addition reaction from 1-(3-aminopropyl)silatrane and glycol diacrylates. The structure of the...     

New magnetic nanomaterials based on ferrocene-containing polymers synthesized under ultrasonic irradiation

Russian Chemical Bulletin - A new magnetic nanomaterial was obtained based on soluble ferrocene-containing poly-phenylene synthesized under ultrasonic irradiation at room temperature. The maximum...     

Study of intermolecular interactions in the equilibrium catalytic transesterification of esters

The interaction of alcohols ROH with esters PhCOOR (R = Me,n-Bu,n-C₇H₁₅) in binary mixtures and in solutions in non-polar solvents (CCl₄, cyclohexane) was studied over a wide temperature range by Fourier IR spectroscopy. Even with a great excess of alcohol (up to 3000-fold molar excess), two bands are observed in the region ofv(CO) vibrations. The low-frequency band, which is down-shifted by 15–20 cm^–1 with respect to thev(CO) band in the absence of alcohol, corresponds to ester molecules bonded by hydrogen bonds of the C=O...HO type. The high-frequency band is up-shifted by 3–5 cm^–1 with respect to the esterv(CO) band. The discreteness of the shift, which is confirmed by the appearance of an isobestic point, indicates that an H-complex of yet another type is formed between the alcohol and the ester. The analysis of the data available allows one to conclude that complex formation involves the alkoxyl oxygen atom of the ester. The enthalpies of formation were determined forn-BuOH H-bonds with the esters and with the transesterification catalysts, i.e., As(OBu)₃, B(OBu)₃, and Ti(OBu)₄.Part 3 — see ref.1Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 709–713, April, 1993.