DSpace Collection:https://elib.belstu.by/handle/123456789/207772024-03-29T05:01:40Z2024-03-29T05:01:40ZResearch of influence of various carbon black types on technical properties of rubbersShashok, Zh. S.Uss, E. P.Kasperovich, A. V.https://elib.belstu.by/handle/123456789/209172020-10-21T07:37:11Z2016-01-01T00:00:00ZTitle: Research of influence of various carbon black types on technical properties of rubbers
Authors: Shashok, Zh. S.; Uss, E. P.; Kasperovich, A. V.
Abstract: The influence of carbon black types P-803 and S800 on elastic, strength and deformation properties of rubbers intended for production of molded rubber products has been studied. As objects of research the rubber mixtures based on combination of general purpose rubber SRI-3+SRD and special purpose rubber BNRS-18AMN were used. The studies of chemical composition of the surface of various carbon black types revealed that the surf ace of carbon black type S800 contains a large amount of sulfur and a minimal amount of oxygen, the presence of which may influence the curing process, and consequent-ly on the elastic and mechanical properties of rubbers . It was established that P-803 carbon black type substitution by S800 type leads to increase in streng th characteristics, Shore A hardness and to decrease in relative compression set of vulcanizates based on BNRS-18AMN. In rubber based on combination of rubbers SRI-3+SRD with carbon black type S800 re vealed decrease resistance against growth tears and increase Shore A hardness of vulcani zates, compared with samples of rubber with carbon black type P-803. The character of changes in rubber properties may be due to the influence of the carbon black type on the structure and density of curing grid.2016-01-01T00:00:00ZFoaming properties of surfactants’ water solutions of Zetesol groupEmello, G. G.Bondarenko, Zh. V.Kharlan, T. V.https://elib.belstu.by/handle/123456789/209162020-10-21T07:37:11Z2016-01-01T00:00:00ZTitle: Foaming properties of surfactants’ water solutions of Zetesol group
Authors: Emello, G. G.; Bondarenko, Zh. V.; Kharlan, T. V.
Abstract: Foaming process in surfactants’ water solutions of ZETESOL ZN and ZETESOL MG in concentration 0.01–5.00 g/l has been investigated. The Ross-Miles device has been used to obtain foams. The foam ability was characterized by the initial foam volume and foam stability. It was proved that optimal foaming ability has been observed with concentr ation of above-mentioned surfactants above 0.2 g/l. All received foams have been highly resistant. Besides, it was established that foam stability of preparations depends on surface-active and colloidal-chemical properties. Studying the kinetics of foam stability showed that foam destructions happen ed at first 3.5 minutes of existence. The composition of hygienic detergent was developed based on experimental data. The detergent prototype was analyzed on the main organoleptic a nd physicochemical characteristics. The carried out analysis of prototype proved its compliance to requirements of STB 1675-2006 “The cosmetic hygienic
washing products. General characteristics”.2016-01-01T00:00:00ZFree base and protonated form fluorescence of the mixed 5,10,15,20-arylporphyrinsKruk, M. M.Vershilovskaya, I. V.Ngo, T.Scheblykin, I. G.Dehaen, W.Maes, W.https://elib.belstu.by/handle/123456789/209152020-10-21T07:37:11Z2016-01-01T00:00:00ZTitle: Free base and protonated form fluorescence of the mixed 5,10,15,20-arylporphyrins
Authors: Kruk, M. M.; Vershilovskaya, I. V.; Ngo, T.; Scheblykin, I. G.; Dehaen, W.; Maes, W.
Abstract: Fluorescence spectra for a series of mixed phenyl-mesityl 5,10,15,20-tetraarylporphyrins – with Mes4, Mes3Ph, Mes2Ph2- trans, Mes2Ph2- cis, MesPh 3 and Ph4 type architecture (Mes – mesityl, Ph – phenyl) – in their free base, mono- and diprotonated form are reported. Substitution of a single mesophenyl group with a sterically more demanding mesityl group is found to be sufficient to provide stabi-lization of the monoprotonated porphyrin species. A decrease in the number of mesityl substituents in the macrocycle leads to a decrease in the fluore scence quantum yield for protonated forms. The pro-gressive replacement of ortho,ortho’-substituted mesityl groups with unhindered phenyls results in the additive pattern of spectral changes for the free base porphyrins, whereas for both protonated species a specific jump at the trans to cis transition is observed, along with a gradual additive pattern before and afterwards. This feature is interpreted as a signature of the transition between the hindered-like and un-hindered-like conformations of the tetrapyrrolic m acrocycles in the protonated forms. These two mo-lecular conformations provide a different interaction of the two one-electron (a1u,eg) and (a2u,eg) configurations, which leads to changes of their contributions into electronic transitions.2016-01-01T00:00:00ZApplying additive-modifiers in dewaxing raffinate processGrushova, E. I.Al-Razuki, A. A.Miloserdova, O. A.Chaiko, E. S.https://elib.belstu.by/handle/123456789/209142020-10-21T07:37:11Z2016-01-01T00:00:00ZTitle: Applying additive-modifiers in dewaxing raffinate process
Authors: Grushova, E. I.; Al-Razuki, A. A.; Miloserdova, O. A.; Chaiko, E. S.
Abstract: Dewaxing petroleum oil raffinates is carried out by low-temperature rectification in sovents acetone – toluene. To intensify the process as an additive-modifier we used ε -caprolactam. Analysis of structural-group composition dewaxed raffinate by infrared spectroscopy showed that in the presence of ε -caprolactam selectivity of dewaxing is increased due to smaller content slack aromatic, branched paraffins and oxygenates structures. However, if the content of ε -caprolactam > 1 wt % selectivity of separation is reduced, apparently by increasing solvent power system acetone – toluene ( ε -caprolactam).2016-01-01T00:00:00Z