https://elib.belstu.by/handle/123456789/20521 Wed, 22 Apr 2026 03:27:55 GMT 2026-04-22T03:27:55Z https://elib.belstu.by/handle/123456789/6956 Title: Colloid-chemical properties of surfactant technical specimens used in cosmetics industry Authors: Emello, G. G.; Bondarenko, Zh. V.; Grukalova, Ye. V.; Firsova, L. D. Abstract: The surface-active and colloid-chemical properties of surfactant technical specimens Genapol LRO, Texapon K12G, TWEEN 20, TWEEN 80 and Cremophor A25 have been studied using different methods of analysis. The surface activity, adsorption, micelle formation and solubilization quantitative characteristics have been determined, hydrophilic-lipophilic balance has been calculated. It has been shown that the usage of the investigated specimens in cosmetic compositions is related to with their surface-active and colloid-chemical properties determining their function in cosmetics (stabilizer, emulsifier, solubilizer and others). Sun, 01 Jan 2012 00:00:00 GMT https://elib.belstu.by/handle/123456789/6956 2012-01-01T00:00:00Z https://elib.belstu.by/handle/123456789/6955 Title: Comparative analysis of diacylated peroxide methanol solution decomposition under temperature and microwave radiation Authors: Gaidukevich, O. A.; Skakovsky, Ye. D.; Tychinskaya, L. Yu.; Zveryeva, T. D.; Dicusar, Ye. A.; Lamotkin, S. A. Abstract: Thermolysis of benzoyl and acetylbenzoyl peroxides in methanol-d4 under temperature and microwave radiation treatment was studied. It was shown that chemical induced dynamic nuclei polarization can be observed even when reaction is carried out in spectrometers with high magnetic fields. In this case spin correlation in geminate radical pairs with labile aceloxy radicals persists. Equal quantity of products is obtained independent of the way of peroxide decomposition initiation. Homolysis proceeds according to chain mechanism. Contribution of induced decomposition decreases while reaction proceeding. Molecules of dissolved oxygen terminate the chain effectively, decreasing the rate of the reaction of peroxide decomposition. In the case of acetylbenzoyl yield of products depends of initiation mechanism: under microwave radiation treatment molecules of solvent are more active, but dissolved oxygen is less active than under thermolysis condition. Sun, 01 Jan 2012 00:00:00 GMT https://elib.belstu.by/handle/123456789/6955 2012-01-01T00:00:00Z https://elib.belstu.by/handle/123456789/6953 Title: Application of NMR spectroscopy in predicting hydrogel matrix stability by “stress” testing method Authors: Chernetskaya, Yu. G.; Lamotkin, S. A.; Trukhachyova, T. V. Abstract: The results of the study of hydrogel matrix stability by means of nuclear magnetic resonance spectroscopy are described in the article. Ionizing radiation effect on auxiliary substances and active ingredients of hydrogel polymeric matrixes have been studied. It has been proved that under the influence of high-velocity electrons at absorbed doses 25–35 kGy the formation of a three-dimensional polymeric structure of the matrix occurs. It has been ascertained that active ingredients of hydrogels miramistin and gentamycin are stable under absorbed radiation doses in the range 5–35 kGy. Sun, 01 Jan 2012 00:00:00 GMT https://elib.belstu.by/handle/123456789/6953 2012-01-01T00:00:00Z https://elib.belstu.by/handle/123456789/6952 Title: Structure and properties of composite materials from fibreglass wastes and thermosetting binder Authors: Kordikova, Ye. I.; Spiglazov, A. V.; Dubovik, I. N.; Cherenkevich, A. S. Abstract: The possibility of the use of ground fibreglass wastes as fillers and thermosetting resins as binders to manufacture the articles for household and constructive use have been studied. Parameters of the mechanical properties of materials with different fraction composition have been determined. Influence of the mechanical action on particle size has been studied. Experimental test for checking the possibility of component combination has been carried out. Quality of materials has been examined. Recommendations for the use of the existing technologies in the manufacture of articles have been worked out. The obtained results can be used in developing product design, in determining the areas and conditions of their effective application as well as in choosing technologies for their processing. Sun, 01 Jan 2012 00:00:00 GMT https://elib.belstu.by/handle/123456789/6952 2012-01-01T00:00:00Z