https://elib.bsu.by:443/handle/123456789/14501 2026-04-21T08:18:51Z 2026-04-21T08:18:51Z https://elib.bsu.by:443/handle/123456789/23039 2016-04-12T11:27:45Z 2003-01-01T00:00:00Z

Заглавие документа: Chemical problems of the development of new materials and technologies. Issue 1. Аннотация: The main results of the scientific research work of RIPCP BSU within the 2000-2003 yy. are presented in the collection of papers

2003-01-01T00:00:00Z Egorov, V. V. Rakhman'ko, E. M. https://elib.bsu.by:443/handle/123456789/21986 2016-04-12T11:26:06Z 2003-01-01T00:00:00Z

Заглавие документа: Ion Association Effects of Lipophilic Quaternary Ammonium Salts in Ion-Exchange and Potentiometric Selectivity Авторы: Egorov, V. V.; Rakhman'ko, E. M. Аннотация: Strong effects of ion association on the anion-exchange selectivity in systems water -solutions of high quaternary ammonium salts (QAS) in organic solvents as well as on the potentiometric selectivity of plasticized polyvinylchloride (PVC) membranes containing QAS as ion exchangers have been established experimen¬tally and substantiated theoretically. Based on the linear Gibbs energy relations (LGER) and ion association theory by Eigen-Denison-Ramsey-Fuoss, an approach to separate estimation of the parts played by the solvation and ion association fac¬tors in ion-exchange and potentiometric selectivity has been proposed. The results obtained serve as the basis for revision of the formed notions about QAS as of «nonselective» ion exchangers and enable the development of methods for the con¬trol of ion-exchange and potentiometric selectivity using the factor of ion associa¬tion. Specifically, it has been demonstrated that variation of steric accessibility of the QAS exchange center is a powerful means to control the selectivity. It has been found experimentally that due to varying steric accessibility of the QAS exchange center the selectivity values have changed by 3 orders of magnitu¬de in case of single- charged anions exchanged for single-charged ones and by more than 7 orders - in case of double-charged anions exchanged for the sing¬le-charged ones. The above-mentioned effects revealed also in the potentiometric selectivity of QAS-based PVC membranes and to some extent - in the potentiometric selectivity of the membranes based on neutral anion carriers, doped with QAS for provision of anion permselectivity, are of great practical importance for the development of ISE with improved selectivity.

2003-01-01T00:00:00Z Kostyuk, S. V. Lesnyak, V. P. Gaponik, L. V. Mardykin, V. P. Kaputskii, F. N. https://elib.bsu.by:443/handle/123456789/21977 2016-04-12T11:25:22Z 2003-01-01T00:00:00Z

Заглавие документа: Lewis acid complexes: synthesis and application in polymerization processes Авторы: Kostyuk, S. V.; Lesnyak, V. P.; Gaponik, L. V.; Mardykin, V. P.; Kaputskii, F. N. Аннотация: The published works by the present authors on the synthesis of organoaluminium compounds and complexes there of are summarized. The study of the reactivity of these latter in stereospecific and alternating polymerization made it possible to produce effective catalysts for synthe-sizing superhigh molecular weight polyolefins, alternating copolymers. The detailed investigation of the properties of the organoaluminium complexes with ethers allowed working out new catalytic systems capable of initiating styrene living cationic polymerization. The revealed regularities of living polymerization of styrene allows to realize for the first time the controlled polymerization of industrial C9-fraction, with the obtained results being used for developing technology for production of aromatic hydrocarbon resins from C9-fraction. An industrial process was developed and employed to produce oligopiperylene and aromatic hydrocarbon resins, which are used as film-forming components in paint and varnish composition

2003-01-01T00:00:00Z Grinshpan, D. D. Savitskaya, T. A. Tsygankova, N. G. https://elib.bsu.by:443/handle/123456789/21367 2016-04-12T11:25:01Z 2003-01-01T00:00:00Z

Заглавие документа: Non-traditional solutions of cellulose and it's derivatives and their processing products Авторы: Grinshpan, D. D.; Savitskaya, T. A.; Tsygankova, N. G. Аннотация: The main achievements of the Laboratory of cellulose solutions and their processing products in the field of the elaboration of new cellulose dissolving processes, the homogeneous synthesis of cellulose derivatives, the elaboration of the incompatible polymer solutions stabilization, the creation of new film - fabric materials and filtering equipments on their base, the preparation of hard quickly disintegrated drug forms (tablets, granules) using new water soluble cellulose derivative have been summarized.

2003-01-01T00:00:00Z