A 20 Adamova, L. V. Thermodynamics of mixing of polybutadienes different molecular structure [Text] : доклад, тезисы доклада / L. V. Adamova, E. V. Sevenard, A. P. Safronov // 7 Int. Conf. "The Probl. Solvat. and Complex Format. Solut", Ivanovo, June 29 - July 2, 1998. - Ivanovo, 1998 Рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: Исследовано влияние структуры полибутадиеновых каучуков на термодинамику их взаимодействия с хлороформом. Значения энергий Гиббса смешения (дельта Gx) для полибутадиенов определены из данных по изотермической сорбции паров хлороформа. Энтальпии смешения (дельта Hx) измерены с использованием микрокалориметра ДАК-1-1. Энтропии смешения (дельта Sx) рассчитаны из значений дельта Gx и дельта Hx |
S 73 Sorbents based on modified polysiloxanes [Text] / L. K. Neudachina, A. Y. Golub, Yu. G. Yatluk, V. A. Osipova, Yu. A. Berdugin, E. M. Gorbunova, L. V. Adamova, O. V. Koryakova, M. V. Kuznetsov // Inorganic Materials. - 2011. - Vol. 47, № 4. - P435-441 : ил. - Bibliogr. : p. 441 (15 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: Organic-inorganic hybrid sorbents based on a polysiloxane modified with amino and thiourea groups have been synthesized for the first time by a sol-gel process. The structure of the sorbents has been determined by X-ray photoelectron spectroscopy and IR spectroscopy. Their thermal stability has been assessed and the mechanism of their degradation has been elucidated. The structural and adsorption parameters of the sorbents have been evaluated. The results demonstrate that the introduction of amino groups into the structure of the polysiloxane yields an effective sorbent for Pb(II) extraction and enables Cu(II) and Zn(II) separation from Co(II) and Ni(II). The thiourea-modified polysiloxane selectively sorbs Bi(III) (0.1-2 M HCl), Pt(IV) (pH 2), and Pb(II) (pH 3). Divalent Co, Ni, Cu, and Zn can be sorbed from alkaline solutions \\\\Expert2\\nbo\\Inorganic Materials\\2011, v.47, N 4, p. 435.pdf |
S 98 Synthesis and surface structural characteristics of new polysiloxane xerogel [Electronic resource] / A. S. Zasuhin, L. K. Neudachina, Yu. G. Yatluk, L. V. Adamova, O. A. Osipova, E. M. Gorbunova, Yu. S. Moskaleva, T. Yu. Lapina // Russian Journal of Physical Chemistry A, Focus on Chemistry. - 2011. - Vol. 85, № 3. - P478-482 : ил. - Bibliogr. : p. 482 (24 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: Pyridylethylaminopropylpolysiloxane xerogel (PEAPPSX) was synthesized by sol-gel technology. The composition of the substance was determined via elemental analysis and 1H NMR spectroscopy. The surface structural characteristics of the xerogel were determined by electron microscopy and low-temperature nitrogen sorption; thermal analysis was also performed. It was established that the content of functional groups in PEAPPSX was 2.43 mmol/g, and that xerogel is a mesoporous substance with a developed surface (121.71 m(2)/g) \\\\Expert2\\nbo\\Russian Journal of Physical Chemistry A, Focus on Chemistry\\2011, V.85, N 3, p.478.pdf |
S 70 Sol-Gel Synthesis and Physicochemical Properties of Organosilicon Materials Functionalized by Amino Groups / L. K. Neudachina, N. V. Lakiza, A. V. Pestov, V. A. Osipova, L. V. Adamova, E. M. Gorbunova // Glass Physics and Chemistry. - 2011. - Vol.37, № 5. - С. 537-544 Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): "SOL-GEL" MATERIALS -- AMINOPOLYSILOXANES -- SPECIFIC SURFACE AREA Аннотация: The hybrid materials based on polysiloxane modified by amino groups have been synthesized by the sol-gel method. Aminated polysiloxane has been prepared by the copolycondensation reaction of tetraethoxysilane with gamma-aminopropyltriethoxysilane (APS-1) and through the modification of the product (APS-2) of the hydrolysis of tetraethoxysilane by gamma-aminopropyltriethoxysilane. The composition of sorbents has been confirmed by the elemental analysis and IR Fourier spectroscopy. The high degree of sorption extraction of copper(II), nickel(II), cobalt(II), zinc(II), cadmium(II), and lead(II) ions in the case of their coexistence in an ammonia-acetate buffer solution has been observed for polysiloxanes APS-2. The synthesized surface-modified materials exhibit the highest selectivity to nickel(II) and cobalt(II) ions \\\\Expert2\\nbo\\Glass Physics and Chemistry\\2011, V. 37, N 5, P.537-544.pdf |
N-Substituted-3-aminopropylsilsesquioxanes: synthesis, physicochemical properties, and application / M. E. Evseev, A. S. Kholmogorova, L. K. Neudachina [et al.] // Russian chemical bulletin. - 2021. - Vol. 70, № 6. - P1154-1160 Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): SILSESQUIOXANES -- SOL-GEL -- CARBON PASTE ELECTRODES -- RUBEANIC ACID -- DETERMINATION OF SILVER(I) Аннотация: Synthesis and study of the physicochemical properties of silsesquioxanes modified with 3-aminopropyl, 2-aminoethyl-3-aminopropyl, and dithiooxamide groups was carried out. The obtained sorbents were characterized by thermal stability, porosity, and a high degree of functionalization; the concentration of groups grafted to the particle surface reached 2.80 mmol g−1. Modified silsesquioxanes were used as an electroactive substance for the development of indicator carbon paste electrodes (CPEs). When using a CPE with a 5% dithiooxamidated silsesquioxane content, the conditions selected for potentiometric titration of aqueous solutions containing silverI were pH 3–4, the titrant was potassium iodide. The designed sensor was successfully tested by analyzing a standard sample and a drug for silver ion content. |