Изучены реакции полимеризации этилена на комплексах CoCl2 и FeCl2 с N,N,N-тридентатным лигандом, 2,6-бис[1-(2,6-диметилфенилимино)этил]пиридин (L).

The polymerization of ethylene and propylene and the copolymerization of ethylene with 1-octene with novel type of post-metallocene catalysts containing ionic complexes [2L·M@dibenzo-18-crown-6]+ [TiCl5·L]– (L = CH3CN, M = Li, K) are studied. The binary activator Al(C2H5)2Cl/Mg(C4H9)2 at [Al] : [Mg] 3 is used as a cocatalyst. A linear crystalline polyethylene, an almost fully amorphous, atactic polypropylene, and statistical ethylene-1-octene copolymers containing from 2 to 9 mol

With the use of quantum-chemical and kinetic methods, the influence of free amino groups in amine monomers on the rate of their reaction with ethylene carbonate is studied. It was stated that the catalytic effect in diamine appears at the length of the chain of 3–7 atoms. A decrease in activation barriers is associated with the formation of less strained proton transfer and stabilization cycles in transition states. The theoretically found dependence of the rates of aminolysis of ethylenecarbonate on the structure of amines is confirmed experimentally by kinetic measurements.

A novel catalyst system containing a complex of Ti4+ with a (O,N,O)-tridentate phenoxyimine ligand and a binary Al(C2H5)2Cl/Mg(C4H9)2 activator at a molar [Al]/[Mg] ratio of 3 affords the synthesis of ethylene polymers with molecular weight in excess of 1 × 106. Ethylene homopolymer produced at 35°C has Mw 2.6 × 106 and ethylene copolymers with small amounts (below 1 mol

Изучены реакции полимеризации этилена, пропилена и сополимеризации этилена с октеном-1 на новом типе пост-металлоценовых катализаторов, осно- ванных на анионе TiCl5 – и комплексах Li+ и K+ с краун-эфиром. Оба комплекса в кристаллическом состоянии сольватированы ацетонитрилом.

The polymerization filling method is used to obtain nanocomposites based on ultrahigh molecular weight polyethylene (UHMWPE) and graphene at with an ultralow content of 0.0065–0.019 vol %. The melting points and degrees of crystallinity of the obtained composites are close to the corresponding characteristics of unfilled UHMWPE. The strain-strength properties under the tension of the samples of the obtained composites are studied depending on the content of graphene. It is shown that the tensile strength of the composites increases significantly with an increase in the graphene content to 0.012 vol % compared to unfilled UHMWPE with a subsequent decrease. The relative elongation changes in a similar way.

Исследованы термоокислительные и трибоокислительные свойства композитов СВМПЭ/графен со сверхнизким содержанием графена. Композиты получали методом полимеризации in situ с содержанием наполнителя от 0,014 до 0,05% масс. Введение графена в СВМПЭ приводит к существенному улучшению трибоокислительных свойств, но практически не влияет на термоокисление. Это объясняется различными механизмами процессов термоокисления и трибоокисления в композите. The thermooxidative and tribooxidative properties of UHMWPE/graphene composites with an ultra-low graphene content are studied. Composites were prepared by in situ polymerization with a filler content of 0.014 to 0.05% by weight. The introduction of graphene into UHMWPE leads to a significant improvement in tribo-oxidative properties, but it practically does not affect on thermal oxidation. This is explained by various oxidation mechanisms that are implemented in the process of thermal oxidation and tribooxidation in the composite.

Reactor polymer compositions (RPCs) based on UHMWPE with M w = 1000 kg mol –1 and low molecular weight HDPE (LMWPE) were studied. Two series of UHMWPE compositions were used to determine the influence of the molecular weight and properties of the LMWPE fraction on the morpho-logy, mechanical and rheological properties of UHMWPE/LMWPE. Сompositions, including from 10 to 80 wt % UHMWPE with M w = 160 kg mol –1 (PE-160) were obtained in a two-stage process of ethylene polymerization with a metallocene catalyst. They differed in the order of introduction of PE-160 into UHMWPE (PE-160/UHMWPE and UHMWPE/PE-160). Compositions of UHMWPE and LMWPE with M w = 48 kg mol –1 (PE-48/UHMWPE) with PE-48 content from 6 to 30 wt % were synthesized in a single-stage polymerization of ethylene in the presence of a tandem catalyst. A comparison of the shape and size of particles of nascent polymer products was made using the SEM method. The morphology, tensile, dynamic mechanical and rheological properties of RPC have been studied depending on the method of their preparation, the content of the low molecular weight fraction, its molecular weight and physical and mechanical properties. An increase in the proportion of PE-160 and PE-48 in PE-160/UHMWPE and PE‑48/UHMWPE leads to an increase in RPC crystallinity, tensile modulus and dynamic mechanical modulus with significant deviations from the additivity rule.

В последнее время наблюдается растущий интерес к привлечению лазеров в производстве электронных компонент и интегрированных монтажных плат с целью упрощения производства и снижения веса электронных приборов.

Composites based on polypropylene and binary carbon nanofillers (graphene particles and single-walled carbon nanotubes) have been synthesized by in situ polymerization using the homogeneous isospecific metallocene catalyst rac -Me 2 Si(2-Me-4-PhInd) 2 ZrCl 2 activated by methylaluminoxane. The use of binary carbon nanofillers increases thermal stability and resistance to thermo-oxidative degradation and affects the reflectance and other electrical characteristics of synthesized materials. It has been shown that the binary nanofillers can have a synergistic effect on the thermal oxidation of polypropylene. The introduction of even a small amount of single-walled carbon nanotubes into graphene nanoplatelets significantly reduces the reflection coefficient of the resulting composite materials.

The effect of thermal oxidation on the crystalline phase of polypropylene in composites with single-walled carbon nanotubes has been studied. The composites are synthesized in propylene bulk using a homogeneous catalytic system rac -Me 2 Si(2-Me-4PhInd) 2 ZrCl 2 , activated by methylaluminoxane. The effect of thermal oxidation on thermophysical characteristics (the heat of melting and the melting temperature) measured by DSC and changes occurring in the polymer investigated by IR spectroscopy is studied. Changes in the structure of PP during thermo-oxidative degradation are studied by DSC at 140 and 170°С, that is, before and after melting of the samples. It is shown that the oxidized PP in the composites possesses a higher degree of crystallinity and a more perfect structure than the pure PP. At 170°С the effect of thermo-oxidative stabilization is observed only at low filling degrees (up to 3 wt %), in agreement with the TGA data. An analysis of IR spectra demonstrates that the presence of nanotubes in PP‑based composites during oxidation slows down the formation of oxygen-containing groups in the polymer. The conclusion is made that carbon nanotubes inhibit the thermal oxidation of polypropylene in the composites.

Уважаемые коллеги!Благодарим Вас за проявленный интерес к Четвертой российской конференции «Графен: молекула и 2D кристалл» и желание принять участие в её работе.Конференция проходит в научно-образовательном центре города Новосибирска -Академгородке.Мероприятие посвящено актуальным направлениям исследований и разработок в области углеродных и низкоразмерных материалов.Проведение конференции поможет координации усилий ученых в решении современных проблем материаловедения и привлечению молодых исследователей для решения актуальных научных задач.Оргкомитет выражает особую благодарность НГУ, Центру компетенций НТИ «Моделирование и разработка новых функциональных материалов с заданными свойствами», компаниям «Диаэм», «НТ-МДТ Спектрум Инструментс» и корпорации "Графеновая Долина" за финансовую поддержку и журналам Аналитика, Наноиндустрия и РЭНСИТ за информационную поддержку.Искренне надеемся, что пребывание в Новосибирском Академгородке и в стенах Новосибирского государственного университета оставит множество положительных эмоций и

The influence of the substituents inductive effect and the proton-donor OH group in the substituted cyclocarbonates differing in the alkyl chain length on the activation barrier of their aminolysis reaction, which underlies the process of urethane formation without the participation of isocyanates, has been studied. Account for the solvent molecules has allowed quantitative interpretation of the process regularities. Kinetics of the model aminolysis reaction of a series of monomers in DMSO has been investigated.

Thermal properties of more than 20 different polyureas intended for the use as protective varnish for printed-circuit boards have been studied. Rate and completeness of the polyureas decomposition as well as their solubility in common solvents have been analyzed. It has been shown that the polyureas synthesized from branched diisocyanates, for example, isophorone diisocyanate or 1,3-bis-(isocyanatomethyl)cyclohexane, and diamines (N,N′-dialkylethylene and propylenediamine) are prone to fast and complete decomposition at relatively low temperature. For instance, the polymer formed via the reaction between piperazine and isophorone diisocyanate has been completely decomposed at 400°C within 1 min, whereas degree of decomposition of the polymer obtained from piperazine and hexamethylene diisocyanate has been as low as 31% under the same conditions. The relationship between the completeness of the polyureas decomposition and the shape of their thermogravimetric analysis curves has been stated.