Nanoparticles have proven to be successful catalysts for oil combustion. To maximize their catalytic performance, it is necessary provide nanoparticle aggregation stability during the combustion process. The classical approach stabilization of nanoparticles assumes application different stabilizers, like surfactants or polymers, attached particles' surfaces, preventing via steric electrostatic repulsion. Thus, determined by thermal surfactant- polymer-based coatings, which not sufficient...

Bulk azide-alkyne cycloaddition between 1-azidodecane and phenyl propargyl ether is studied in detail under the conditions of linear heating. The reaction mechanism involves two parallel channels that respectively yield isomeric 1,4- 1,5-adducts. Remarkably, ratio isomer amounts remains practically same at different heating rates. It argued this unusual effect a sign unique kinetics when have equal activation energies. Isoconversional analysis differential scanning calorimetry data supports...

New p-tert-butyl thiacalix[4]arenes differently substituted at the lower rim with amide, hydroxyl and ester groups were synthesized. Binding properties of compounds toward some tetrabutylammonium salts n-Bu4NX (X = F−, Cl−, Br−, I−, CH3CO2−, H2PO4−, NO3−) studied by UV spectroscopy. It was found that stoichiometry complexes, generally, is 1 : 1, association constants are in range 103–105 M−1. The containing secondary amide trisubstituted bind anions most effectively. Selective receptors for...

Solid-state polymerization of a cyclic cyanate ester shows zero-order kinetics and proceeds through cooperative breaking CN bonds.

A new rigid tricyanate ester consisting of seven conjugated aromatic units is synthesized, and its structure confirmed by X-ray analysis. This undergoes thermally stimulated polymerization in a liquid state. Conventional temperature-modulated differential scanning calorimetry techniques are employed to study the kinetics. transition from kinetic- diffusion-controlled regime detected. Kinetic analysis performed combining isoconversional model-based computations. It demonstrates that...

In the present study, we investigated in detail influence of depyritization procedure on structure and morphology organic matter Bazhenov shale. We monitored both structural morphological properties shale during chemical treatment by a complex physical methods, including different types spectroscopies, scanning electron microscopy, physisorption analysis. also applied non-istothermal kinetic analysis to study effect inherent pyrite pyrolysis kerogen wide temperature range showed that...

This study investigates the kinetics of confined polymerization bisphenol E cyanate ester in nanopores three types silica colloidal crystals that differ concentration and acidity surface-grafted proton-donor groups. In all pores, has released less heat demonstrated a very similar significant acceleration as compared to bulk process. Isoconversional kinetic analysis differential scanning calorimetry measurements revealed confinement causes not only dramatic change Arrhenius parameters, but...

The mechanism of thermally stimulated polymerization tricyanate ester remains the same in solution as melt, but Arrhenius parameters rate-limiting reaction are significantly affected by solvation.

Abstract A novel dicyanate ester, which constitutes the first member of family linear oligomers 4‐ tert ‐butyl‐phenol, is synthesized as a part systematic study on relation between reactivity cyanate esters and their structure. The monomer undergoes thermally stimulated polymerization in melt. kinetics studied by conventional temperature‐modulated DSC. Detailed isoconversional analysis obtained kinetic data has revealed that process rate limited single reaction step auto‐catalytic nature....

New p-tert-butyl thiacalix [4]arene derivatives containing simultaneously the 4-amidoazobenzene and ethoxycarbonyl fragments at lower rim in cone 1,3-alternate conformation of tri-and tetrasubstituted derivatives, correspondingly, were synthesized.It was shown that replacement hydroxyl group by fragment a 1,3-disubstituted macrocycle with groups leads to binding fluoride-and chloride-anions.The substitution two dramatically changed properties derivative.

New tetrasubstituted at the lower rim thiacalix [4]arenes containing both (ethoxycarbonyl)methoxy and 1-amidoanthraquinone fragments in three conformations: cone, partial cone 1,3-alternate were synthesized.It was shown that depending on alkali metal cation (sodium, potassium or cesium) alkylation of diester based p-tert-butylthiacalix [4]arene by 2-bromo-N- (9',10'-dioxo-9',10'-dihydroanthracene-1'-yl)acetamide template effect observed.The fluorescent properties obtained compounds studied.

A convenient approach to the synthesis of multithiacalix[4]arene derivatives containing amino groups and phthalimide fragments by formation quaternary ammonium salts is presented. As initial macrocycle for multithiacalix[4]arenes, a differently substituted p-tert-butylthiacalix[4]arene bromoacetamide three was used in 1,3-alternate conformation. The cone conformation tertiary found be core systems. Interaction with monobromoacetamide resulted high yields pentakisthiacalix[4]arene fragments....

New monosubstituted pentakisthiacalix [4]arenes in three different configurations (cone, partial cone and 1,3-alternate) were synthesized their structure composition characterized by a number of physical methods including 1 H, 13 C, IR spectroscopy mass spectrometry.The spatial was confirmed two-dimensional H-1 H NMR spectroscopy.It shown that nano-sized aggregates with silver cation formed only the case multicalixarene configuration central core.

This study highlights the value of nonisothermal kinetic methods in selecting temperature conditions for isothermal preparation microporous polymeric materials. A dicyanate ester is synthesized and kinetics its polymerization diphenyl sulfone are studied by calorimetry under conditions. The analyzed a model-based approach, using Kamal model, as well model-free an advanced isoconversional method. Both approaches correctly predict time to completion at given temperature. material prepared...

It was shown that the chemo-and stereoselective alkylation of lower rim 1, 3-disubstituted p-tert-butyl thiacalix[4] arenes in cone conformation using 2-chloro-N,N-diethylacetamide is determined by both nature base and position anthraquinone fragment relation to amide group: case 1-amidoanthraquinone derivative, tetrasubstituted products are produced, 2-amidoanthraquinone trisubstituted macrocycles formed.It established introduction N,N-diethylacetamide fragments at 1,3-disubstituted leads...

New tetrasubstituted p-tert-butylthiacalix [4]arenes containing 2-, 3-, and 4-picolylamine fragments at the lower rim in 1,3-alternate conformation were synthesized.It was shown that macrocycles synthesized are able to bind selectively phthalic acid series of dicarboxylic (oxalic, malonic, succinic, adipic, glutaric, fumaric, maleic, isophthalic terephthalic) hydroxy (glycolic tartaric) acids.

We described a synthetic approach to bisphenol-based monocyanate esters based on mono-O-methylation of parental bisphenols followed by cyanation the residual phenolic hydroxyl. Structures synthesized compounds were determined application IR, NMR ¹H and 13C spectroscopies, EI MALDI mass spectrometry, purity final product was controlled HPLC. showed that stability cyanate depends nature bridging group. Temperature range thermally initiated cyclotrimerization ester, as well reaction enthalpy,...

Two flexible α-azide-ω-alkynes differing in the length of hydrocarbon spacers (C8 vs. C12) between functional groups are synthesized. Their bulk polymerization kinetics is studied by differential scanning calorimetry (DSC) and parameterized with aid isoconversional methodology. The monomer a shorter spacer has somewhat greater reactivity. effect traced to moderate increase effective value preexponential factor that arises from fact respective higher initial molar concentration itself....