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Directory / Winged words, phraseological units / What time is it in the yard - such is the messiah

Winged words, phraseologism. Meaning, history of origin, examples of use

Winged words, phraseological units

Directory / Winged words, phraseological units

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What time is it in the yard - such is the messiah

Voznesensky A.A.
Voznesensky A.A.

Phraseologism: What time is it in the yard - such is the messiah.

Meaning: Each time has its prophets and heroes, and they are such, what is the very time that gives birth to them.

Origin: From the poem "Requiem" (1980), which its author, the poet Andrei Andreyevich Voznesensky (1933-2010), wrote on the death of the actor and poet Vladimir Vysotsky (1938-1980): time in the yard - // Such is the messiah".

Random phraseology:

Sun of Austerlitz.

Meaning:

The symbol of the past victory.

Origin:

Here is the sun of Austerlitz! - exclaimed Napoleon, addressing his officers before the Battle of Borodino on August 26 (Sept. 7, New Style), 1812, when the sun rose over Moscow. With this phrase, he wanted to recall the victory he won near Austerlitz on December 2, 1805. "Russia, quarrelsome queen, // Remember the ancient rights! // Dim, the sun of Austerlitz! // Blaze, great Moscow!" (A. S. Pushkin, Napoleon.)

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Recyclable plastic 29.04.2018

American chemists have synthesized a polymeric material that, in terms of its mechanical properties and thermal stability, is not inferior to modern plastics. Its advantage is that this material can be recycled in a controlled manner, dismantled back into individual monomers. The monomers thus obtained are suitable for a new polymerization, whereby such a material can be used repeatedly.

One of the main advantages of modern plastics is their durability and resistance to external mechanical loads and small temperature changes. However, the fact that the chemical and mechanical properties of plastics do not change much over time has obvious negative consequences.

It is precisely because of the sustainability of plastic that it is almost impossible to recycle, as a result of which it gradually pollutes the planet, accumulates in the ocean and interferes with the life of marine ecosystems. Therefore, an important task of modern chemistry is the search for such polymeric materials that, on the one hand, have the necessary physical properties, and, on the other hand, can be easily recycled, after which they can be reused.

American chemists from the University of Colorado under the leadership of Eugene Y.-X. Chen have synthesized a new type of polymer material that has physical properties - density, elasticity and thermal stability - at the level of modern plastics and can be reused due to cycle of polymerization and reverse depolymerization reactions. The monomer of this compound was a molecule based on gamma-butyrolactone, in which two of the carbon atoms are additionally linked into a cyclic structure in the trans conformation. Such a monomer can be obtained quite easily and in large quantities using a two-stage synthesis from commercially available reagents.

The subsequent polymerization of the monomer is also quite easy: at room temperature using a very small amount of catalyst (no more than one mole percent) and in just a few minutes. In this case, two different types of catalyst can be used. Depending on the choice of one of them, one of two types of polymers will be formed: with a linear or cyclic structure. The average molecular weight of linear polymers ranged from 0,5 to 1 megadaltons, and that of cyclic polymers was about 80 kilodaltons.

In all their characteristics - molecular weight, thermal stability and mechanical properties, both types of polymer turned out to be very close to the types of plastic used now (in addition, each of the polymers can exist in two chiral conformations, but the racemic mixture of two enantiomers had the best properties). Thus, the melting temperature of the racemates of both the cyclic and linear polymers was about 190 degrees Celsius, the glass transition temperature was about 50 degrees Celsius, and the modulus of elasticity was about 2,7 gigapascals, which is comparable to the performance of modern plastic materials, for example, biodegradable polylactide.

Scientists call the main advantage of the synthesized polymer the possibility of its multiple processing using depolymerization, which can be carried out either by thermolysis at temperatures above 300 degrees Celsius, or at more moderate temperatures (about 120 degrees Celsius) in the presence of zinc chloride ZnCl2. The yield of decomposition reactions was about 97 percent. The monomers formed during depolymerization do not differ in their properties from the initial state, and they can be reused to obtain the desired polymeric material.

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