Nerve relief. Drawing, description

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Nerve relief. Tips for a modeler

Modeling

Modelers know how difficult it is to lighten a thin rib without compromising its strength. In the aircraft modeling circle of our House of Pioneers, the sawing method has been successfully replaced by die-cutting.

At the same time, the strength of the part is not violated and the work is done much faster. Holes are punched with tubes of different diameters, sharpened at the end on a lathe (such as a punch or punch).

Rib relief

This method is acceptable not only for lightening the ribs, but also in the manufacture of fuselages, keels in many other parts.

Author: A. Buyanov

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Sulfur Applications in Unusual Polymers 05.07.2020

Most of the sulfur goes to the production of sulfuric acid and mineral fertilizers, but there is still too much "unnecessary" sulfur. It is cheap, it is usually stored in the open air in the form of real sulfur mountains several tens of meters high. And this creates problems: firstly, the wind carries dust particles of sulfur, and secondly, under the influence of atmospheric oxygen and various microorganisms, sulfur is gradually oxidized up to sulfuric acid.

In all this, there is nothing good either for the environment or for the people and animals living near such places. Therefore, many chemists have been struggling with the problem of what useful things can be done from sulfur for many years. And great success in this was achieved by a group of researchers from the University of Liverpool.

Scientists have developed a method of "reverse vulcanization" - the synthesis of an unusual polymer based on sulfur. The essence of "normal" vulcanization is that long mobile polymer molecules, for example, natural rubber are sewn together by short "bridges", for example, from the same sulfur, making the material more durable. This method is the basis for rubber production. During vulcanization, sulfur acts as a kind of molecular paper clip.

However, sulfur has a unique feature - it can itself form quite long chains. And here it becomes possible to do the opposite - to use sulfur not as paper clips for polymers, but as a polymer itself. True, such sulfur chains in their pure form turn out to be short-lived and rather quickly fall apart into fragments. This is where "reverse vulcanization" comes in handy, the purpose of which is to cross-link long and brittle sulfur polymer molecules with small molecules.

Thanks to reverse vulcanization, it is possible to turn large volumes of "useless" sulfur into a completely useful polymeric material. Recently, researchers from the University of Liverpool and the University of Flinders presented new results - they managed to significantly improve the characteristics of the "sulfur polymer" by developing a technology for its production in two separate stages (they make it possible to obtain a polymer with the required characteristics), and in addition, to show that such polymers materials can be repaired after damage and even recycled.

If this technology is developed, then we will be able not only to solve the problem of an excess of sulfur obtained from oil and gas, but also to create completely new and cheap polymeric materials.

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