Translate and memorize the following words

UNIT IV WONDERFUL ALLOYS

Translate the text using a dictionary. Write out the words which are the terms for a) the properties and types of polymers; b) their uses.

An important section of polymer synthesis is concerned with production of heat resistant polymers capable of withstanding prolonged use at high temperatures. It was suggested that many polymers should be synthesized for this purpose. Very great advancements have been made in work on polymers designed for various electrical purposes, such as for production of insulators, electrically conducting materials, semiconductors, etc.

It should be noted that some inves­tigators have paid much attention to the problem of synthesis of polymeric semiconductors and superconductors. For this purpose polymers with conjugated bonds of the type of polyvinylene, polyacetylene, etc. and their derivatives have been prepared.

The problem of protection of the environment isclosely connected with the problem of production of polymers. This is particularly important in the case of packaging materials. This problem is to be solved in a number of ways, synthesis of special polymers being one of them.

On the other hand, practical necessity would give rise to the task of preparing non-flammable and self-extinguishing polymers, it being extremely important to the building industry and a number of branches of the new technology.

Another great problem is to find ways of preparing a wide assortment of polymers. It should be mentioned that each element makes its own contribution to the combination of properties. A clear example of this is provided by the organo-silicon polymers.

Grammar: The Review of the Participle II

Text: Brass

commercial	immediately	retain
malleable	occasionally	inherent
insufficient	whilst	presumably
unalloyed	appreciably	impermeable

2. Read and translate correctly:

on a commercial scale; whilst it is oxidized; insufficient to have any commercial impact; when unalloyed; the creep resistance; atmospheric corro­sion; the electro-negative character; partly ionic and partly covalent.

3. Pay attention to the word combinations in bold type, translate them into Russian:

1. As early as in 19th century... 2. This experiment is as important as.... 3. As far as this report is concerned.... 4. As far back as in 1947... 5. As late as in the 18th century occurs... 6. As long as this reaction occurs... 7. As soon as he comes.... 8. As early as 200 B.C…

4. Translate the following word combinations, mind the Participles II:

the method involved was; the experiment spoken of is; the lecture followed by the experiment took place; the data referred to must be; the report presented involved some data; the figures summed up resulted in; the book translated consisted of 2 parts; the work done helped greatly; the ore found contained; the solution used is to be heated.

5. Translate the following sentences, mind the Infinitives:

1. The copper to be used must be pure. 2. The metal is to be used in our experiment. 3. To use this solution we have to heat it. 4. To use these figures is to complete this, work. 5. The method seems to be useful in this work. 6. The work done proves to be of great importance. 7. They found this substance to melt at a low temperature. 8. The application of zinc is known to be important in heavy industry. 9. Zinc is known to be a silvery white metal. 10. This metal appears to be readily dissolved by most mineral acids.

6. Read the text, analyse the grammar constructions:

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