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RUBBER
Source: Э.Я.БАГ; Н.А.НЕЧАЕВА; Э.С.ЯРАЛОВА; 1963 Y.
Man had known natural rubber long ago.
The word “rubber” had come from its use in rubbing out the marks of a pencil.
The French word for rubber: caoutchouc probably comes from the native expression cahuchu which means “weeping wood.”
(Raw rubber is a white liquid, obtained from a tropical tree.)
Nowadays, the word rubber has in fact come to mean not a particular chemical substance, but a type of material, which can be stretched readily to at least twice its original length and which retracts rather rapidly when the strength is released.
Raw rubber is so tough that it was impossible to mix it with other substances until scientists had worked out a process for making it soft enough.
Rubber is vulcanized, that is, heated with sulphur at high temperatures, which makes rubber soft, insoluble and improves its natural properties, such as high tensile strength, good elongation and resistance to tear.
The price of natural rubber had always been high and with the increased demand for automobile tires and other articles it went still higher.
Many attempts were made to produce rubber synthetically, but they did not succeed until scientists had at last understood the structure of natural rubber.
As early as 1889 a French scientist converted a substance, which he had obtained from natural rubber, into a rubber like material.
By 1910 S.V. Lebedev had made a rubber-like compound from the simplest of hydro-carbons related to rubber.
Synthetic rubbers which are now being produced on a large scale, are in many respects superior to natural rubber.
No doubt, in a certain period of time their production will still have increased. By that time natural rubber will have lost much of its present importance.
Video by Teona Gvadzabia
#თეონა21 #Teona21
facebook.com/Teona21
E-mail: [email protected]
RUBBER
Source: Э.Я.БАГ; Н.А.НЕЧАЕВА; Э.С.ЯРАЛОВА; 1963 Y.
Man had known natural rubber long ago.
The word “rubber” had come from its use in rubbing out the marks of a pencil.
The French word for rubber: caoutchouc probably comes from the native expression cahuchu which means “weeping wood.”
(Raw rubber is a white liquid, obtained from a tropical tree.)
Nowadays, the word rubber has in fact come to mean not a particular chemical substance, but a type of material, which can be stretched readily to at least twice its original length and which retracts rather rapidly when the strength is released.
Raw rubber is so tough that it was impossible to mix it with other substances until scientists had worked out a process for making it soft enough.
Rubber is vulcanized, that is, heated with sulphur at high temperatures, which makes rubber soft, insoluble and improves its natural properties, such as high tensile strength, good elongation and resistance to tear.
The price of natural rubber had always been high and with the increased demand for automobile tires and other articles it went still higher.
Many attempts were made to produce rubber synthetically, but they did not succeed until scientists had at last understood the structure of natural rubber.
As early as 1889 a French scientist converted a substance, which he had obtained from natural rubber, into a rubber like material.
By 1910 S.V. Lebedev had made a rubber-like compound from the simplest of hydro-carbons related to rubber.
Synthetic rubbers which are now being produced on a large scale, are in many respects superior to natural rubber.
No doubt, in a certain period of time their production will still have increased. By that time natural rubber will have lost much of its present importance.
