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Why are rubber structures different from rubber sources
Segment: aggregation of branches of rubber macromolecular chains to form a gel. Gelatine is unfavorable to the performance and processing of insulating rubber board. In the mixing of rubber, a variety of additives are often not into the gel zone, forming a local blank, the formation of reinforcement and crosslinking, become the weak part of the product.
Linear construction: the general construction of unvulcanized rubber. Because of its large molecular weight, the macromolecular chain is a random curve cluster without external force. When the external force is applied and the external force is removed, the entanglement degree of the line group changes, and the molecular chain bounces, generating a strong recovery tendency. This is the origin of the high elasticity of rubber.
Branch chain structure: aggregation of the branches of rubber macromolecular chains to form a gel. Gels are bad for rubber properties and processing. In the mixing of rubber, a variety of additives are often not into the gel zone, forming a local blank, the formation of reinforcement and crosslinking, become the weak part of the product.
Crosslinked structure: linear molecules are connected to each other through a bridge of atoms or groups, forming a three-dimensional network. As the curing process progresses, the structure is strengthened. In this way, the chain segment of free movement ability decreases, plasticity and elongation decrease, strength, elasticity and hardness increase rubber, why not the rubber structure compression permanent deformation and swelling degree decreases.
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According to literature, these balls are so resilient that visiting spaniards once thought they were possessed by evil spirits. Rubber is also used as a strap to fasten wooden handles to stone or metal utensils, and as filler for handles.
Mayans can use rubber to make shoes. Although the native americans did not vulcanize rubber as formally as modern humans, they were able to use organic matter for similar purposes, such as mixing raw emulsions with the SAP of different species or the SAP of some vines.
Some indigenous brazilians use rubber to make waterproof fabrics. There had been reports of Portuguese men bringing them back to their home countries, who had frightened their fellow countrymen and had been tried for witchcraft.
When rubber was introduced to Britain, it was found to be very effective in erasing pencil marks. So now the English word for rubber is also used to describe an eraser. Interestingly, americans today are used to refer to rubber as an eraser or a condom.
The natural source of rubber is the three-leaf rubber tree which supplies the most commercial rubber. It secretes a lot of SAP rich in rubber emulsions when it is injured. Others, FIG trees and some euphorbia plants also supply rubber.
Germany tested rubber from these plants during world war ii, when rubber supplies were cut off, but later switched to artificial rubber. At first rubber trees were good in South America, but by artificial transplantation, there are now many rubber trees in southeast Asia.
In fact, Asia has become the most important source of rubber. Rubber made from ginkgo gum can reduce sensitivity. Although more than half of rubber today is artificial, natural rubber is still very important in some fields, such as automobile and military industries.
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