Natural rubber is a chemical name is cis-1, 4-polyisoprene, that is, there are n isoprene (C5H8) have values ranging from 15-20000 because components of hydrocarbons that is not fair, Yang polarity, so the tires melt so well in solvent polarity, such as benzene, hexane, etc. In General, natural rubber has the structure of molecules, rearrange online morphology (amorphous), but in certain conditions, molecules of rubber can be sorted fairly organized at low temperatures or when requisitioned, it can get the recrystallization (crystallize) crystals occurs because low temperatures (low temperature crystallization) will cause the tires to improve.But if the temperature rises, the more it will weaken and tire back to original condition. While the recrystallization due to elongation (strain crystallization induced) causes the rubber is in good mechanical properties, that is, the tire will have a resistance to tensile strength (tensile strength) resistant to tear. (Tear resistance), and resistant to abrasion (abrasion resistance)
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