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rubber technology
Rubber Technology is the subject dealing with the transformation of rubbers or elastomers into useful products, such as automobile tires and rubber mats. The materials includes latex, natural rubber, synthetic rubber and other polymeric materials, such as thermoplastic elastomers.〔(【引用サイトリンク】url=http://www.industrialrubbergoods.com/types-of-rubber.html )〕 Rubber processed through such methods are components of a wide range of items.
==Vulcanization==
Most rubber products are vulcanized, a process which involves heating with a small quantity of sulphur (or equivalent cross-linking agent) so as to stabilise the polymer chains, over a wide range of temperature. This discovery was made by Charles Goodyear in the 1844, but is a process restricted to polymer chains having a Double bond in the backbone.〔(【引用サイトリンク】url=http://www.wisegeek.org/what-is-vulcanized-rubber.htm )〕 Such materials include natural rubber and polybutadiene. The range of materials available is much wider however, since all polymers become elastomeric above their Glass transition temperature. However, the elastomeric state is unstable because chains can slip past one another resulting in creep or stress relaxation under static or dynamic load conditions. Chemical cross links add the stability to the network that is needed for most practical applications.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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