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Xiang Jun Grade: 12th pass
What is the purpose of vulcanisation of a styrene butadiene rubber (SBR)
2 years ago

Answers : (1)

askIITians Faculty
1246 Points
										vulcanization :convertion of natural rubberor relatedpolymersinto more durable materials via the addition ofsulfur.It is a type of cross-linking that changesrubberto the hard, durable material associated with car and biketires

When cross links are added to long rubber molecules, the flexibility decreases, the hardness increases and the melting point increases as well.

The number of sulfur atoms in the crosslink strongly influences the physical properties of the final rubber article.Short crosslinks give the rubber better heat resistance. Crosslinks with higher number of sulfur atoms give the rubber good dynamic properties but less heat resistance. Dynamic properties are important for flexing movements of the rubber article, e.g., the movement of a side-wall of a running tire. Without good flexing properties these movements rapidly form cracks and, ultimately, make the rubber article fail.
2 years ago
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