Question

what is vulcanisation of rubber??

Answer 1

Vulcanization or vulcanisation refers to a specific curing process of rubber involving high heat and the addition of sulfur or other equivalent curatives. It is a chemical process in whichpolymer molecules are linked to other polymer molecules by atomic bridges composed of sulfur atoms or carbon to carbon bonds. The end result is that the springy rubber molecules becomecross-linked to a greater or lesser extent. This makes the bulk material harder, much more durable and also more resistant to chemical attack. It also makes the surface of the material smoother and prevents it from sticking to metal or plastic chemical catalysts. This heavily cross-linked polymer has strong covalent bonds, with strong forces between the chains, and is therefore an insoluble and infusible, thermosetting polymer. The vulcanization process is a progressive reaction and is therefore allowed for a specified time. The process is named afterVulcan, Roman god of fire. A vast array of products are made with vulcanized rubber including ice hockey pucks, tires, shoe soles, hoses and many more. Hard vulcanized rubber is known asebonite or vulcanite and is used to make bowling balls and clarinet mouth pieces. Reason for vulcanizing Uncured natural rubber is sticky, can easily deform when warm, and is brittle when cold. In this state it cannot be used to make articles with a good level of elasticity. The reason for inelastic deformation of unvulcanized rubber can be found in its chemical nature: rubber is made of long polymer chains. These polymer chains can move independently relative to each other, which results in a change of shape. By the process of vulcanization, crosslinks are formed between the polymer chains so the chains can no longer move independently. As a result, when stress is applied the vulcanized rubber will deform, but upon release of the stress, the rubber article will go back to its original shape......................

Answer 2

→ Vulcanization ( also spelled as vulcaniaation ) is a process or more specifically a chemical process in which polymers are converted into a form which more durable than their initial form.

→ It is performed by creating crosslinks.

→ If we form cross links between each polymer chain, it also affects the mechanical properties of that particular element over which the vulcanization process is done.

→ It is quite often that we use the term " vulcanized fibre " by which we actually refer to a kind of cellulose that is in fact treated by a zinc chloride (  ) solution so that the cellulose fibres are crosslinked.

→ The vulcanization process in which sulphur is used to increase durability of rubber, is known as sulphur vulcanization( also spelled as sulphur vulcanisation ).

→ Sulphur volcanization is generally defined as the chemical process which involves conversion of the rubber formed naturally into a somewhat more durable matter by heating it with sulphur.

Originally answered by me on Brainly.in - https://brainly.in/question/5434172#readmore