Chemical Properties Of Rubber

Shore a is used for a soft to medium hard rubber.

Chemical properties of rubber. Approximately 40 to 60 percent of a tire is rubber. Chemistry and properties all rubberlike materials. The modified hardness is then measured in terms of of durometer duro on a shore scale. It s also tough tires resists water and chemicals gloves elastic rubber bands and much more.

Vulcanization or curing produces chemical links between the loosely coiled polymeric chains. The article explains these properties of rubber in detail. A number of ingredients are added to both natural and synthetic rubber in order to obtain certain desirable properties. About 55 percent of a tire s rubber content is in the sidewall and tread and companies use natural styrene butadiene and.

It consists of polybutadiene an elastomer elastic polymer built up by chemically linking multiple molecules of butadiene to form giant molecules or polymers the polymer is noted for its high resistance to abrasion low heat buildup and resistance to cracking. Rubber exhibits unique physical and chemical properties. By convention mix formulations begin with the amount of the designated elastomer for instance natural rubber nr butadiene rubber br or styrene butadiene rubber sbr given as 100 parts by weight. Natural rubber styrene butadiene rubber polybutadiene rubber and butyl rubber.

Rubber is bouncy sure but that s just the start of its numerous properties. How it works states that during the vulcanization process rubber is treated with sulfur while being heated. To enhance the properties of rubber a process known as vulcanization is done. Natural rubber is a polyterpene i e it consists of.

Rubber rubber additives. Elasticity occurs because the chains can be stretched and the crosslinks cause them to spring back when the stress is released. Rubber s stress strain behavior exhibits the mullins effect and the payne effect and is often modeled as hyperelastic rubber strain crystallizes. The sulfur is important to the process because it enhances the rubber s elasticity and resistance to the damaging effects of higher or lower temperatures.

Due to the presence of weakened allylic c h bonds in each repeat unit natural rubber is susceptible to vulcanisation as well as being sensitive to ozone cracking. A tire typically consists of four different kids of rubber.