Chemical Properties Of Rubber

Rubber s stress strain behavior exhibits the mullins effect and the payne effect and is often modeled as hyperelastic rubber strain crystallizes.

Chemical properties of rubber. Butadiene rubber synthetic rubber widely employed in tire treads for trucks and automobiles. Natural rubber is a polyterpene i e it consists of. Rubber rubber additives. Natural rubber styrene butadiene rubber polybutadiene rubber and butyl rubber.

A number of ingredients are added to both natural and synthetic rubber in order to obtain certain desirable properties. Elasticity occurs because the chains can be stretched and the crosslinks cause them to spring back when the stress is released. 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. A tire typically consists of four different kids of rubber.

Vulcanization or curing produces chemical links between the loosely coiled polymeric chains. 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. Rubber is bouncy sure but that s just the start of its numerous properties. To enhance the properties of rubber a process known as vulcanization is done.

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. Chemistry and properties all rubberlike materials. It s also tough tires resists water and chemicals gloves elastic rubber bands and much more. Approximately 40 to 60 percent of a tire is rubber.

Shore a is used for a soft to medium hard rubber. The modified hardness is then measured in terms of of durometer duro on a shore scale. Named for its property as an eraser to rub out pencil marks rubber is widely used. How it works states that during the vulcanization process rubber is treated with sulfur while being heated.

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. The chemical structure of the elastomers provides them with an inherent hardness that can be altered.