Manufacturing

Engineering with rubber : how to design rubber components by Alan N. Gent

By Alan N. Gent

This e-book presents the foundations of rubber technological know-how and technology:  what rubber is, the way it behaves, and the way to layout engineering parts with rubber. It introduces the principles on which winning use of rubber relies and provides recommendations to the questions engineers in rubber processing face on a daily basis. How is an elastomer chosen and a formulation built? Why is rubber hugely elastic and comparatively robust? How is the stiffness and strength of a product anticipated? How is high caliber and sturdiness assured? The authors describe present practices in rubber engineering. on the finish of every bankruptcy, there are pattern questions and difficulties (with recommendations) that gauge mastery of the fabric

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But some features of the behavior of rubber can be understood only in terms of its response to large deformations. We therefore need to know how to characterize the elastic behavior of highly extensible, nonlinearly-elastic materials. A simple modulus of elasticity is no longer sufficient. 3. Some important consequences of permitting the deformations to be large are also described. Finally, it should be noted that rubber compounds are usually “reinforced” by adding substantial amounts of a particulate filler, usually carbon black.

It has been proposed that the crosslinking occurs via allylic chlorines on the polymer molecules. Generally, mixtures of ZnO and MgO are used because ZnO by itself is too scorchy and MgO alone is inefficient. Butyl rubber cannot be cured with peroxides and sulfur vulcanization is often inefficient. Instead, polymethylol phenolic resins with metallic chlorides are often used. They give crosslinked materials with excellent resistance to high temperatures. 2 Reinforcement Particulate fillers can increase the strength of an amorphous rubber more than 10-fold.

Com by Universitätsbibliothek Bayreuth on February 21, 2012 For personal use only. It can be seen from this short survey that the rubber chemist has many options in designing the sulfur cure system for a particular application. Indeed, it is this ability to fine-tune curing characteristics as well as the final properties that makes sulfur the generally preferred vulcanizing agent. Its versatility allows the compound to be designed in a cost-effective manner for ease of manufacture as well as for obtaining the desired properties.

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