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Synthetic Rubber - Lab Report Example

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1. Natural rubber occurs as a milky emulsion or latex in the sap of a number of plants, but can be produced synthetically when units of Isoprene (a hydrocarbon diene monomer) are polymerised (Wikipedia, 2006) in the presence of a Ziegler Natta catalyst. Radical polymerisation occurs in three fundamental steps: initiation, propagation and termination…
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Synthetic Rubber
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Download file to see previous pages During polymerization the double bonds of the isoprene monomers give way to single bonds which will lead to further increase in length of product chain. Butyl rubber-also known as polyisobutylene (C4H8)-is a synthetic rubber and is produced by polymerization of about 98% of isobutylene with about 2% of isoprene (Wikipedia, 2006) using BF3, H2O, CH2CL2 as reaction activators under -78C temperature. e.g
Similarities and Differencies: In both natural and synthetic rubbers production, the monomers can be mixed in various desirable proportions to achieve a wider range of physical, mechanical, and chemical properties through the use additive. The formation of natural and synthetic rubbers are three step Free radical eliminations and substitutions reactions. Both Natural and synthetic rubber reactions require protectants against deterioration during the coagulation and drying (CIWMB).
2. In its natural form rubber is too soft to be used for any useful purposes.Natural rubbers tends to be sticky and soft at high temperatures; while at low temperatures they are brittle and stiff, making them difficult to process. This is due to a high degree of entropy. Therefore, its properties were improved using special processing techniques. During vulcanization, or curing, of rubber, individual polymer molecules are linked to other polymer molecules by polysulphide ...Download file to see next pagesRead More
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