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preface to fifteenth edition

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10.58 SECTION 10<br />

10.4 FORMULAS AND ADVANTAGES OF RUBBERS<br />

10.4.1 Gutta Percha<br />

Gutta percha is a natural polymer of isoprene (3-methyl-1,3-butadiene) in which the configuration<br />

around each double bond is trans. It is hard and horny and has the following formula:<br />

10.4.2 Natural Rubber<br />

Natural rubber is a polymer of isoprene in which the configuration around each double bond is cis<br />

(or Z):<br />

Its principal advantages are high resilience and good abrasion resistance.<br />

10.4.3 Chlorosulfonated Polyethylene<br />

Chlorosulfonated polyethylene is prepared as follows:<br />

Cross-linking, which can occur as a result of side reactions, causes an appreciable gel content in the<br />

final product.<br />

The polymer can be vulcanized <strong>to</strong> give a rubber with very good chemical (solvent) resistance,<br />

excellent resistance <strong>to</strong> aging and weathering, and good color retention in sunlight.

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