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Chapter 26: Q11P (page 1332)

. (a) Draw the structure of gutta-percha, a natural rubber with all its double bonds in the trans configuration.

(b) Suggest why gutta-percha is not very elastic, even after it is vulcanized.

Short Answer

Expert verified

b)Due to more trans double bonds in gutta-percha, there occurs higher degree of crystallinity and lesser elasticity.

Step by step solution

01

Step-1. Structure of gutta-percha:

Gutta-percha is a natural polymer and is same as natural rubber with respect to its chemical properties. It is trans-polyisoprene and has all trans double bonds. On heating, it becomes plastic and is resistant to water.

Gutta-percha

All double bonds are trans

02

Step-2. Reason for low elasticity of gutta-percha:

Trans double bonds in gutta-percha allows for more ordered packing of the chains. Due to the ordered packing of the chains, there exists higher degree of crystallinity and less elasticity in gutta-percha. More crystalline the polymer, less elastic will it be.

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