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Chapter 26: Q12P (page 1333)

(a) Isobutylene and isoprene coplymerize to give “butyl rubber”. Draw the structure of the repeating unit in butyl rubber, assuming that the two monomers alternate.

(b) Styrene and butadiene copolymerize to form styrene-butadiene rubber (SBR) for automobile tires. Draw the structure of the repeating unit in SBR, assuming that the two monomers alternate.

Short Answer

Expert verified

Copolymerisation reaction is the reaction in which more than one monomer polymerise to form a copolymer. The properties of the resulting copolymer will be different from the parent homopolymer. Cationic copolymerization of isobutylene and isoprene produces butyl rubber, an elastomer which is of commercial importance.

Step by step solution

01

Step-1. Copolymerisation of isobutylene and isoprene:

Copolymerisation reaction is the reaction in which more than one monomer polymerise to form a copolymer. The properties of the resulting copolymer will be different from the parent homopolymer. Cationic copolymerization of isobutylene and isoprene produces butyl rubber, an elastomer which is of commercial importance.

02

Step-2. Copolymerisation of styrene and butadiene:

Styrene-butadiene copolymer is synthetic rubber and prepared by polymerisation of styrene and butadiene monomers. SBR has good stability and abrasion resistance.

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Most popular questions from this chapter

Chain branching is not as common with anionic polymerization as it is with free-radical polymerization and cationic polymerization.

  1. Propose a mechanism for chain branching in the polymerization of acrylonitrile.
  2. Compare the relative stabilities of the intermediates in this mechanism with those you drew for chain branching in the cationic polymerization of styrene (Problem 26-6). Explain why chain branching is less common in this anionic polymerization.

Give a mechanism, using Figure 26-1 as a guide, showing chain branching during the free-radical polymerization of styrene. There are two types of aliphatic hydrogens in the polystyrene chain. Which type is more likely to be abstracted?

Bisphenol A is made on a large scale by a condensation of phenol with acetone. Suggest an appropriate catalyst, and propose a mechanism for this reaction. (Hint: This is a condensation because three molecules are joined with loss of water. The mechanism belongs to another class of reactions though.)

Polychloroprene, commonly known as neoprene, is widely used in wetsuits and in rubber parts that must withstand exposure to gasoline or other solvents.

(a) Is neoprene an addition polymer or a condensation polymer?

(b) What monomer is used to make this synthetic rubber?

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