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Chapter 26: Q2P (page 1326)

Propose a mechanism for reaction of the first three propylene units in the polymerization of propylene in the presence of benzoyl peroxide.

Short Answer

Expert verified

This type of polymerization results when a suitable alkene is heated with a radical initiator.

Step by step solution

01

Free-radical polymerization

This type of polymerization results when a suitable alkene is heated with a radical initiator.

02

Mechanism

In the initiation step, the initiator forms a radical that reacts with the monomer to start the chain.

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Most popular questions from this chapter

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?

Kodel® polyester is formed by transesterification of dimethyl terephthalate with 1,4-di(hydroxymethyl)cyclohexane. Draw the structure of Kodel.

Glyptal®resin makes a strong, solid polymer matrix for electronic parts. Glyptal is made from terephthalic acid and glycerol. Draw the structure of Glyptal and explain its remarkable strength and rigidity.

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.)

Polyoxymethylene (polyformaldehyde) is the tough, self-lubricating DelrinR plastic used in gear wheels.

(a) Give the structure of polyformaldehyde.

(b) Formaldehyde is polymerized using an acidic catalyst. Using H+ as a catalyst, propose a mechanism for the polymerization as far as the trimer.

(c) Is Delrin an addition polymer or a condensation polymer?
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