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Chapter 26: Q10P (page 1330)

Draw the structure of isotactic poly(acrylonitrile) and syndiotactic polystyrene.

Short Answer

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2)

Step by step solution

01

Structure of isotactic poly(acrylonitrile)

When all the CN groups are on the same side of a chain, this type of structure is called isotactic polt(acrylonitrile) structure.

General form:

Poly (acrylonitrile)

Isotactic:

02

Structure of syndotactic polystyrene

Syndotactic polystyrene contains regular alternate phenyl groups in the carbon chain.

General form:

Syndotactic

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Most popular questions from this chapter

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?

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.

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?

One of the earliest commercial plastics was BakeliteR, formed by the reaction of phenol with a little more than one equivalent of formaldehyde under acidic or basic conditions. Bayer first discovered this reaction in 1872, and practical methods for casting and molding. Bakelite were developed around 1909. Phenol-formaldehyde plastics and resins (also called phenolics) are highly cross-linked because each phenol ring has three sites (two ortho and one para) that can be linked by condensation with formaldehyde. Suggest a general structure for a phenol-formaldehyde resin, and propose a mechanism for its formation under acidic conditions. (Hint: Condensation of phenol with formaldehyde resembles the condensation of phenol with acetone, used in Problem 26-17, to make bisphenol A.)

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