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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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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

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.

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.)

(a) Isobutylene and isoprene coplymerize to give 鈥渂utyl rubber鈥�. 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.

(a) Nomex庐, a strong fire-resistant fabric, is a polyamide made from meta-phthalic acid and meta-diaminobenzene. Draw the structure of Nomex.

(b) Kevlar庐, made from terephthalic acid (para-phthalic acid) and para-diaminobenzene, is used in making tire cord and bulletproof vests. Draw the structure of Kevlar.

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