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Chapter 26: Q13P (page 1334)

(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.

Short Answer

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a)

b)

Step by step solution

01

Introduction

Nomex庐 and Kevlar 庐 are Aramids or aromatic polyamide, a family of nylons. Their blends are used to make fireproof clothing. They are heat-resistant and have strong synthetic fibers.

02

(a) Nomex

Nomex庐 has meta-phenylene groups, in which the amide groups are attached to the phenyl ring at the 1 and 3 positions.

03

(b) Kelvar

Kevlar 庐 is a polyamide, in which all the amide groups are separated by para-phenylene groups, which means, the amide groups attach to the phenyl rings opposite to each other, at carbons 1 and 4.

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