High Performance Polymers, 2nd Edition

44 HIGH PERFORMANCE POLYMERS

CH

3

H

3

C

p-Xylene

α,α,α′,α′-Tetrafluoro-p-xylylene

CC

F

F

F

F

HH

[2,2]Paracyclophane

CH

2

H

2

C

H

2

C

CH

2

Octafluoro-[2,2]paracyclophane

CF

2

F

2

C

F

2

C

CF

2

3-(5-Phenylpentyl)-4-methylbenzyl chloride

CH

3

ClH

2

C

(CH

2

)

5

CH

2

H

2

COO

1,4-Bis(phenoxymethyl)benzene

Figure 2.1 Monomers used for PPX.

260–280

◦

C. To prevent gelation, the reaction is con-

ducted in a solvent such as sulfolane. A quaternary

phosphonium salt is added as a phase transfer catalyst.

A lower temperature of 160

◦

C is applied. However,

the reaction time increases up to 48 h.

Octafluoro[2.2]paracyclophane is prepared by

refluxing tetrahydrofuran (THF) and hexamethylphos-

phoramide or DMSO solution