New highly phenylated bis(phthalic) and bis(naphthalic) anhydrides and polyimides therefrom - Polyimides and Other High Temperature Polymers - page 109

Table 7.
Photoabsorption and fluorescent characteristics of phenylated PNIs VIA-VIG

Polymer

a max , nm f max , nm

Relative quantum yield

λ λ

408 550 6.1

A

B 400 540 3.8

C 410 530 5.6

D ∗

431 580 1.0

E 415 510, 548 7.3

F 421 510, 550 7.3

G 399 510 4.1

∗ The quantum yield of polymer VID is taken to be 1.0

a

VIA-VIG max are in the 399-431 nm

range (films). All the phenylated PNIs display similar fluorescent profiles with
λ

polymers. Their UV absorption maxima λ

f

max in the region of 510-580 nm (a yellow emission) at the excitation wave-
length of 400 nm. Relative quantum yields of these polymers vary from 1 to 7.3
(the quantum yield of VID is taken as unity). In the case of polymers VIE and

VIF (it appears

that the regular structure of a polymer chain plays an important role in fluores-
cence).

, the fluorescence is 7.3 times stronger than that for polymer VID

4. CONCLUSION

New highly phenylated polyimides and poly(naphthalimide)s were prepared via
the reaction of aromatic diamines with previously undescribed phenylated aro-
matic tetracarboxylic acid dianhydrides. All polyimides prepared showed excel-
lent solubility in organic solvents combined with promising thermal, mechanical,
electrical and optical properties.

Acknowledgement
This work was supported, in part, by the Civilian Research and Development
Foundation (USA) under grant no. RC2-2203.

REFERENCES

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Leningrad (1968).
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polimerov (Polyimides - A Class of Thermally Stable Polymers) , p. 238, Nauka, Leningrad
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