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Table 6 Rate constants/k of photodegradation and half life times of
doped PBT dye and manganese(II) complex in PMMA
Sample
k/min-1
t /min
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PBT/PMMA
385 nm
9.31 9 10-4
385 nm
744
PBT/MnII complex/PMMA
382 nm
2.18 9 10-4
382 nm
3179
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complexation, the Mn(II)/PBT enhance the photostability.
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between dye with metal ions. The rate constant of photo-
degradation of dyes was estimated according to the fol-
lowing equation [55, 56]:
2:303
A0
A
k ¼
log
t
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Acknowledgements The author wishes to express many thanks for
the Prof. Ivo Grabchev, Institute of Polymers, Bulgarian Academy
of Sciences, Sofia 1113, Bulgaria, for his assistant for supported to
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