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P= (δ
0
- δ) / δ
0
•
100%
where δ
0
and δ - breaking strength of initial and irradiated samples, P - degree of radiation
damage. From the Figure 3.21 it is seen that HC-2 additive possesses light stabilizing effect at
irradiation by ultra-violet light with wave length 254 nm and 313 nm.
Figure 3.20. Dependence of breaking strength of initial and stabilized PETP - fibres on the time of
radiation exposure: a) - λ=254 nm, b) - λ=313 nm; 1 - initial PETP; 2 - PETP + 1% HC-2; 3 - PETP +
1% HC-1.
Samples, containing HC-1 additives, break at a greater rate in comparison with initial
samples, that shows sensibilizing action of HC-1 additive for irradiation by the light with
wave length 254 nm and 313 nm. For example, after being irradiated by ultra-violet light with
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